As soon as the information is received about the occurrence of an electrocution accident the controlling officers have rush to the spot. Preliminary welfare measures in the victim are to be arranged most expeditiously.
Then following step by step action is to be taken.
Telegraphic intimation is to be given to the concerned Electrical Inspector of the District and Chief Electrical Inspector to the respective State Govt. within 24 hoursin case of a Fatal Accident / 48 hours in case of Non Fatal Accident along with 44 A Proforma & Written report. Also a telephonic message should be given to the Electrical Inspector, SDE PTCC, Circle office, DE PTCC, T&D Circle and concerned ADE, SEB.
The accident spot and surrounding areas are to be surveyed and all evidences are to be recorded by SDE concerned . A preliminary report and Part-1 report are then to be submitted to circle through of Head of SSA within one Week of occurrence of accident. Part-I contains
Name and Designation of the person involved
Date of occurrence of accident
Nature of injury (extent of disablement) and medical report on the cause of the injury.
Welfare measures taken
Whether the injured person was visited in the Hospital
Whether any financial or other help was given to injured or his family.
A joint inspection has to be carried out by SDE and ADE of SEB and the report signed by both and should be submitted to circle office within four weeks along with Part-II report, Medical / Post-Mortem and Police report (FIR).
Electrical Inspector will conduct an enquiry on the accident. SDE should pursue with the Electrical Inspector for sending his report early.
Departmental Enquiry will be conducted by circle office and SDE PTCC of T&D circle may be co-opted.
Complete settlement of welfare measures such as (a) Compensation under W.C. Act (b) DCRG (c) Pension and (d) Employment should be completed within eight weeks of occurrence of the accident.
All reports submitted to the circle office should be personally signed by concerned GM of the SSA who should satisfy that action on all points has been completed as per the instructions.
Procedure for reporting cases of electrocution accidents and formats are enclosed herewith (Enclosure-V)
6Reasons for Accidents:
1. Unguarded power crossings: Providing proper guarding at unguarded power crossing with telecom lines to avoid accidental contact and to prevent consequent hazards to telecom personnel and equipment. Field units should hold periodical meetings with EB at different levels and should have time bound programme for deduction of all UGPCs and providing proper guardings. No new lines should be commissioned without completing the guarding work wherever the telecom line crosses the electric wire.
2. Non using protective Devices:
The second line of defence is by way of providing personal protective devices to the staff for their use while handling telecom installations. These protective devices are classified under two categories.
Basic safety devices
Rubber Gloves (Type-I) IS 4770
Safety Belt (DOT Spec) S/QP-104A, DT/6.10.77
Rubber Shoes – IS 3755
Helmet (Yellow colour) IS 2925
are to be provided.
Additional safety devices:
i. High voltage Tester RL No: 170110
ii. Artificial Resuscitator.
3. Improper supervision & working on the line without Power shut down:
Power shut down should be taken while handling the telecom installations in the vicinity of exposed power installations and work is to be carried out with proper supervision.
4. Other General Protective measures:
Periodical patrolling of lines is to be ensured so that all PTCC violations such as UGPCs, worn out electric service leads etc are noticed and immediate follow up action is taken to get them rectified.
Sub Divisional and Divisional and State level PTCC meetings are to used to record PTCC violations and monitor the progress of their rectification.
Handling of telecom installations in stormy weather conditions should be avoided.
All new power and telecom lines should be referred to PTCC at the survey stage to ensure necessary protection to telecom installations.
If noise or induction is noticed on any existing telecom circuit, the matter has to be immediately reported to PTCC for examination and suggestion on necessary protection.
Training and Education:
The efficiency of safety orientation not only lies in provision of safety devices but also in educating and training the personnel about their utility, usage and maintenance. Demonstration, lectures, training courses and workshops in PTCC aspects have to be arranged to make safe working a habit for telecom personnel.
Administration have issued rulings and regulation from time to time, which have to be implemented by the staff. Stringent measures have to be adopted to avoid lapse on the part of the staff in implementing the safety programme.
Development of Safety programme:
Statistics of electrocution accidents are collected every year and reviewed. It helps in deciding the remedial measures to avoid recurrence of accidents. It also helps in finalizing guidelines for future safety programmes. Development of safety engineering measures based on the feed back from the field is, thus, a continuous process for betterment of safety.
Conclusion: The safety measures described above are largely preventive in nature and seek reasonable protection to telecom installations and personnel. The cooperation of the power authorities is equally essential in ensuring the overall safety of telecom installations and personnel.
VIII. GD tube specification for BSNL UG cable:
GD tube specification for BSNL UG cable is to be included in the revised edition which will be very helpful while procuring GD tubes in the field unit.
Also Guidelines for installing the GD tubes on BSNL cable as protection in RAC in case of more than 2 locations recommended and no pillar is available in between.
Chapter II Various Committees Connected With
Power & Telecommunication Coordination 1.0 After its inception in 1949 all cases for PTCC clearance were being referred to the Central PTCC. The work at the Central level increased enormously due to the enormous spurt in both the Power and Communication sectors. The clearance of 11 KV lines was entrusted to DEs (T) of the Telecom Department on the basis of guidelines prepared by the Central PTCC. It was necessary to further decentralize the work relating to lines up to 33 KV. Accordingly, State Level Committees were set up in 1968 with representation from the Power and Telecom sides. A ‘Simplified Procedure’ for issue of clearance in such cases was prepared by the Central PTCC.
2.0 With the increasing complexities in matters connected with PTCC clearance and the problems posed by large financial outlays incurred in re-engineering of telecom lines, it was decided in 1977 to have an informal High Level Committee of the Members from the CEA and the then P&T Board to go into cases not settled by the PTCC.
3.0 In view of the increasing tempo of transmission line construction, it became difficult for the CEA to process all cases of lines beyond 66 KV. As decided by the conference of Chairman of State Electricity Boards in January 1978, the work relating to computation of induction from power lines of 66 KV, 110 KV and 132 KV was decentralized w.e.f. June 1978. Officers nominated by SEBs specifically for the purpose started dealing with these cases in conjunction with the Regional DEs (T) PTCC who issue route approvals on behalf of Central PTCC. In February 1979 the Central PTCC decided that State Level PTCCs would discuss all cases of lines up to 132 KV.
Summing up, the various Committees involved in PTCC matters are as follow:
The informal High Level Committee comprised of the Member (G&O) of CEA and Member (TD) of Telecom Board meeting at intervals by mutual consent.
(ii) Central PTCC with nominees at present as indicated in Appendix IV to Chapter I, meeting 4 times a year. The CE (LD&T), CEA/CGM, T&D Circle, DOT chair the meetings in alternate years.
State Level PTCCs with nominees at present as indicated in Appendix XV to Chapter I. The SE from State Electricity Board and Director (Telecom) from DOT chair the meetings in alternate years. Meetings are held generally every month but not later than a quarter. The Chairmanship is fixed by mutual consent.
High Level Committee
5.1Composition In a few cases like upper limit of voltage for GD tubes, cost apportionment etc. where no consensus could be arrived at in the Central PTCC, such cases are discussed at the level of Secretary (Power) or Chairman/Member, CEA assisted by other officers from Ministry of Energy/ CEA and Secretary (Communication) or Members from the Telecom Board assisted by other officers from the Telecom side. Officers of appropriate level from the Railways are also invited when there are issues involving them.
5.2 Central Standing Committee In the high level meeting between representatives of Department of Telecom and Department of Power on re-engineering held on 4.5.1992 at New Delhi, it was decided that the Central Standing Committee should be revived so that it could look into such estimates which have resulted in delay in settling re-engineering cases. It will consist of two representatives from DOT and Two from CEA, Director (ML), DOT will be the convener of the committee. Minutes of the said meeting are available at Sl.No. II in Appendix XIII to Chapter I.
6.1 Composition As per Appendix IV to Chapter I.
6.2Functions As already indicated in Chapter I, Basic function could be summarized as:
(i) To consider all matters relating to the adverse effect of power lines on telecom lines.
(ii) To consider specific cases of route approval of power lines exceeding 33 KV and telecom lines. Computations of induced voltages for lines over 33 KV and up to 132 KV are done by SEBs and for lines of 220 KV and above by the Central Electricity Authority.
(iii) To consider and adopt new protective measures to minimize the cost of protection.
6.3 Frequency of Meetings Generally once in three months.
State Level PTCC
The present membership of the State Level PTCC consists of officers of Junior Administrative Grade from the concerned SEB, Telecom Circle, Railways and Defence. It is as per Appendix XV to Chapter I.
The main functions of the Committee are as under:
To review the progress of route approval cases of 11 KV lines dealt with by Telecom District Engineers.
To consider route approval cases up to service voltages of 33 KV.
To consider re-engineering schemes for cases where induction exceeds the protection limit for GD tubes.
To co-ordinate and watch the progress of installation of protective measures and re-engineering works and issue of energization certificates on completion of protective works.
To consider violation of PTCC regulations and take suitable corrective measures.
To discuss cases of power lines of 66KV and above held up for PTCC clearance.
Other additional functions detailed in Appendix XV to Chapter I.
The meeting is generally to be convened once a month but not later then once in 3 months in any case and the Chairmanship is mostly by rotation between the SEB/DOT representatives.
8.0Formation of Protection/Re-engineering Supervisory Sub-committee. In the 89th Central PTCC meeting held at Aurangabad held on 23rd January 2009 the Central PTCC had accepted the proposal of CEA for formation of a Sub-committee to scrutinize the re-engineering estimates. The Supervisory committee should work to bring uniformity in the scope of equipment required for re-engineering and cost aspects thereof. The Chairman, Central PTCC, advised that in order to make this Supervisory Committee most effective it should include the member from the affected power utility, he will also be the convener of the meeting. He proposed that there should be three permanent members of this Supervisory Committee
1. Director (PTCC), CEA,
2. AGM (PTCC) T&D Circle, Jabalpur.
3. Director (Telecom), Railway Board.
He further proposed that there shall be two/three floating members in the Sub-committee which will be as follows:
1. Member from the affected power utility whose re-engineering proposal is to be scrutinized by the Sub-Committee.
2. A Member from the agency who has given the re-engineering estimate. It will be either BSNL or Railways.
3. Any other party which is directly affected by this re-engineering estimate.
Chairman Central PTCC further said that whenever required the meeting of the above committee has to be convened by the affected power utility.
Chapter III Procedure for Clearance of PTCC Cases of
Power and Telecommunication Lines with Effect from 1st June 1978 SECTION A POWER TRANSMISSION LINES (INCLUDING) POWER CABLES
1.1 Each power line is to be examined with respect to all the telecom lines inclusive of long distance cables, coaxial cables, railway circuits etc.
1.2 The cases of 11 KV lines are processed and approved by the respective divisional Engineer Telegraphs/Telephones. Induced voltage calculations are done by the DEs Telegraphs/Telephones as the case may be.
1.3 The cases above 11KV and up to 33KV lines are processed by the SDE (PTCC) of T&D Circle whose office is located at the office of Chief General Manager Telecom Induced Voltage calculations are made by the said SDE (PTCC)
1.4 Induced voltage calculations of lines of 33KV DC and above and up to 132KV are done by the nominated officers of the respective Electricity Boards. Induced voltage calculations above 132 KV are done by the Central Electricity Authority. Cases are processed by the DET (PTCC) concerned. In case of DC lines, strung initially as Single Circuit, PTCC clearance is not required again in case the computation is done on Double Circuit basis initially itself. In such cases only the DOT is to be informed.
1.5 The recommendations of the Railways are incorporated in respect of the railway block circuits in the Route Approval Certificate irrespective of the induced voltage.
Maximum safe limits of LF induction are 430V and 650V from ordinary and high reliability power lines respectively as per CCITT. The Indian PTCC has adopted these limits for power lines up to 33 KV and for 66 KV and beyond respectively.
1.7 Single Wire Earth Return Telegraph Circuits affected will be converted as per the relevant decision of the PTCC.
1.8 The PTCC Route Approval itself is not a clearance for energization and separate clearance will have to be obtained from the Railways/Telecom Authority maintaining the same.
Power Lines Exceeding 132 KV
2.1 In the case of power lines of 220 KV and above the application for clearance of the route is processed by the Central PTCC. The application for PTCC clearance is to be accompanied by the following documents:
(i) Questionnaire Number 1 as per proforma at Appendix 1 to Chapter III duly filled in with all relevant details.
(ii) A route map of the proposed power line (with terminal stations prominently marked) drawn to a scale of 1”=1 mile or 1 cm =0.5 km. The route map should depict all topographical details including railway lines, rivers, canals and important road and other landmarks like towns, villages with names etc. on either side of the proposed power line up to 8 kms.
(iii) Where there is close parallelism, the scale of the route map should be larger in order to compute the mutual coupling between the two lines accurately.
(iv) Statement showing the soil resistivity in the area covered by the line measured by the four electrode method with an inter-electrodes spacing of 50 meters, measurements being taken at every 2 or 3 kms. along the length of the line.
(v) Single-line diagram of the electrical layout of the relevant portion of the power system with details as in the questionnaire.
In the case of tap or spur lines, distances of the tap point from either of the end sub-stations should be clearly marked.
2.2 Copies of all the documents are to be sent to:
(i) Director (PTCC), PTCC Directorate, LD & T Division, Central Electricity Authority, NREB Complex, Katwaria Sarai, New Delhi110016.
(ii) Concerned DET (PTCC) of DOT as per addresses given below (with two additional copies of route map).
No.26, Sardar Patel Road, Guindy, Chennai – 600 032.
2.3 Copies of route map are also to be sent to:
(i) The local DET of the Telecom Department (two copies) with a request to mark the telecom lines involved and forward the same to the DET (PTCC) concerned; if more than one DE (T) is involved, additional copies to be sent to other DEs (T) concerned.
(ii) The SDE (PTCC), O/o CGM (Telecom), of the Circle concerned-One copy.
GM (S&T) of the Railways concerned (four copies) with a request to mark their telecom lines involved and forward one copy thereof to the Director (PTCC), Central Electricity Authority, New Delhi and one copy to the concerned DET (PTCC).
(The address of all the zones of the Railways along with their jurisdiction is given in Appendix III of this chapter) (iv) GM (Projects) and GM (Maintenance)-Two copies each.
Army Signals in case of border areas-Two copies.
2.4 The final PTCC clearance would be issued by the DET (PTCC) concerned after receipt of the induced voltage computations and Railways’ recommendations.
2.5 The State Electricity Boards will keep a liaison with the DOT/Railways to ensure that the protective measures are provided in time.
3.0 POWER LINES OF 33KV DC AND ABOVE UPTO 132 KV DC 3.1 In these cases the application for clearance of the route is to be processed by the State Electricity Board concerned, which is to designate a suitable officer and the DET (PTCC) as per 2.2(ii) above. The application for PTCC clearance is to be accompanied by the documents mentioned in 2.1 above. The route map is to cover 8 kms. on either side of power line for 66KV and above and 5 km. for 33KV lines.
3.2 Copies are to be sent to the officers as in 2.2 above except that instead of Director (PTCC), CEA mentioned therein, the officer designate in the Electricity Board is to be contacted.
3.3 Copies of the route map are to be sent to the officers mentioned at 2.3 above.
The final PTCC clearance would be issued by the DET (PTCC), concerned.
POWER LINES OF ABOVE 11KV UPTO 33 KV S/C
Detailed instructions are available in the booklet ‘Simplified Procedure for Co-ordination of Power lines up to and including 33 KV with Telecom lines’ detailed in Chapter IV of the Manual. The route map to cover 5 kms. on either side of power line for 33 KV and 22 KV. The route approval of all these cases is issued by the State Level PTCC.
POWER LINES OF 11 KV
The clearance is to be obtained from the local DET of the Telecom Department as per procedure given in the ‘Simplified Procedure’ mentioned in 4.0 above. This does not cover SWER power lines, regarding which separate guidelines are issued. The route map to cover 3 kms. on either side of power line for 11 KV.
SECTION B FOR THE USE OF DOT/ RAILWAY/ DEFENCE OFFICER
1.1 All telecom lines in the vicinity of the proposed power route would be marked distinctly to scale on the route map received from the power authorities. It is not enough to indicate a portion of the line only.
1.2 Not only the crossings but also the complete alignment of the telecom line, as actually in existence or planned, should be marked on the line route map to same scale. The stations, which the telecom line connects, should be clearly indicated and the entire portion falling on the route map should be shown.
1.3 L-14 diagrams should accompany the route map. No abbreviations or code words should be used but full name of stations shown.
1.4 Along with the route amp on which the telecom lines have been marked as indicated above, the details in full of all the circuits working on the telecom alignments giving the discontinuity points and route lengths, should be furnished.
1.5 The DET should furnish the telecom details, L-14 index etc. through the respective SDE (PTCC) to the DET (PTCC) concerned.
Note: The telecom details should be supplied to:
(i) The DET (PTCC) concerned within 2 months of receipt of the route map and should be complete.
(ii) The information regarding telecom particulars should be given in the proforma complying with all the points in the check sheets.
1.6 After receipt of the route approval, the Telecom/Railway authorities concerned shall arrange for the necessary protection expeditiously and intimate compliance to the Member (P) and Member (Telecom) of State Level PTCC and the Organization issuing the route approval. Member (Telecom) of concerned Telecom authority would then issue the energization approval for the power line. For computing the interference current on the earth return telegraph circuits, the following details are to be supplied in case of single-wire earth return telegram circuits.
Average height of telecom wire above ground in meters.
Number of line conductors excluding the telegraph wire under consideration, which are not insulated from earth.
Whether phantom has been employed for the telegraph circuit.
Length of telegraph section and separation from power line.
Details of telegraph apparatus including normal operating current and voltages.
SECTION C TELECOM LINES For the use of officers of Department of Telecommunications and Railway Board while submitting the applications for Route Approval
in case of new Telecommunication Lines
1.1 The route of all the Trunk lines, Junction lines, Long Distance PCO lines, Telegraph Circuits, Railway Circuits and Coaxial Cables should be referred to PTCC for Route Approval.
1.2 Each Circuit is to be studied for the effect of induced voltages from all the paralleling power lines, in the vicinity (for 11 KV lines up to 3 kms. 33 KV lines up to 5 kms. and above 33 KV lines up to 8 kms.)
All power line crossings should be as per the PTCC Code of Practice.
1.4 PTCC Route Approval itself is not a clearance. Provision of all protection is aMUST for energization. The protective measures should be carried out during construction.
2.1. The application for PTCC clearance is to be made at the survey stage itself. As the effect of the induced voltage is to be calculated with respect to all the power transmission lines, running parallel to the proposed telecom/railway lines, the case should be submitted to the respective DET (PTCC) and others concerned, i.e. Executive Engineer of the concerned Electricity Board and to the Director (PTCC), CEA, New Delhi. The approval will be issued by DET (PTCC) after the receipt of all induced voltage calculations.
2.2 The route of the proposed telecom line should be marked on a topographical map to the scale of 1”=1 mile or 1 cm=0.5 kms. The route map should show topographical details including all railway lines, rivers, canals and important roads and other landmarks like towns, villages, with names etc. on either side of the proposed telecom line up to 8 kms. The route of all the power lines also should be marked on the map.
(i) All Railway Stations falling on the map portion of the line should be physically located on the map and marked with names.
(ii) Care should always be taken to be as far away from the power lines as possible while fixing the telecom line route. Where, however, there is close parallelism in certain sections, the scales of the route map should be larger than 1”=1 mile in order to compute the mutual impedance between the two lines accurately for that particular section.
2.3 The application for PTCC approval is to be accompanied by the following documents:
(i) A Questionnaire Number 2 as per proforma at Appendix II to Chapter III, duly filled in with all relevant details.
(ii) Statements showing the soil resistivity in the area covered by the line measured by four electrode method with an inter electrode spacing of 50 meters, measurements being made at every 2 or 3 kms. along with the length of the line.
The L-14 diagram of the proposed telecom alignment.
(iv) The details of the circuit likely to work on the telecom lines (use of codes and abbreviation should not be made).
(v) The number of crossings and the angle of crossings with power line with location details.
2.4 Copies of all the documents as above (plus four additional copies of the route map) to Member (Power) of State Level PTCC for marking the power details. The later will get the power lines marked and send to SDE (PTCC) for lines of 33 KV S/C and below and to Director (PTCC) CEA, New Delhi, for lines of 220 KV and above. For the power lines of other voltages, the computations are done by the SEB. The results in all cases are sent to the DET (PTCC) concerned for necessary action to examine and issue the PTCC Route Approval.
Appendix I to Chapter III
(Refer Para 2.1 (I) of Section A) QUESTIONNAIRE 1 Government of India
Power & Telecommunication Co-ordination Committee
(To be answered by the Authorities In-charge of Power System
while Applying for PTCC Route Approvals.)
Please supply data of the power system as per details below:
1.1 Key diagram (single line) of the electrical layout of the relevant portions of the power system, indicating the number, voltage ratings, capacities, etc. of the various power apparatus. Indicate also by dotted lines the extension proposed ultimately or through the current Five Year Plan.
Note: By relevant is meant all the power stations, which under normal operating conditions will feed into a fault occurring within or outside the parallelism section as well as all lines on which such fault current would flow.
1.2 Data on the characteristics of equipment, viz. generators, transformers, reactors, synchronous condensers, earthing transformers, etc. installed in the system as per enclosed annexure (transient reactance figures should be given for all rotating machines).
1.3 Please state if the neutral points of the power system are (i) insulated, or (ii) earthed. If the latter, please indicate the type of earthing, e.g. solidly earthed, earthed through Peterson coils, earthed through resistance or reactance. Give also full particulars.
2.0 Please supply the following data in respect of the particular power line for which approval is sought.
2.2 Operating voltage and number of circuits.
(ii) Conductor/Earth wire size and material.
2.4 If it is a top or spur line, the length of the tap and the distance of the tapping point from the end sub-stations should be clearly indicated.
2.5 Is the power line bussed at any intermediate sub-stations? If so, please give details.
2.6 Will the power line initially be charged at some lower voltage?
2.7 Probable date of commencing the construction.
2.8 Probable date of commissioning.
2.9 Date by which approval is desired.
3.0 Please supply a route map showing the proposed alignment of the power line and the paralleling telecommunication lines in the area, drawn to a scale of 1 cm = 0.5 kms. or 1” = 1 mile. All topographical details including all railway lines, rivers, canals and important roads up to 8 kms. on either side of the proposed power line may also be drawn to the scale. The railway stations should be located on the map and named.
Note 1: If the proposed line is an extension of the existing line, which had not been referred to the Committee previously a similar route map of the existing line, should also be supplied along with the route map of the proposed line.
Note 2: A copy of the route map with telecom circuits marked be also sent to local DOT authorities and Railway authorities, requesting them to confirm the telecom circuit and also indicate the points of discontinuity in the telecom circuits to both the Joint Secretaries of the committee.
3.1 Number and date of the route map showing the proposed alignment.
4.0 Sketch or sketches or supports showing the conductor and group wire arrangements of the transmission line together with an indication of the sizes and materials of the various wires.
5.0 Please indicate the protective device adopted for the line. In respect of lines protected by circuit breakers, please furnish also the type of the lines and relaying proposed and the total time (Breaker and Relay) for clearance of ground faults on the line with normal relay settings.
Please indicate the soil resistivity in the area covered by the line. The soil resistivity should be measured by the four electrode method using an inter electrode spacing of 50 meters (150 feet). The measurements may be made at every 2 or 3 kms. along the length of the line.
Please indicate the number of crossings between the proposed alignment and the telecommunication lines involved and state if the crossing arrangements will be provided in accordance with the code of Practice for Crossings issued by the Power and Telecommunication Co-ordination Committee.
8.0 EPR details of End substations-
Name of Substation :
New / Existing :
Diagonal distance of earth mat in meters :
Maximum fault current of Substation in Amps :
Earth mat resistance in Ohms :
9.0 Main line particulars in the case of LILO/ tapline :
9a Whether any Railway lines are existing within 8 kms. on either side of the power line:
While applying for route approvals of the Committee, the above particulars should be furnished to:
Director (PTCC), Central Electricity Authority, Load Despatch & Telecommunication Division, PTCC Directorate, NREB Building, Shaheed Jeet Singh Marg, Katwaria Sarai, New Delhi 110016.
(ii) DET (PTCC) concerned.
N.B.:For computing the interference current from the power line on the single wire earth return telegraph circuits, indicate the maximum load current for which the power line has been designed.
Annexure to Appendix I Please furnish the characteristics of the various power apparatus as under:
while Applying for PTCC Route Approval) Section a (1) 1.0 Please supply the following data in respect of the particular telecom line for which approval is sought:
Probable date of commencing the construction.
Probable date of commissioning
Date by which approval is desired.
Please supply a route map showing the proposed route of the telecom line and also the existing/proposed power lines in the area drawn to a scale of 1”=1 mile or 1 cm=0.5 kms. Topographical details including railway lines, rivers, canals and important roads up to 8 kms. on either side of the proposed telecom line should also be drawn on the map.
Number and date of the route map.
Sketch or sketches of L-14 diagram of the proposed alignment.
Details of the circuits likely to work on the proposed line with discontinuity points and route lengths.
Please indicate the soil resistivity in the area covered by the proposed line. The soil resistivity should be measured by the four electrode method using an inter electrode spacing of 50 meters. The measurements may be made at every 2 or 3 kms. along with the length of the line.
Please indicate the number of crossings and angle of crossings between the proposed telecom alignment and the power lines and give a certificate that the crossing arrangement will be made in accordance with the Code of Practice for Crossings issued by PTCC.
Additional information as per Para 1.6 item (i) to (v) of Section B in Chapter III, for telegraph circuits.
Date: Signature and Designation of Telecom/Railway Authority
(To be furnished by the SEB)
Section a (2) 2.0 Please supply the following data in respect of the power lines existing or proposed on either side of proposed telecom line (up to 8 kms. for 66 KV and above, 5 kms. for lines above 11 KV and up to 33KV and 3 kms. for lines up to 11KV).
Name of the power line/lines.
2.2 Operating voltage and number of circuits of power line/lines.
2.3 Length of power line/lines.
2.4 Whether the route(s) of power line/ lines has/ have been approved by PTCC? If yes, please indicate approval certificate number and date.
2.5 The designation and address of the officer in-charge of the power line/lines.
Date: Signature and Designation of Officer of SEB/ Deptt
Section b (1)
(Applicable to Coaxial Cables)
Name of the coaxial cable route.
(a) Number of coaxial tubes.
(b) Size of the coaxial tubes.
(c) Maximum frequency used on the coaxial conductors.
(d) Details of interstice pairs.
The characteristic curves of screening factor for the proposed coaxial cable.
Probable date of commencing the construction.
Probable date of commissioning.
Date by which approval is desired.
Please supply the route map showing the proposed route of the coaxial cable to enable the Power authorities to mark the existing/proposed power lines in the area, drawn to the scale of 1” = 1 mile or 1 cm = 0.5 kms. Topographical details including railway lines, rivers, canals and important roads up to 8 kms. on either side of the proposed coaxial cable route should also be drawn up on the map.
Number and date of the route map.
Please indicate the soil resistivity of the area covered by the proposed coaxial cable route. Soil resistivity should be measured by the four electrode method using the inter electrode spacing of 50 meters. The measurement may be made at every 2 or 3 kms. along with length of the route.
Please indicate the screening factor characteristics for the coaxial cable.
Date: Signature and Designation of Telecom/ Railway Authority
(To be furnished by the SEB)
Section b (2) 2.0 Please supply the following data of the power lines existing or proposed on either side of the proposed coaxial cable route (up to 8 kms. for 33 KV DC and above, 5 kms. for lines above 11KV and up to 33 KV SC and 3 kms. for lines up to 11KV.)
2.1 Name of the power line/lines.
2.2 Operating voltage and number of circuits of power line/line.
2.3 Length of the power line/lines.
2.4 Whether the route of power line/lines has been approved for the PTCC. If yes, please indicate the approval certificate number and date.
Date: Signature and Designation of Officers of SEB/ Department
(Applicable for Armored OF Cables)
QUESTIONNAIRE FOR ARMORED OFCABLE 1. Name of OFC route :
2. Route length :
3. Probable date of commencement of construction :
4. Probable date of commissioning :
5. Date by which approval is desired :
6. Please supply route map showing the proposed armored OFC route indicating all jointing locations in the map. The scale of the map should be 1” = 1 mile or 1cm = 0.5 km and should be written in the map. Topographical details including Railway lines, rivers, canals, and important roads, upto 8 kms. on either side of the proposed cable should also be drawn. There should be a 8 km. spacing on either side of the OFC in the map. :
7. Please indicate the soil resistivity in the area covered by the proposed OFC. The soil resistivity should be measured by the four electrode method using an inter electrode spacing of 50 meters. The measurements may be made at every 2 or 3 kms. along the length of the line. :
Date Signature and Designation of
Place Telecom Authority
To be submitted to DET PTCC
1. Questionnaire – 1 copy
2. Route map with the following details – 3 copies
a) Mark the OF cable route in the map so as to have 8 km spacing on either side of the cable.
b) Indicate the joint locations in the map.
c) Write the names of the terminals of the OFC route. In case of spur routes, name
of the tapping point location should be given.
d) Write the scale of the map in the map itself.
3. Value of induced voltage on the OFC due to 11 KV power lines.
4. Soil resistivity data
To be submitted to SDE PTCC, T & D Circle, o/o CGM Telecom
1. Questionnaire – 1 copy
2. Route map with the following details – 1 copy
a) Mark the OF cable route in the map.
b) Indicate the joint locations in the map.
c) Write the names of the terminals of the OFC route. In case of spur routes, name of the tapping point location should be given.
d) Write the scale of the map in the map itself.
e) Get all 33 KV SC/ 22 KV power lines, existing as well as proposed, within 8 kms. on either side of the power line marked in the map by Electricity authorities.
f) Indicate transformer capacities and type/ gauge of the conductor and name of the terminals for each power line route on the map.
g) Following certificate in the map signed by Electricity authorities:
Certified that all 22 KV / 33 KV SC power lines, existing as well as proposed, within 8 kms. on either side of the power line have been marked in the map.
3. Soil resistivity data.
Appendix III to Chapter III
(Refer Para 2.3(I) of Section C)
CHAPTER IV Simplified Procedure for Co-ordination of Power Lines
Up to and including 33 KV with Telecommunication Lines
Power and telecommunication lines constitute essential lifelines of any community. Very often they will have to follow the same road or railway alignment and thus will have to exist close to each other. Any high voltage power line sets up in its vicinity electric and magnetic fields. Communication circuits coming under the influence of these fields will experience extraneous induction. The extraneous induction under certain conditions may introduce noise in communication circuits and/or cause danger to communication equipment or personnel. Therefore it is very essential that whenever power and telecommunication lines have to take rights of way close to each other, suitable co-ordination measures are effected to derive maximum benefits from both the systems. The specific co-ordination principle to be adopted, depends on the operating conditions of the two systems. In this country, the power systems are operated with their neutrals effectively grounded. The communication lines are generally of the overhead open wire type. With such systems, earth return currents on power circuits caused during asymmetrical faults on power lines can induce dangerously high voltages on the communication circuits. Therefore, the Power & Telecommunication Co-ordination Committee (PTCC) has based the Power and Telecommunication Co-ordination in this country on the principle of low frequency induction. It may be mentioned that with the co-ordination based on low frequency induction and the limits given in Para 2 being adhered to, the requirements in respect of noise interference are taken care of.
Principle of low frequency inductive coordination
The principle of low frequency inductive co-ordination essentially involves the determination of the induced voltage on the communication circuits under single line to ground fault conditions on the power line and limiting the induced voltages in the different sections to be prescribed limits. The prescribed limit for parallelism with power lines up to and including 33 KV is 430 volts.
3. This simple graphical method for examination of power and telecommunication lines; parallelisms for purposes of co-ordination is divided into five parts as under: