I thought that was clear enough to make the point.
Earthing a metal container
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I thought that was clear enough to make the point.
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I must say that I did not find what you wrote to be in any way ambiguous. However, having said that, I knew what you meant (since I had written essentially the same) - so I suppose it's possible that it would not have been as totally clear to someone who didn't know?
Kind Regards, John
I concur. It would need the RCD protection, or provide some reinforced protection to limit damage to the cable. With a metal CU, the glands for tails and tail clamps achieve this. As for the container, you would need to protect the cable somehow.
RCD would be the best method.
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The supply shouldn't be T&E, even on a catenary. It is not suitable for installation in direct sunlight, nor where there may be movement.
The cable may degrade and is attached to a supposedly metal catenary wire, personally if they refuse to change it I'd run a mile!!
The cable may degrade and is attached to a supposedly metal catenary wire, personally if they refuse to change it I'd run a mile!!
I think I may need some education .... Do I take it that it's just the semantics which are confusing me, since I don't see that the feed cable would, per se, need any protection against the consequences of it "somehow coming in contact with the container" - since the greatest current one could realistically expect to be able to get down a domestic earth rod ('single figure' amps) would do no harm to 10 mm² T+E.
The concern presumably is that contact between L of the feed cable and the container (assuming it was bonded to the TT MET, or even just incidentally earthed) would result in the container (and TT electrode) rising to a high potential relative to true earth, without any protective device operating. Whilst, given adequate bonding, that should not be a hazard to those within the container, it could, of course, be a potential hazard to those touching the container from outside. The greatest worry is probably that such a fault to could persist undetected for a long time - and, as you say, an RCD is probably the simplest way to prevent that.
Am I talking/thinking sense?
Kind Regards, John
Having attended to a cabin that had become live due to questionable installation practices which allowed exactly that to happen, its an important consideration, especially as the environment in which a site cabin is likely to be situated means it is at perhaps greater risk of damage.
In an upshot, yes!
You wouldn't want to be trying to enter the container with it at 230v wrt mother earth!!
Exactly as your last paragraph. It could sit at or near to 230v indefinitely.
My if was meant to be or.
Thanks - so am I right that it was just the semantics of "the need to protect the cable somehow" which was confusing me?
Kind Regards, John
It seems that it was "or" by the time I saw it
It still is
There is always the 'Edit' button
Oh, now that is confusingIt still isIt seems that it was "or" by the time I saw it
. I assumed that his 'corrective comments' referred to his post about 2 minutes previously (which did contain an "or" when I saw it - probably always did!), not an earlier post!Kind Regards, John
Must admit, I thought the edit button was time locked. It won't edit quotes anyway, which gets even more confusing.It seems that it was "or" by the time I saw it
It still is
There is always the 'Edit' button
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