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navneet311
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Join Date: May 2012
Posts: 12

Lighting Layouts

05/30/2012 4:30 AM

Can we use 100A mccb whose incomer is 63A mccb ?

Can we use 100A BUS for 32A mccb incomer?
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

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#1

Re: LIGHTING LAYOUTS

05/30/2012 6:39 AM

Is the proposal compliant with British Standard 7671?

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navneet311
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#2
In reply to #1

Re: LIGHTING LAYOUTS

05/31/2012 1:23 AM

ya proposal compliant with British Standard 7671...
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PWSlack
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#3
In reply to #2

Re: LIGHTING LAYOUTS

05/31/2012 3:29 AM

Then the question need not arise.

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silverfox
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#4

Re: Lighting Layouts

05/31/2012 12:17 PM

You can but its not a good solution.

In the event of a fault the incomer (63A) will trip before the 100A MCCB. If the incomer is feeding other circuits they will trip rather than your 100A MCCB. Your circuit will be limited to 63A.

A 100 or even 200A bus is usual in a distribution board. Feed it from 32A and thats the maximum you can get from it. Above 32A your MCB will trip. (eventually and all of that stuff in accordance with I²t curves)
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navneet311 (1); PWSlack (2); silverfox (1)

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