egkjktiqj xokfy;j precaution to be taken...contact wire while working resulting kink form under...

CAMTECH/E/11-12/Spl-Pre for OHE/1.0

Special Precaution to be Taken for Maintenance December, 2011 of OHE and Attending Break Downs at Sharp Curves

1

Hkkjr ljdkj GOVERNMENT OF INDIA

jsy ea=ky;jsy ea=ky;jsy ea=ky;jsy ea=ky; MINISTRY OF RAILWAYS

SPECIAL PRECAUTIONS TO BE TAKEN

for

MAINTENANCE OF OHE AND

ATTENDING BREAKDOWNS

AT SHARP CURVES TARGET GROUP : OHE Staff

CAMTECH/ E/11-12/Spl-Pre.-OHE/1.0

December, 2011

egkjktiqjegkjktiqjegkjktiqjegkjktiqj, Xokfy;j & Xokfy;j & Xokfy;j & Xokfy;j & 474 005474 005474 005474 005

Maharajpur, GWALIOR - 474 005


December, 2011 Special Precaution to be Taken for Maintenance of OHE and Attending Break Downs at Sharp Curves

2

SPECIAL PRECAUTIONS TO BE TAKENSPECIAL PRECAUTIONS TO BE TAKENSPECIAL PRECAUTIONS TO BE TAKENSPECIAL PRECAUTIONS TO BE TAKEN

FORFORFORFOR

MAINTENANCE OF OHE AND ATTENDING MAINTENANCE OF OHE AND ATTENDING MAINTENANCE OF OHE AND ATTENDING MAINTENANCE OF OHE AND ATTENDING

BREAK DOWNSBREAK DOWNSBREAK DOWNSBREAK DOWNS AT SHARP CURVESAT SHARP CURVESAT SHARP CURVESAT SHARP CURVES

QUALITY POLICY

“To develop safe, modern and cost

effective Railway Technology complying

with Statutory and Regulatory

requirements, through excellence in

Research, Designs and Standards and

Continual improvements in Quality

Management System to cater to

growing demand of passenger and

freight traffic on the railways”.



3

PREFACEPREFACEPREFACEPREFACE

While carrying out maintenance of OHE,

precautions are to be taken to ensure safety of the working personnel. This pocketbook comprises precautions while working /maintenance of OHE including while attending breakdowns at sharp curves.

It is clarified that this pocketbook does not

supersede any existing provisions laid down by Railway Board, RDSO or AC Traction Manual (ACTM). It is for guidance only and it is not a statutory document.

I am sincerely thankful to TI Directorate RDSO Lucknow and also all field personnel who helped us in preparing this pocketbook.

Technological up-gradation & learning is a

continuous process. Please feel free to write to us for any addition/ modification in this pocketbook. We shall highly appreciate your contribution in this direction.

CAMTECH, Gwalior Peeyoosh Gupta Date: 23.12.2011 Jt.Director Electrical

e-mail: [email protected]



4

CONTENTSCONTENTSCONTENTSCONTENTS

A. SPECIAL PRECAUTIONS SHOULD BE TAKEN BY STAFF WHILE WORKING/ MAINTENANCE ON OHE. 01

B. SPECIAL PRECAUTIONS TO BE TAKEN WHILE ATTENDING BREAK DOWN AT SHARP CURVES 17



5

A. SPECIAL PRECAUTION

SHOULD BE TAKEN

BY STAFF WHILE

WORKING/

MAINTENANCE ON

OHE



1

1. No work shall be done above or within a

distance of 2 metres from the live OHE without a "Permit to Work".

2. Inductive effects occur on large metallic

structures such as fencings, structural steel of platforms running parallel to the track. They will have to be earthed suitably.

3. Discharge/Earthing pole assembly shall be

inspected by SE/JE once a month.

4. Each working gang shall be protected by at

least two independent earths, one on each side of a working gang.



2

5. The continuity of the cable connection between the top clamp and the earthing clamp should be checked once a fortnight.

6. The cable of earth pole

should be renewed if more than 20% strands are broken.

7. The cable of earth

pole shall be flexible and should have adequate cross-section 40 mm2 so as

to withstand short circuit currents.



3

8. For providing earth on the OHE, fix the earthing clamp securely to a mast at least one span away after making sure that the mast to earth rail bond of this mast is intact.

9. Earthing clamps should always be fixed to the traction rail or mast first and then the top clamp must be tested on RT or BT and hooked to the contact wire.



4

10. For removing the earthing, first remove the hook of discharge rod on the OHE and then the clamp fixed to the rail or mast.

11. If the distance between the working gang

exceeds 100 meters, intermediate earth shall be provided in such a manner as to ensure that the distance between earths does not exceed 100 meters.

12. No fallen wires shall be

touched unless power is switched off and the wire suitably earthed.

Fallen wire



5

13. Men shall be deputed on both sides of the site

of work to warn the working party of any approaching train on the same track and adjacent track.

14. In electrified track, steel

tape or metallic tape or tape with woven metal reinforcement should not be used.

15. In electrified track, PVC

fiber glass tape shall be used.

16. Even when earthing is

provided by isolator switches with earthing heels, additional temporary earths shall also be provided both side of the isolator at two points.



6

17. Neutral sections should be treated as live equipment and earthed separately at two points on either side of the working gang before commencing work.

18. Ropes made of cotton

or jute with ladders should be used. Use of metallic ropes is prohibited.

19. All the staff should wear helmets to protect

their heads against any tools or equipment which may drop down accidentally.



7

20. Ends of conductors which may have snapped should be separately earthed at two points after switching off supply to both parts of the OHE. This precaution should also be observed when working or in the vicinity of a sectioning point and cut in insulators.

21. Staff should protect

themselves against an inadvertent fall by wearing a safety belt and helmet for supporting themselves by a rope sling.

22. When work is to be carried out on an isolator, both sides of the isolator should be earthed at two points.

23. The useful cross section of a conductor shall

not be reduced while making joints.



8

24. Ropes, pulleys, pulllifts, come along clamps, ‘D’shakells and tirfors etc. should be tested once in six months at least, in the presence of SE/JE-(TRD), and record of such tests maintained in each depot.



9

25. A ladder should be

held by one person on the ground to prevent slipping, while the top end should be tied to the supporting structure or conductor to keep it in position and prevent it sliding away.

26. Ladders should never

be allowed to fall on or rest against the contact wire.

27. It is important that staff who asks for power block should know the correct method of identifying and describing any section of OHE where shutdown is required.



10

28. Do not stand on

contact wire while working resulting kink form under swivel clip.

29. Ladder should be always allowed to fall on catenary wire towards the mast side.

30. Always provide 20/16

dia. GI bolt in step of ladder which is used for pull lift and extension step.



11

31. More than one

person shall not normally be allowed on a ladder as far as possible.

32. Climbing on a ladder with wet or slippery foot

wear is forbidden. 33. Whenever there is a doubt in the description,

the person asking for power block shall state clearly the line (Up or Dn) and OHE structure numbers between which works is to be done.

34. Do not wear loose cloths

such as kurta pazama, Lungi, safi, chappal etc..



12

35. Always wear rubber sole shoes while working.

36. A rope should be used to pass tools or any

equipment to the man working on a ladder. 37. Do not tie the rope on

rail without taking traffic block.



13

38. Ensure that working personnel should not

stand directly below a work spot under a ladder.

39. It is necessary to take traffic block while

working on tunnel or bridge. 40. Any contact with conductors which are not

specifically earthed is forbidden.



14

41. All messages relating to shut down and restoration of power supply, permits to work, etc. issued over the telephone shall invariably be supported by exchange of private numbers and repeated twice.



15

Private Sheet No. 42. Staff should not sit

under the ATD (balance weight).



1

B. SPECIAL PRECAUTION

TO BE TAKEN WHILE

ATTENDING

BREAKDOWN AT

SHARP CURVES



16

�� Plan Every Job.

�� Use the Right Tools for the Job

�� Isolate the Equipment

�� Minimize the Hazard

�� Protect the Personnel

�� Assess abilities of the personnel

EEEEDUCATE FOR THE DUCATE FOR THE DUCATE FOR THE DUCATE FOR THE AAAABOVE BOVE BOVE BOVE

PPPPRINCIPLES RINCIPLES RINCIPLES RINCIPLES FFFFREQUENTLYREQUENTLYREQUENTLYREQUENTLY

SAFETY PRINCIPLES



17

1. Issue caution order to the Loco Pilots of trains of adjacent line for affected section/ kilometers to stop and proceed with free whistling.

2. Take safety

precautions for working staff on affected line from passing trains of adjacent line/track by whistling, flags or portable loud speaker by TrD staff.

3. In outside curve for

slewing of OHE, 0.8 (¾) ton tirfor should be provided in catenary wire to prevent outside movement of catenary wire.



18

4. Before commencing the work, tension of contact & catenary wire should be released by lifting of ATD, if required

5. Use of old extension ladder having less

strength should be avoided.



19

6. Always provide

20/16 dia. GI bolt in step of ladder which is used for pull lift and extension step.

7. Ladder should be always allowed to fall on catenary wire towards the mast side in both curves for working.

8. Splice of contact

& catenary wire must be done by tower wagon.



20

10. In inside curve, during opening of swivel clip or adjustment of stagger/ removing swivel clip first release the load of contact wire pulling away from the mast by manila rope/ small tirfor 0.8 (¾) ton.

11. In out side curve, during opening of swivel clip first release the load of contact wire pulling towards the mast by manila rope/tirfor 0.8 (3/4 ton).

12. Lock anti- creep and additional providing PG clamp on catenary & anti creep wire, if half tension length is affected.



21

13. In OHE breakdown, if jumpers are found (‘G’

jumper, ‘C’ jumper, ‘F’ jumper) in tension condition, first take load by 1.5 ton pull lift/tirfor before opening the PG clamp. It may possibility of broken of catenary strands inside the PG clamp.

14. Avoid standing on roof of tower wagon

towards mast while opening swivel clip in inside curve.

Check PG clamp by Opening

Catenary strands is broken inside the PG clamps

‘Stop’ before opening the PG

clamp, first take the load of catenary

wire by 1.5T pull lift



22

15. On outside curve location when bracket

insulator breaks suspension assembly brackets comes down and bracket tube with remaining broken portion of insulator hangs to make an entanglement with pantograph (No feeder CB tripping in one case experienced)



23

�� NOTE NOTE NOTE NOTE



24

REFERENCE

1. Manual of AC Traction Maintenance and operation Vol. II (Part I) 1994.

2. Field study maintenance practices in various TRD depots.

3. Suggestion received during seminar held on 08th July 2011.



25

To upgrade maintenance technologies and methodologies and achieve improvement in productivity,

performance of all Railway assets and manpower which inter-alia would

cover reliability, availability, utilisation and efficiency.

OUR OBJECTIVE

If you have any suggestions and any specific Comments please write to us. Contact person : Director (Elect.) Postal Address : Indian railways

Centre for Advanced Maintenance technology, Maharajpur, Gwalior. Pin code – 474 005

Phone : 0751 – 2470740

0751 – 2470803 E-mail : [email protected] Fax : 0751 - 2470841



26

INDIAN RAILWAYS

Centre for advanced Maintenance TECHnology Maharajpur, Gwalior, M.P. 474 005

REMEMBER

WWWWE MUST BELIEVE E MUST BELIEVE E MUST BELIEVE E MUST BELIEVE

THAT LIFE IS THAT LIFE IS THAT LIFE IS THAT LIFE IS

VALUABLEVALUABLEVALUABLEVALUABLE

ONE CAN ENFORCE SAFETY IN

WORK PRACTICES, HOWEVER

A DEVELOPED CULTURE OF SAFETY

WITHIN THE ORGANIZATION IS

HELPFUL IN PREVENTING

ACCIDENTS.

egkjktiqj xokfy;j precaution to be taken...contact wire while working resulting kink form under...

Documents