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and all the cores of the swa are used?
Discuss Earth Cable To Sub Distribution Board. in the Commercial Electrical Advice area at ElectriciansForums.net
dont forget the earth has to withstand fault current without failing so this is regardless of the max current demand of the board. I would also re-read my last post regarding earthing the armoured; its not a choice it has to be done regardless but as long as the supply end of the armoured is correctly earthed then you are not commited to doing the load end unless you are using the armouring as part or all your earth path, if you can get a DNO style earthing clamp fitted at the supply end then all you need to to correctly terminate the load side and you have effectively earth up the armouring and it can be used to back up the 35mm earth.
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You are correct Rob but was refering to the OP's situation, if i start detailing all the exceptions etc il be writing a novel on here im trying to give enough to work with without adding confusion.
Yes agree looking from a 3rd person point of view i see where your coming from and probably was worth a mention as you have kindly doneI do realise, just without knowing the environment the op works in, I wanted to point out that there are exceptions. 95% of the time your advice given above will be correct it's up to the op/ whoever reads this in the future to decide whether it's applicable to them.
The swa is passed into the panel at one through a 50mm brass bush. I considered this OK under the circumstances as:
1. I would never have been able to fit a cw gland
2. the cable has no chance of moving as it is under ground, well supported, will never move and completely protected from people and elements.
My only concern is the size of the CPC, it is 35mm sq and the rule of thumb is half the size of live conductor. I do think the cpc is sufficient but I would be happier if it was say 50mm sq. So, my original question was - can an earth rod be installed near a new db to compensate for the undersized cpc?
Reply to Earth Cable To Sub Distribution Board. in the Commercial Electrical Advice area at ElectriciansForums.net
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