Ferrous enclosure termination example

Mr Malcontent said:

Hello all, visit to site today to see in an install of a 315A 400V supply to a machine. Client mentioned previously they were going to use single core AWA cables from the distribution board to the machine so I advised them amongst other things to factor reg 525.1 and how they terminate the individual conductors into any ferrous enclosures.

So, turned up today to find a separate 4 pole 947-3 isolator installed in a steel enclosure separate to the machine, conductors installed as per photos. The gland plate has been replaced with what looks to be a stainless steel plate and the outgoing conductors terminated directly onto the top horizontal section of the steel enclosure through compression glands! The outgoing conductors are then installed to a length of cable tray along the wall and into the base of the control panel through a slotted gland plate.

I am lost for words?

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Mr Malcontent said:

advised them amongst other things to factor reg 525.1 and how they terminate the individual conductors into any ferrous enclosures.

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westward10 said:

You sure that isn't aluminium plate in the first two pics.

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buzzlightyear said:

looks like the bottom plating is existing .

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Mr Malcontent said:

No didn’t tell them how to install it, just advised them to be aware of the factors when installing singles into ferrous enclosures and to ensure they comply with applicable regs.

I didn’t have a magnet to hand to be honest but I thought the plate looked aluminium, the manufacturer of the control panel was still on site and he thought maybe stainless. Unfortunately the electrical contractor responsible for the supply was not on site today to ask.

Going back in the morning when I’ll have more time to investigate.

Surely the conductors terminated directly into the enclosure without the gland plate are susceptible to electro magnetic effects? This I can’t fathom why he used a ferrous box?

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westward10 said:

Up my street that sort of install and so easy to do a neat job.

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westward10 said:

Those outgoing conductors aren't rated for 315A.

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Mr Malcontent said:

No didn’t tell them how to install it, just advised them to be aware of the factors when installing singles into ferrous enclosures and to ensure they comply with applicable regs.

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Mr Malcontent said:

Unfortunately the electrical contractor responsible for the supply was not on site today to ask.

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