Brief Description of the Set-Up and Activities of the Power and Telecommunication Coordination Committee (ptcc)

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Appendix XIII to Chapter 1

(Refer Paras 6.9.3 and 6.9.7)

  1. Copy of Director (RD), Department of Telecommunications, New Delhi

Letter No. 131-13/81-tpl (tx) dated 18.7.1981.

Shri V.V. Rao

Chief Engineer (PS)

Ministry of Energy

Department of Power

West Block No.2, R.K. Puram

New Delhi 110022.
Subject: Sharing of cost for re-engineering scheme between State Electricity Boards/ C.E.A./ other Undertakings dealing with construction and / or operation of power lines and P&T Department.
With reference to your letter No. 19/96086-PTCC dated 17th April 1980, on the subject, conveying your concurrence to our proposals, I am to intimate you that the P&T Board, in meeting no. 3 of 1981-82 held on 15th June 1981, has approved the following proposals:

  1. In cases in which the telecommunication circuits are required to be protected by installation of GD tubes, shifting/re-routing of open wire lines, substitution in part with underground cable pairs, the cost of protective measures may be borne by the later entrant in the field as per the practice being following at present.

  1. In cases where it becomes necessary to remove the open wire lines altogether and provide circuits on other media like underground symmetrical cable, coaxial cables/microwave, UHF or other radio systems, the Electricity authority shall pay the 2/3rd portion of costs of such protective measures, and P&T shall bear 1/3rd portion of the cost.

  1. Past cases will not be re-opened.

  1. This is for your information and further necessary action.



Director (RD)

Copy to:

  1. Shri N. V. Krishnaswami, Director Telecom, C.E.A., B6-7/19, DDA Shopping Center, Safdarjung Enclave, New Delhi 110016.

II. Copy of ADG (ML), Department of Telecommunications, New Delhi Letter No.10-11/92-ML dated 25th May 1992
Subject: Minutes of the meeting held between Department of Telecommunications and Department of Power on re-engineering on 4th May 1992 at 14.30 Hours in Committee Room, Sanchar Bhavan.
Kindly find enclosed herewith minutes of the above meeting for your kind information and necessary action.


Minutes of the meeting held in the Committee Room in Sanchar Bhavan, New Delhi at 14.30 hours on 4th May 1992 between Department of Telecommunications and Department of Power (Central Electricity Authority) on re-engineering cost towards affected telecom circuits/lines.
A meeting was held between the representatives of Central Electricity Authority, New Delhi and Department of Telecommunications, New Delhi on the representation of the Power sector for reviewing the sharing formula for the re-engineering cost of the affected Telecom circuits/lines. The following participated in the meeting:
DOT Side C.E.A Side
S/Shri S/Shri

(1) D.B. Sehgal, DDG (ML) (1) D.P. Sinha, CE (LD&T), C.E.A

(2) N.C. Gupta, DDG (RN) (2) D.M.Rao, Director PTCC

(3) D.Swaminathan, Director (ML) (3) Harish C.Arora, Dy. Director

(4) Ms. Rune Ghosh, Director (FAI) (4) Neeraja Mathur, Dy. Dir.

(5) B.C. Bhat, ADG (F-I) (5) Ram Swarup, Dy. Dir.

  1. D.K. Malik, Asstt. Dir.

Shri D.B. Sehgal, DDG (ML) welcomed all the participants and requested Shri D.P. Sinha, Chief Engineer, Central Electricity Authority to give brief on the need for re-examination of the sharing of re-engineering costs, Shri Sinha, CE, Central Electricity Authority outlined how the sharing formula between the Power sector and the Telecom sector towards re-engineering charges was evolved. In earlier times, the technology available for replacement was generally by like by like systems; therefore, the entire cost of re-engineering was borne by the later entrant due to whom re-engineering was necessitated. Subsequently, as technology improvement resulted in induction of new types of equipments in place of the existing open wire lines, a steady increase in the re-engineering cost was observed. On the representation of the Power sector, the issue was examined in detail by DOT and the Power sector authorities in 1981 and a decision was taken that the total cost of re-engineering will be borne in the ratio of 2:1 by the Power Sector and DOT. Further, due to induction of the latest technologies like digital microwave systems and optical fibre systems, the Power sector feels that the re-engineering cost has shot-up tremendously and in certain cases even exceeded the cost of the new power line. It has also been observed by the Power Sector that while re-engineering DOT is providing large capacity systems in place of open wire lines having 3/8/12 channel systems. The additional capacity is being used by DOT for meeting its future growth requirements and thus, the Power sector is being made to bear the developmental cost of DOT plans. He requested DOT to reconsider the whole issue on the lines suggested by the Power sector i.e. Power sector may pay prorata cost in the ratio of the system capacity of the old system vis-à-vis the total capacity of the new system.

DDG (ML) while appreciating the concern of the Power sector made it amply clear to them that they should not just look at the re-engineering estimate presented by DOT in isolation. They should appreciate that had the Power sector erected the alignment in a different route thereby avoiding the necessity for re-engineering the extra cost that would have been involved should also form a factor in deciding the cost of the re-engineering estimate presented by DOT. He emphasized that it was not always possible to replace by open wire line by a radio/cable system of exactly the same capacity. We should find out the best and the most economical technical solution and having capacity as close to the system to be replaced as possible. The cost of this system should be born fully (100%) by concerned Electricity Authority. However, if DOT combines its future requirements and wants to install a system of much higher capacity, Power sector may pay the notional cost of replacement by the nearest possible technically suitable system. He in fact drew the attention of the Power sector to the railway electrification work wherein also large scale re-engineering was involved. He pointed out that the Railways bear 100% re-engineering charges and in addition permit DOT to make use of the excess capacity on the medium wherever available for which no compensation need to be paid to the Railways.
DDG (RN) pointed out that the present sharing formula was arrived at after detailed consideration by both the Telecom and Power sectors including drawing parallels from other telecom administrations. There may be a few exceptional cases where the opinion of the two organizations may differ with regard to the best solution. Such cases can be considered by Standing Committee consisting of officers from both DOT and Power sector for which already instructions exist. Instead of resorting to the above mechanism to solve the problem it should not be our endeavor to re-open the issue of the sharing formula for the re-engineering cost, which was arrived at after careful consideration by both the parties.
The Chief Engineer, CEA agreed with the above suggestions and proposed that the Central Standing Committee should be revived immediately so that it could look into such estimates, which have resulted in this situation. He once again reiterated that this issue is to be resolved expeditiously before the next Central PTCC meeting, which is likely to be held in the month of June/July, 1992. It was decided that the Central standing Committee will consist of two representatives from DOT and Two from CEA, Director (ML), DOT will be convener of the Committee.
Appendix XIV to Chapter 1

(Refer Para 6.9.8)
Government of India

Ministry of Communication

Telecom Commission

(ML Section)
No. 10-11/94-ML New Delhi the 30th January 1995.

  1. All Chief General Managers, Telecom Circles

  2. The Chief General Manager Maintenance, New Delhi/Mumbai/Kolkata/Chennai

  3. The Chief General Manager, T&D Circle, Jabalpur

  4. All Chief General Managers, Telecom Projects

  5. The Chief General Manager, Task Force, Guwahati/Shimla.

Subject: Methodology for obtaining payment of re-engineering charges from

Department of Power towards affected telecom circuits/lines.
The question of obtaining the re-engineering charges from Department of Power has been under consideration for sometime in this office. It has now been decided, in consultation with the CEA that the following criteria will have to be adopted while claiming re-engineering charges from the Department of Power.
2. To protect affected DOT systems working on overhead alignment due to induction from power lines, the following procedures are adopted:

  1. Protection through GD tubes without shifting alignment;

  2. Shifting/re-routing of existing alignment with or without GD tubes;

  3. Substitution in part with underground cable pairs; and

  4. In case where it becomes necessary to remove the open wire lines altogether, the existing system may be replaced by other viable system.

In the first, instance, efforts should be made strictly in the order given above. If none of them are viable, then action may be initiated for replacement by nearest technically feasible small capacity system.

(i) In case from 2 (i) to 2 (iii) above the existing procedure for re-engineering charges will be continued between DOT & Department of Power (as is being followed presently)
(ii) In case of 2 (iv) above if the nearest equivalent capacity system is installed in place of the existing system, the following least cost technically viable options will be adopted.

  1. In case of replacement by narrow band radio system (VHF/UHF) limited to 6/10 channels as the nearest technically feasible small capacity systems, 100% of the cost of Equipment+100% of the cost of the Tower or Mast as the case may be +25% enhanced charges on the cost of Equipment & Tower or Mast as the case may be (to cover transportation, installation, establishment, land, building, A/C plant, motor vehicles, testing etc) will have to be charged from Power Utility.

  1. In case of narrow band radio systems (UHF) limited to 30 channels as the nearest technically feasible small capacity systems, 66% (2/3rd) of the cost of the Equipment, +66% (2/3rd) of the cost of the Tower or Mast as the case may +25% enhanced charges on the cost of Equipment & Tower or Mast as the case may be (to cover transportation, installation, establishment, land, building, A/C plant, motor vehicles, testing etc) will have to be charged from Power Utility.

  1. In case of replacement by PCM cable system under re-engineering work, 66% (2/3rd) of the cost of the equipment and cable + 50% enhanced charges (to cover transportation, cable laying, tools, testing etc) will have to be charged from Power Utility.

  1. In case, if DOT wants to utilize the higher capacity system for future development in telecom networks, such as optical fibre cable systems, 2 GHz M/W system etc, the notional cost of the technically feasible system as mentioned in Para 3 (ii) (a) (b) and (c) above, whichever will be lower, will be charged from Power Utility and DOT will be free to plan any higher system as per its requirement.

  1. Estimates once accepted and paid for, will not be revised.

  1. When the amount of payment towards re-engineering charges is equal to or less then Rs. 50 lakhs, the mode of payment will be as per Para 1 (I to iv) of the enclosed Annexure as applicable and the entire amount to be paid in one installment only.

  1. When the amount involved is more than Rs. 50 lakhs the mode of payment will be as per separate notification modifying the previous reference no. 130-12/86-TPL(TX) dated7.7.1987 (as per Annexure).

This issues with the concurrence of Internal Finance vide their Diary No. 178/95-FA-I dated 20.1.1995. This supersedes all the orders issued in this regard earlier. This will be effective from the date of issues of orders.


(D. Swaminathan)

Director (ML)

Copy to:

  1. All DDGs, Telecom Commission, New Delhi.

  2. Shri D.P.Sinha, CE (LD&T), CEA, Sewa Bhawan, RK Puram, New Delhi.

  3. Director (FA-I), Telecom Commission, New Delhi.

  4. Guard File.

No. 10-11/94-ML Dated at New Delhi, 30th January 1995.

  1. All Chief General Manager, Telecom Circles

  2. All Chief General Managers, Maintenance

  3. The Chief General Manager, T&D Circle, Jabalpur

  4. All Chief General Manager, Telecom Projects

  5. The Chief General Manager, Task Force, Guwahati/Shimla

Previous Reference: 130-12/86-TPL (TX) dated 7.7.1987 amended as below:

1. In partial modification to the order already issued on the above subject, the following alternatives are suggested by which the payment can be made to DOT in all such re-engineering cases.

  1. Cash payment

  2. By Demand draft.

  3. By Cheque if the payment is made by Government agency like Department of Power, Public Sector Undertaking like NTPC etc.

  4. In case of Electricity authorities/State Electricity Boards, the payment mode can be either as per (i) and (ii) above or through a nationalized bank under irrevocable letter of credit in favor of Department of Telecom for relevant installment.

2. The authorization in such case to pay the amount in four phases as suggested in the earlier circular mentioned above holds good namely.

  1. 25% of the estimated cost to be released initially as first installment.

  1. Next 35% should be released as second installment as soon as the equipment is ordered.

  1. Next 30% should be released as third installment after the supplies are affected and erection starts.

  1. Balance 10% should be released during erection, commissioning.

3. It is requested that all the pending cases may also be reviewed in the light of the above-mentioned decisions and settled expeditiously, where the Electricity Department wants to make payment in installments. The cases already settled are not to be re-opened.



Director (ML)
Appendix XV to Chapter 1

(Refer Para 6.10.4)
State Level Power and Telecommunication Co-ordination Committee
Government of India

Central Electricity Authority

Power Communication Engineering Division

NREB Complex, Katwaria Sarai

New Delhi 110016.
No. PCE/1/2001-PTCC/334 – 66 Dated: 20th March, 2001

CEs (Transmission), SEBs

Sub: Membership of the Re-constituted State Level PTCC

In pursuance of the decision taken in the 75th Central PTCC meeting held at Bangalore on 9th November, 2000 the membership of the SLPTCC has been modified. The Ministry of Power have conveyed their approval vide letter No. 3/1/2001-Trans. Dt. 14th March, 2001 for the revision of the membership of the newly constituted SLPTCC as detailed below:

  1. GM (Telecom) of concerned Telecom Circle, BSNL Chairman in alternate


  1. Chief Engineer (Transmission) of the concerned

SEBs/ State Power Transmission Corporations

  1. DGM (Telecom) who deals with PTCC Secretary (SLPTCC)

matters of the T elecom Circle Telecom Sector

  1. SE/DGM, who deals with PTCC matters of Secretary (SLPTCC

the State Power Utility) Power Sector


  1. EE of Power Utility / SDE (PTCC), T & D Circle BSNL - Co-ordination


  1. Other members from Power Sector:

    1. Zonal SE/ EE in-charge of PTCC

    2. Representative from any other Central/ State Power Trans. Corporation

    3. Chief Electrical Inspector or his authorized representative from state

  1. Other Members from BSNL

    1. AGM (Plg) in charge of PTCC, BSNL

    2. DET (PTCC), BSNL of the concerned region

    3. Any other representative of BSNL as special invitee, as required.

  1. DSTE of Zonal Railway

  2. Army representative of the Area

You are therefore requested to revise the nominations of your officers to SLPTCC in accordance with the above constitution and communicate the same to all concerned.

The brief functions of the SLPTCC are annexed.
Yours faithfully,


(Ram Swarup)

Director (PTCC)

Tel. No. 6565183

Copy forwarded for information to:
Chief General manager, T & D Circle, Bharat Sanchar Nigam Limited, Sanchar Vikas Bhawan, Residency Road, Jabalpur, 482001 with a request that a similar notification may please be issued at your end to all the CGM of Telecom Circle of BSNL.


(Ram Swarup)

Director (PTCC)

Tel. No. 6565183

II. Frequency
As per the decision taken in 58th Central PTCC meeting held at Darjeeling on 25.2.1992 the State Level PTCC meetings should be held as frequently as possible but not later than a quarter/3 months. In Telecom Circles where large number of unguarded power crossings are pending and more electrocution accidents occurred, the meetings in those circles should be convened more frequently In order to decide any emergency cases, special State Level PTCC meetings can also be requisitioned and the power of requisition of such meetings is vested with Chairman State Level PTCC.
III. Functions
As per decision taken in 58th Central PTCC meeting held at Darjeeling on 25th February 1993 in addition to the present business or transaction, following items must be deliberated on regular basis in State Level PTCC meetings, with all participants participating at desired level.

  1. Position of unguarded power crossings, including LT crossings and non-standard electric service leads should be discussed in every meeting as to how many were added, how many rectified and a continuous monitoring is done and further targets fixed for rectification.

  1. All the PTCC cases both at State and Central level, which are delayed beyond the fixed time limits specified in PTCC manual must be discussed, reasons for delay analyzed and targets fixed case by case.

  1. All re-engineering cases must be discussed deliberating on all possible reasonable schemes based on existing guidelines and decisions taken. In case of any disagreement by any party, same should be recorded and in the form of any agenda item the case should be sent to Central PTCC with all details of enabling Central PTCC to take further decision in the mater.

  1. All cases of payment of costs, completion of protection works and energization approval must be discussed and targets fixed and continuous monitoring is done.

  1. Matters concerning Railways should be recorded and intimated to Railways with a copy to Director (Telecom), Railway Board, New Delhi.

  1. All fatal and non-fatal accident cases should be discussed in the meetings and based on reports the responsibility should be fixed and the implementation of remedial measures monitored to avoid recurrence of accidents.

Appendix XVI to Chapter 1

(Refer Para 6.11.2)
A meeting was held in the P&T Board room on 10-12-1976 to discuss problems relating to protection of Railway Telecom and Block Circuits consequent to induction from power lines. The following were present
P&T Board

Shri S.N. Ranganathan Member (TD)

Shri H.J. Mirchandani Member (TO)

Shri P.A. Sankarnarayan GM, T&D Circle, Jabalpur

Shri T.S. Subramanian Director (TRC)

Shri M.N. Mathur DDG (ML)

Shri T.V. Srirangan Addl. Director (TRC)

Shri B.N. Iyenagar Dy. Director (TRC)

Shri B.R. Baliga Asstt Director (TRC)

Shri S.S. Murthy Member (Power Systems)

Shri N.V. Krishnaswamy Jt. Secretary (Power), PTCC
Railway Board

Shri Laljee Singh Director (Signal)

Shri A.K. Das Jt. Director (Telecom)
2. Opening the discussion Shri Laljee Singh of Railway Board mentioned that Railways presently are having circuits leased from P&T as well as owned by the Railways themselves. He mentioned that though in 1955-56 the PTCC had decided on a limit of 430 V induction in respect of railway block circuits and a representative from Railways was also present when the decision was taken, considerably further development has taken place and it is now found that the railway block circuits are getting affected by such induced voltages. In this connection, he gave details about the different types of block instruments being used by the Railways. While some of these instruments do not get affected by induced voltages up to 430V other types are not so. These instruments are still capable of giving further service. Shri Laljee Singh stated that Railways are going in for standardization of the block instruments and will be providing as far as possible only those, which are capable of withstanding 430V AC induction for the future installations. However, in respect of existing block circuits conversion of earth return circuits and replacement/modification of instruments have become necessary as a result of these induced voltages.
He gave instance of 19 cases in which the Railways had computed additional expenditure, recurring as well as non-recurring for the extra protection required in the block circuits over and above the stipulation given in PTCC approval. While in most of these cases the cost ranges from about Rs. 170 to about Rs. 69,000, there was one case where the expenditure was estimated at Rs. 1.53 lakhs non-recurring and Rs. 322 recurring. Shri Laljee Singh mentioned that the PTCC should take note of these and incorporate adequate protective measures in respect of railway block circuits while giving route approvals.
3. Shri Laljee Singh had a doubt whether the PTCC before giving clearance gets all the information regarding the railway alignments specially those operated by Railways. It was clarified by Joint Secretary (Power) that this information is obtained by the PTCC Secretaries and the line drawings also go to Railways directly. This arrangement was considered satisfactory.
As far as the telecom circuits used by Railways on alignments either rented out from the P&T or owned by them the present protective measures as recommended in PTCC clearance is satisfactory, only the cost of such measures are to be borne by the later entrant. It was also clarified that the Joint Secretary Telecom of the PTCC is at present looking after all the telecom circuits, which are disturbed as a result of power induction. The main problem was that the block circuits are presently being considered as equivalent to telecom lines and only the protective measures for the telecom lines are prescribed for the block circuits also. However, the block circuits in many cases cannot withstand the voltages, which are being prescribed for the telecom lines. While the PTCC gives clearance for block circuits, it is necessary to ensure that the protective measures to be additionally provided on the block circuits are also specified, in consultation with Railway Board. It is not clear in the clearance given by the PTCC as to who will fit in the additional protective measures and who will bear the cost. The additional cost which the Railways will have to bear on a number of routes already cleared by the PTCC was also submitted during the discussion and it was found that in most cases it was a few thousands of rupees. Taking all these facts into consideration the following principles were decided for future clearance in respect of railway circuits.
4. (i) For new railway lines, Railways will provide, as far as possible block instruments, which can stand the voltages permissible for telecom lines. Initially from considerations of economy, they provide only earth return circuits which have to be changed to metallic return circuits if and when power parallelism problem arises.
(ii) The present practice in regard to issue of PTCC clearance for communication circuits may be continued and the protective measures for the railway communication circuits may be similar to those prescribed by the P&T for their own communication circuits. Cost of such measures is to be borne by later entrant.
(iii) Wherever the railway electrification has been carried out, the paralleling railway circuits (including block circuits) can be cleared as for telecom lines without additional protective measures being prescribed for the block circuits subject to the condition that the induced voltage does not exceed 430V. In case the induced voltage exceeds 430V, case has to be coordinated and discussed with Railway Board for a decision.
(iv) For existing alignments which are also carrying block circuits, the PTCC clearance will be given along with the additional protective measures as recommended by the Railway Board required for the block circuits and the cost for the same is to be borne by the later entrant i.e. the Electricity authorities. Approximately one time capital cost to be borne by the later entrant will be intimated to PTCC later if required.

  1. Shri Krishnaswamy of the CEA pointed out that this procedure of incorporating the additional protective measures prepared for block circuits might increase the time delay in giving route approvals. Shri A.K. Das promised that a time limit can be given for obtaining information and Railways would adhere to this time limit.

5. Of late many cases are arising wherein the normal protective measures like re-routing the telecom or power lines or mitigating induction by GD tubes are not sufficient. In such cases re-engineering of the telecom circuits by media other than open wire lines has to be resorted to. There is no clear procedure uptil now as to how the re-engineering proposal will be framed and finally accepted by the Telecom and Power authorities. DDG (ML) stated that this has been discussed internally in the Telecom Directorate and the proposed new procedure is as follows.

As soon as it is established that re-engineering is required, the PTCC will call for a meeting of the concerned GMsP, GMsM and Circle GM and GM T&D Circle and a representative from the Power authorities. Whenever railway circuits are involved concerned Railway representatives will also be called for attending the meeting. In this meeting the probable solution will be discussed and the GMsP/Railway representative will be asked to prepare the re-engineering proposals with alternatives and approximate cost. The proposal would be framed within a specified time frame and would be sent to DDG (ML) in P&T Directorate and also to power authorities and to Railway Board. The time frame for framing the proposal will be decided in this meeting itself depending upon the urgency and other factors. This will be examined in the Directorate and Railway Board along with the time frame for implementation of the proposals and forwarded to the Power authorities for acceptance. This procedure should be tried out henceforth. After the appropriate re-engineering proposals are finalized, the formal clearance will be given by the PTCC.
6. The present cases of re-engineering are often becoming quite difficult to decide and implement because the cases are generally referred to DG P&T at an advanced stage. Member (D) requested all concerned that proposal should come to PTCC at the survey stage itself so as to provide adequate time for examination, re-engineering and implementation.

NO.10-23/72-ML Vol. II (Part I) dated at New Delhi April 1977, Copy forwarded to all concerned.


(N.C. Gupta)

Asstt. Director General (ML)
NOTE: With reference to the procedure for finalizing the re-engineering schemes in Para 5 above Director (RD), DOT, New Delhi vide his DO 130-12-85-TPL (TX) dated 10th October 1985 addressed to DGM, T&D Circle, Jabalpur clarified that in order to curtail the delay, the new re-engineering schemes may also be finalized by telecom Circles in consultation with Telecom Projects and concerned Power authorities and on the basis of estimated cost, re-engineering charges may be claimed from concerned Power authorities

Appendix XVII to Chapter 1

(Refer Para 6.11.4)
Government of India (Bharat Sarkar)

Ministry of Railway (Rail Mantralaya)

(Railway Board)
No.77/W3/TCM/2/Meeting New Delhi, dated 3rd April 1978
The General Manager (S&T)

All Indian Railways

Subject: PTCC route approval for Power Lines up to and including 132 KV lines.
At present the power lines up to 33 KV are being dealt with at the State Level PTCC but it has been decided now that henceforth all cases of route approval right up to 132 KV (inclusive) will be decentralized with effect from 1st June 1978. In other words, General Manager (S&T), Railways, will have to deal with these cases up to and inclusive 132 KV instead of Railway Board. The procedure will be as follows (to be effective from 1st June 1978).
The route map in 4 copies will be sent from the State Electricity Board authorities to the concerned Railways who will have to furnish the telecom details to the State Level Power Member. The later will calculate the induced voltage on the affected block and telecom circuits and send the same to the Railway authorities. The Railways authorities in turn will have to examine and furnish the recommendations for protective measures on railway block circuits (in the same way as the Railway Board furnishes the same with a copy to the Railways) to the following:

  1. For cases up to 33 KV to AE PTCC of the State;

  1. For cases beyond 33 KV up to 132 KV (inclusive) to:

  1. Joint Secretary (Telecom), PTCC, Room No.478 Khurshid Lal Bhawan, New Delhi-110001 for Northern Region cases;

  1. Divisional Engineer Telegraphs, PTCC, O/o General Manager Telecom Maharashtra Circle, GPO Building, Walchand Hirachand Marg, Fort, Mumbai-400001 for Western Region cases;

  1. Division Engineer Telegraphs, PTCC, O/o General Manager Telecom, Eastern Region, Taher Mansion, 5th Floor, B-Bentick Street, Kolkata- 700001 for Eastern Region cases; and

  1. Division Engineer, Telegraphs, PTCC, Southern Region, 100/101, Walajah Road, Chennai-600002 for Southern Region cases.

who will issue route clearance incorporating the Railway’s recommendations of protective measures to be provided by Railway/P&T. As for the protective measures on railway communication circuits whether owned or maintained by Railways or P&T, the standards followed by P&T will be adopted for railway, telecom circuits as well. Protective measures on railway telecom circuits on that basis will be incorporated by Joint Secretary (Telecom)/DET PTCCs in the route approval. The cost of all the protective measures will be borne by the later entrant in the field.

A copy of the recommendations for protective measures on railway block circuits is also enclosed herewith for the guidance of Railways.
For re-engineering and any other complicated cases, the matter may be referred to or discussed with Joint Director, Telecom (G), Railway Board. The target for furnishing the telecom details etc. should continue to be the same as is prevalent at present i.e.

  1. The telecom details should be furnished to Member (Power) State Level PTCC within one month from the date of receipt of route maps from State Electricity Board.

  1. The recommendations for protective measures should be furnished within 10 days from the date of receipt of calculated induced voltage from the Member (Power), State Level PTCC;

  1. The estimate for the cost (to be paid by the State Electricity Board authorities) should be sent to State Electricity Board within one month from the date the route clearance from PTCC, is received; and

  1. The work of provision of protective measures on receipt of the estimated cost should be completed as early as possible and thereafter clearance for the energization of power line should be issued to State Electricity Board authorities.

For cases above 132 KV the procedure at present being followed will continue.

This letter may please be acknowledged.

Encl: as above.


(A.K Das)

Joint Director, Telecom (G)
Copy to:

  1. The Joint Secretary (Power), PTCC, West Block No. II, R.K. Puram, New Delhi 110022. He is requested to advise all the State Electricity Board authorities to ensure 4 copies of the route maps with railway tracks and principal stations to be sent to the concerned Railways and advice Power Members to furnish the induced voltage on railway block and communication circuits to the concerned Railways.

  1. (a) The Joint Secretary (Telecom), PTCC, Room No. 478 Khurshid Lal Bhavan, New Delhi 110001.

(b)The Divisional Engineer Telegraphs, PTCC, O/o The G.M. Telecom, Taher Mansion, Eastern Region, 5th Floor, B-Bentick Street, Kolkata-1.

(c) The Divisional Engineer Telegraphs, PTCC, O/o GM Telecom Maharashtra Circle, GPO Building, Walchand Hirachand Marg, Fort, Mumbai -400001.
(d) The Divisional Engineer Telegraphs, PTCC, Southern Region, 100/101, Walajah Road, Chennai- 600002.
for information. They are requested to ensure that no route clearance to the cases is issued without Railways’ approval has been received or Railways’ recommendations have been incorporated.

(A.K. Das)

Joint Director, Telecom (G)


  1. Address at Sl. No. 1 above may now be read as given 2.2(i) of Section-A of Chapter III.

  2. Addresses of regional DETs (PTCC) given at Sl. No. 2(a), (b), (c) and (d) above and in the main body of the letter may now be read as given in 2.2 (ii) of Section-A of Chapter III.

For Protective Measures against Induced Voltages on Different Types of Block Instruments in Use in Indian Railways

  1. Neale’s Token Instrument and Neale’s Tablet instruments with the characteristics similar to Neale’s Token in respect of 3-position Relay and Tock Magnet & Neale’s ‘D’Type.

  1. For induced voltage not exceeding 430 V no special precaution is necessary.

  1. For induced voltages exceeding 430 V metallic return and appropriate Gas Discharge tubes are to be provided.

  1. Western Railway Type Single Line Tablet Instrument

This instrument is immune up to 75V AC induced voltages and cannot be used where it is expected to have more than 75 V AC induced voltages.

  1. Carson Double Line Block Instruments.

Induced AC voltages exceeding 125 V result in unsafe condition and hence cannot be used where induced voltages are likely to exceed 125V.

  1. Siemen’s Tokenless Block Instruments.

This instrument can stand induced AC voltages up to 210 AC r.m.s with the following modification:

  1. Condenser C2 of the frequency converter card disconnected and

  2. All the lightning dischargers provided within the instrument must be removed and lightning dischargers having voltage rating not less than 350 V provided externally between each line and earth. This provision of limit of 350 V will also apply to lightning dischargers if any provided by P&T Department on the line.

This instrument is not considered suitable for use in AC electrified section.

  1. SGE Double Line Block Instrument

As in Sl. No. 1.

  1. Kyosan Tokenless Block Instrument

Since the induced voltage of the order of 38 V Single Phase AC causes distortion and mutilation of the codes and can cause unsafe condition, this type of block instrument is not considered to be immunized against AC induced voltage beyond 30V.

(Note: Immunity level was modified subsequently vide Railway Board letter

No. 90/Telecom/PTCC/P/1 dated 25.5.1993, given on next page).

  1. Diado Double Line Block Instruments.

This block instrument is safe for installation on circuits where AC induced voltage does not exceed 24 V r.m.s.

  1. Diado Single Line Tokenless Block Instruments

Without modification this instrument can safely stand induction up to 74V 50 cycles AC induced voltages. For induced voltages up to 650V AC the following modification is to be made:

A-3 position polarized relay of the type used in Neale’s token or SGE double line block instrument is to be interposed in the line circuit and the existing line relay (NR Relay) fed from local battery through the contacts of polarized relay. Also the line condensers C1 & C2 each of the microfarad capacity with a voltage rating of 160V are to be replaced by condensers of equal capacitance but with a voltage rating of 1000V Standard gas dischargers will also have to be provided for the lines.

  1. Podanur Make Single Line Tokenless Block Instrument (Push Button Type)

This instrument is only suitable for use in non-AC electrified sections. This instrument is safe for use in block circuits subjected to maximum induction 650V r.m.s. 50 cycles AC from neighboring power line provided the existing DC blocking condenser in the telephone circuits is replaced by a one rated for 1000V DC for non AC section only (non AC electrified).

  1. Tyres Tablet Token Instrument No. 7

Tests indicate that the instrument is not safe for induced voltages higher than 150V AC

  1. Neale’s Voucher Block Instrument

This instrument is safe for induced AC voltages up to 430V. This instrument is not suitable beyond 430V.

  1. Thcobald Token Instrument

It has been found that the instruments can withstand induced AC voltage up to 430V without any unsafe failure.

  1. Syko’s Lock and Block Instruments

It is considered that the Syko’s lock and block instrument is safe with induced voltage up to 15V only. In view of this low value of the induced voltage, which the instrument can withstand, it is desirable not to use this instrument on sections where any induced voltage may be expected.

14. Rest of the types of single line and double line block instruments are not safe for use in sections having AC induced voltages.
15. Maximum acceptable limit of induced voltage due to power parallelism is up to 2000V on railway block and communication circuits subject to the specific limitations mentioned above.
The cases of induced voltages above these limits should be treated as re-engineering cases and each such case should be treated separately in consultation with the Railway Board.
II. Copy of Director Telecom (Railway Board) New Delhi Letter No. 90/ Telecom/ PTCC/ P1 dated 25th May 1993.

General Manager (S&T)

All India Railways

Director General (Telecom)

RDSO, Lucknow.
Subject: AC Immunity Level of Block Instrument.
Reference: This office letter No. 77/W3/TCM/2/Meeting dated 3rd April 1978.
Railway Board vides above referred letter circulated the AC Immunity levels of various block instruments. Please add the following in the list already circulated vide above referred letter.
Block Instrument : Kyosan Tokenless Push Button.
Immunization Level : 650 V AC with modification similar to Podanur’s Tokenless Single line block instrument as mentioned in Item 9 of the above referred letter.

(S.C. Sharma)

Director (Telecom)
Copy to :

  1. Director (PTCC), PTCC Directorate, Central Electricity Authority, West Block-2,Wing-1, Ground Floor, RK Puram New Delhi 110066.

  2. The Chief General Manager, T&D Circle, Department of Telecommunications, Sanchar Vikas Bhavan, ResidencyRoad, Jabalpur 482001.

With enclosure of Railway Board’s letter No. 77/W3/TCM/2/Meeting dated 3.4.1978 (in 4 pages) for information and necessary action.


Director (Telecom)
Appendix XVIII to Chapter I

(Refer Para 6.12.1)
Guidelines for Laying Underground Power Cables Greater Than 33 KV in Proximity With Telecom Cables
Para 2.11 of Minutes of 82nd Central PTCC Meeting held at Lucknow regarding power cables of more than 33 KV.
The guidelines for laying of underground power cables greater than 33 KV in proximity with the telecommunication cables framed by the Central PTCC has been accepted by the Central Electricity Board in its 39th Meeting held in December 2002. The same are reproduced below for information and reference.

Agenda Item No. :3.39.2002

Name and address of the

Proposer :Shri G. Kesava Rao

Chief Engineer (LD & T) Division, CEA

Existing Rule No. :87-relating to PTCC

Sl. No. 22

Agenda Item No. :9.39.2002

Name and address of the

Proposer :Shri P.K. Khindri

Chief General Manager

Department of Telecommunications

Training & Development Circle, Jabalpur

Existing Rule No. :87- A (New Rule)

The above two proposals were clubbed for discussion. The proposers explained the reasons for the amendments and stated that the existing specification of the Bureau of Indian Standards covers cables only up to 33 KV rating. The PTCC (All India) was constituted in 1949 with joint participation of the Central Electricity Authority, Ministry of Communication, Ministry of Railways, Ministry of Defence, BSNL & SEBs and meets regularly at intervals of six months. It has constituted a sub-committee in which CEA is also a member. The sub-committee had approached the Bureau of Indian Standards for inclusion of “PTCC Guidelines” in the existing specification of BIS. However the BIS has not accepted.

Shri Mukherjee, BIS, Shri Ram Swarup, Director, Central Electricity Authority, Shri Panigrahi, DDG, Dept. of Telecommunications, Shri Subramanian, CEI to Government of Tamil Nadu, Shri Jain, Director(Technical), HVPNL, Shri Durairaj, Chief Engineer (Planning), TNEB, Shri Vaishnav, CEI to Government of Gujarat, and Shri Aggarwal, Chief Engineer(EI), CEA, participated in the detailed discussions and gave their view points. Shri Jain, Director (Technical), HVPNL has stated that clearance of 0.3m up to 33 KV rating shall be retained as per existing BIS. He also opined that 0.6 m clearance between power cables greater than 33 KV and telecom cables may be adopted and proposed amendment 87(b) can be covered under rule 87A. Subsequent to the discussions the following modifications to the proposed amendments are accepted;

(i) Suitable coverage to underground power cables in the form of changed heading in the form of Rule 87A to be made.

  1. The value of minimum clearance for underground power cables to be kept as 0.3 meters for 33 KV and less and 0.6 meters for 33 KV and above.

(iii) Power cables greater than 33 KV to be laid at a minimum depth of 1.2 meters.

Appendix XIX to Chapter I

(Refer Para 6.13.1)

  1. Separate Questionnaire for referring HT and EHT power line to be included in the revised Edition as HT line requires Form-A and Form-B which is enclosed herewith. (Enclosure-I)

  1. Marking of Telecom Details for power line proposal:

Capacity of Power Line

Telecom assets to be marked

HT (High Tension power line)

11 KV

3 Kms on either side of proposed power line

22 KV

5 Kms on either side of proposed power line

33 KV SC (Single Circuit)

5 Kms on either side of proposed power line

EHT (Extra High Tension power line)

33 KV DC (Double Circuit

8 Kms on either side of proposed power line

66 KV SC and above

8 Kms on either side of proposed power line

Power cable should have the shortest length of parallelism with BSNL cables. When high voltage cables 11 KV and above, has a parallelism exceeding 0.8 Km with BSNL cable should be marked in the topo map for suitable recommendation, which implies power cables of length less than 0.8 Km need not be marked in the topo map. Hence for many power proposals of length less than 0.8 Km, Telecom details need not be called for, which considerably eases the work of both BSNL and EB authorities

III. Various Level of PTCC meeting:


PTCC meeting



Central level

Once in six months


State level

Once in three months


SSA/Telecom District

Once in three months


Divisional Leve

Once in two months


Sub divisional level

Once in a month

IV. Precedure for clearance of Power and Telecom circuits by PTCC

1. Submission of Quesstionaire in the standard proforma with Topo Map supplied by Survey map of India to the concerned authority.

2. Processing by compenent authority and calculation of Induced voltage on paralleling telecom circuits.

3. Issue of Route Approval Certificate (RAC)

4. Issue of Crossing Approval

5. Submission of Form F by concerned GM BSNL

6. Issue of Energisation approval

IV.2. Processing by compenent authority and calculation of Induced voltage on paralleling telecom circuits etc .
2.1. The power proposal from Chief Engineer , SEB for erection of 33 KV DC and above with topo map (2 copies) to be submitted to DE PTCC, Respective SSA Head, Rspective Railways and STRC/NTRC This proposal should contain Soil Resistivity data and Earth potential Rise
Report(EPR). In case the proposed power line comes under two states, proposal to be submitted to both the states of concerned authority.

2.2 The concerned field units mark all the Exges, cables as per the check list enclosed and sent to DE PTCC. (Enclosure-II)

2.3 After scruitinising the telecom details sent by the SSAs and forwarded to the concerned SEB a thorities for Low frequency Induction.

2.4 Similarly the concerned railway will also mark their railway telecom details and sent it for the concerned SEB for Low frequency Induction.

2.5 DE PTCC and Railway authority get back induced voltage report from the SEB.

2.6 DEPTCC will issue Route Approval Certificate (RAC) on receipt of NOC from Railway and STR with due recommendations.

2.7 When the route approval certificate is received from the DET, PTCC, T&D

Circle, the following points may be checked up by the concerned authority

(a) Whether GD tube protection is recommended to any telecom assets and if so at whose cost it is to be carried i.e., BSNL or SEB.

(b) Whether any EPR zone limits are specified.

2.8 Submission of inspection report (Form F)

Form F is enclosed. (Enclosure-III)

Ensure the following points in the Inspection Report:

  1. The items which are not applicable may be struck off.

  2. GD Tube protection work, wherever done, is to be indicated in the concerned Annexure.

  3. The number of crossings mentioned in the Inspection Report may be reconciled with that in the SEB proposal.

  4. The form “F” is to be countersigned by GM/DGM as the case may be.

  5. Even if there is no telecom crossing involved with a powerline, the Inspection form is to be submitted by the SSA to confirm it.

2.9 Wherever defects/deficiencies are noted, appropriate action may be taken. Fulfilling all the points the energisation approval will be issued by the

The given below Flow Chart gives the idea of processing the power proposals
Enclosed (Enclosure-IV)

IV. 3. Issue of Route Approval Certificate (RAC) , Crossing Approval (CA) and Energisation Approval (EA)
3.1 Table on issue of RAC, CA,EA

Sl No

Type of Work

11 KV


33KV DC / 66KV/ 110KV/ 132 KV

220KV/ 400KV



Proposal to be submitted to

DET Concerned


DET, PTCC T&D Circle

DET, PTCC T&D Circle


Processing and issue of RAC by

DET Concerned


DET, PTCC T&D Circle



Calculation of I.V done by

DET Concerned



Central Electricity Authority, New Delhi



SLPTCC (22/33KV)


CEA(220KV& above)


Crossing Approval issued by

DET Concerned

Head of SSA

CGMT,concerned Circle


Energisation Approval issued by

DET Concerned

Head of SSA

CGMT,concerned Circle

Time Limits For Issue of RAC



Type of line

Total weeks Allowed for RAC

Time(weeks)allowed for marking Telecom/power details




All steps to be done in 8 weeks






66 to 400 KV







Crossing Details

In addition to the Crossing details given in the PTCC manual through light on the following points.

Angle of crossing of Power Overhead line with Railway Overhead line”.


V. In chaperter VIII in 1995 PTCC Manual, explanations given for Earth potential rise.

There is a difference between protection recommended for GD tubes in Annexure II of RAC and the EPR contours. But field people are thinking that both are the same. This should be clearly indicated that

the GD tube protection recommended is for the cables/OH lines running parallel to the proposed power line and the EPR contours are for protection against the telecom assets falling within the EPR zone of the Sub Station.

For explanation the following Annexure-II of one RAC has been taken.

Annexure-II of RAC

Name of the Power Line: 220 KV DC/SC Line from 400 KV SS Gajwel to 220 KV SS Kamareddy.

1. No GD tube protection is recommended as the IV is within limits.

2. South Central Railway has given its clearance vide Lr No. SG.85/4/3/PTCC/APTRANSCO

Vol 27/8 dated 09/02/2009.

3. Telecom Authorities may ensure protection against EPR at the cost of later entrant to telecom assets and personnel within the EPR zone of the 400 KV SS at Gajwel& 220 KV SS at Kamareddy.The theoretical value of EPR zone in metres from the edge of the earth mat as intimated by APTRANSCO, Hyderabad is as follows.

Gajwel Kamareddy

For 430 Volts : 185.83 Mts. 261.50 Mts

For 650 Volts : 69.30 Mts. 156.74 Mts

For 7K Volts : --- ve. --- ve.

For 10 K Volts : --- ve. --- ve.


The EPR contours which define hazard zone for the telecom plants are as given below.


Type of telecom plant

Type of Power system

High reliability lines


Terminal Apparatus, joints, cabinets, pillars, manholes, pits, poles.

650 V


Telephone Exchanges

430 V


Cables : Plastic insulated and plastic sheathed & PIJF

7 KV


Solid Polythene insulated fully filled UG PCM Cable

10 KV

Here No GD tube protection is recommended as IV is within limits, which means the induced voltage calculated for all paralleling circuits in this particular case is less than 430 volts.

Whereas for Gajwel SS for 430 volts the EPR zone is given as 185.83 mts which implies if any Telephone Exchange falls within 185.83 mts from the earthmat of the Sub Station, protection recommended in the PTCC Manual 1995 edition may be followed.

Similarly Sl.No.1 of EPR contours table ie. Terminal Apparatus, joints, cabinets, pillars, manholes, pits, poles are coming under 650 volts zone. It there is any item of this is available within 156.74 mts from the earth mat of the sub station at Kamareddy protection should be given for that item as per manual.


VI. Induced voltage calculation of HT power line

For Induced voltage calculation of HT power line graph method is given in manual which is very cumbersome . Instead of that MILK formula can be adopted for which the M.C. Chart is to be incorporated in the manual.

MILK formula

Induced Voltage = M.C.* F.C.* Screening factor of power and

telecom circuits

Where M=M.C. (Mutual coupling)

I = F.C. (Fault Current)

K = Screening factor

Note: Worst Fault Current for 11 KV -345 Amps

22 KV- 2*345 Amps

33 KV- 3*345 Amps


VII. Safety measures:

Reporting of Electrocution accidents:
The course of action to be taken on electrocution accident cases and procedure for submission of various PTCC reports etc for speedy disposal of electrocution cases is given hereunder.
Any accident either Fatal or Non fatal occurred in the SSAs should be reported to the circle office as well as Electrical Inspector by Telegram / FAX (within 24/48 hours) by the Head of the SSA after confirming that the accident has occurred due to power lines only.

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