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A3 Radial


m4tty

Question

Hi,

If installing an A3 Radial, 32A MCB 4mm cable is the only reference method C available as if installed in conduit or trucking (ref B) the 4mm will only carry 30A so this is not allowed. As CCC must be equal to or more than B32 breaker ???

True or False

Thanks in advance

Matt

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15 answers to this question

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How much you betting? I have faith in our little vetspark:)

I thought he was a ELECTRIVET?

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My radials are all on 20A breakers

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Hi,

If installing an A3 Radial, 32A MCB 4mm cable is the only reference method C available as if installed in conduit or trucking (ref B) the 4mm will only carry 30A so this is not allowed. As CCC must be equal to or more than B32 breaker ???

True or False

Thanks in advance

Matt

Yes, this is true so to meet regs you would be looking at 6mm on a B32. Would be fun getting two of those into a socket!

Maybe there's a need for an MCB rating between 20 and 32.

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You mean like the 25A available for Comm / Ind premises? Good idea

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You mean like the 25A available for Comm / Ind premises? Good idea

Denmans were stocking 25A for their Steeple range.

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Nah - that sounds like one of those things you stand hot pans on; that has a light on it to find it in the dark.

You know - an electric trivet.ROTFWL

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hager do C25amp MCBs, should be too much trouble meeting the max Zs on most radials.

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Technically, you shouldn`t. There is a reference to it, somewhere, but it escapes me at present.

That said, I have done in the past, and probably would again.

As long at it fits the busbar correctly :)

KME

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with you on that one KME, i have done and will do again if other options are limited, it is certainly against manufactures instructions.

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I thought there had been a thread on this but I may have dreamt it.

Batty

There was

http://www.talk.electricianforum.co.uk/showthread.php?t=4216

Can people please take care when naming threads if they ever want me to find them again.............

:D

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How much you betting? I have faith in our little vetspark:)

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