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Topic Title: Operation in RMU without equipment earthing
Topic Summary: Earth plate theft in 11 KV Distribution network
Created On: 01 June 2010 07:27 AM
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 01 June 2010 07:27 AM
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Badshah

Posts: 38
Joined: 22 July 2009

I just want to know whether it is safer to do operation in the RMU of 11 KV or 6.6 KV distribution system if there is no connection to the ground or earth? If earthing rod or plate found missing , what needs to be done, whether operation can be carried or not?Please suggest.

What will be the impact on the personnel & system, if there is a fault in the RMU?
 01 June 2010 10:56 AM
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ArthurHall

Posts: 735
Joined: 25 July 2008

No it is not safe to operate switchgear that is not earthed. If I found a unit that was not earthed I would put a 'do not operate live' restriction on the gear and shut it down and replace the earthing as a matter of urgency.
As well as connecting the gear to earth it is normal to run the earth conductor below the operators standing position, so that in event of a fault the operator is in an area with reduced step and touch voltages.
 01 June 2010 08:43 PM
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Backintime

Posts: 282
Joined: 11 April 2007

The contractor and the client who authorise carrying out any operation or the continuous use of the RMU that is not earthed could be prosecuted by the HSE.

You are best to ask HSE the question.

Regards

Marty
 01 June 2010 09:04 PM
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alancapon

Posts: 5745
Joined: 27 December 2005

The contractor and the client who authorise carrying out any operation or the continuous use of the RMU that is not earthed could be prosecuted by the HSE.

Or, they could be unlucky and be taken away from the site in a suitable box . . . .

Regards,

Alan.
 10 June 2010 06:46 PM
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iqbalkhan

Posts: 43
Joined: 26 January 2009

RMU is MV equipment and at this side high SC MVA is available so it is not advisable to operate like arthur mentioned it needs to be done on urgent basis
 11 June 2010 04:07 PM
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iansettle

Posts: 777
Joined: 20 September 2005

Originally posted by: alancapon

The contractor and the client who authorise carrying out any operation or the continuous use of the RMU that is not earthed could be prosecuted by the HSE.


Or, they could be unlucky and be taken away from the site in a suitable box . . . .



Regards,



Alan.


More likely a body bag.
 11 June 2010 04:22 PM
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alancapon

Posts: 5745
Joined: 27 December 2005

Originally posted by: iansettle
More likely a body bag.

Whether it is a body bag or a suitably large box, the effect is the same - they won't be doing it again.

Regards,

Alan.
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