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Topic Title: Earthing Conductor Installation / High Zs
Topic Summary:
Created On: 21 January 2019 08:53 AM
Status: Read Only
Linear : Threading : Single : Branch
 Earthing Conductor Installation / High Zs   - PWatts - 21 January 2019 08:53 AM  
 Earthing Conductor Installation / High Zs   - AJJewsbury - 21 January 2019 12:20 PM  
 Earthing Conductor Installation / High Zs   - gkenyon - 21 January 2019 01:56 PM  
 Earthing Conductor Installation / High Zs   - chrispearson - 21 January 2019 01:59 PM  
 Earthing Conductor Installation / High Zs   - OMS - 21 January 2019 02:35 PM  
 Earthing Conductor Installation / High Zs   - PWatts - 21 January 2019 03:56 PM  
 Earthing Conductor Installation / High Zs   - Alcomax - 21 January 2019 04:21 PM  
 Earthing Conductor Installation / High Zs   - PWatts - 21 January 2019 04:24 PM  
 Earthing Conductor Installation / High Zs   - Alcomax - 21 January 2019 05:37 PM  
 Earthing Conductor Installation / High Zs   - chrispearson - 22 January 2019 09:48 AM  
 Earthing Conductor Installation / High Zs   - AJJewsbury - 22 January 2019 11:01 AM  
 Earthing Conductor Installation / High Zs   - mapj1 - 22 January 2019 11:06 AM  
 Earthing Conductor Installation / High Zs   - John Peckham - 22 January 2019 11:06 AM  
 Earthing Conductor Installation / High Zs   - PWatts - 22 January 2019 04:21 PM  
 Earthing Conductor Installation / High Zs   - mapj1 - 22 January 2019 04:27 PM  
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 21 January 2019 04:24 PM
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PWatts

Posts: 5
Joined: 05 June 2015

Hi
Yes it has been measured a few times now using different instruments

Many thanks
 21 January 2019 05:37 PM
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Alcomax

Posts: 450
Joined: 12 November 2009

I don't know if replacing the joint would help solve this and it would be difficult to cut it out and remake it anyway.


So the position of the joint is known. Is the difficulty due to this being outside? I ask, as one solution that is being considered is installing an additional earthing conductor with the existing SWAs. This suggests any new conductor would also go through the ducts?

Taking a guess, was the 185mm the original cabling and the 120mm was added on later with the substation move?

There may be a compelling reason for proceeding with the "earth" fix and not actually attending to what has already been admitted as a likely "dodgy joint" , but is it likely that sooner or later someone is going to have to excavate the joint and repair?

Things could be easier for a solution if the position of the joint was under cover in a building or a small hut could be constructed above it. 120mm 4 core armour is fine as a cpc for 5 secs disconnection , BS6346/5467/6724.

185mm would also be fine IF it was the old bog standard BS6346 , but not the 5467/6724.

The above are rules of thumb / deem to comply. As others have said the adiabatic will determine. But I do not like the sound of the dodgy joint.

In an ideal world you would like to excavate, repair and reform in a new brick hut with an appropriate switch fuse disconnector.

But nothing is ideal in electrical installation land.
 22 January 2019 09:48 AM
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chrispearson

Posts: 1095
Joined: 15 February 2018

Just a thought: would FI have been more appropriate than C2?
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