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Discuss Limited Space For Out building supply in the Electrical Forum area at ElectriciansForums.net

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Hi all,
I am looking a installing a new supply to an out building, but very limited in space in electrical cupboard.
Could you use a double pole mcb in place of a switched fused disconnect ?

If not could you please enlighten me as to why.

Thanks all.
 
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Pete999

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Hi all,
I am looking a installing a new supply to an out building, but very limited in space in electrical cupboard.
Could you use a double pole mcb in place of a switched fused disconnect ?

If not could you please enlighten me as to why.

Thanks all.[/QUOT
Not in your CU because the CU will be single pole so a DP wouldn't compute
 

davesparks

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very limited in space in electrical cupboard.
Could you use a double pole mcb in place of a switched fused disconnect ?

If not could you please enlighten me as to why.

Thanks all.
How big is the incoming supply and the new supply you are installing?
Possible reasons for choosing a fuse over an MCB are a high level of fault current or the need for discrimination.

Why do you need the DP MCB?
 

SparkyChick

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The problem with using MCBs upfront like that is discrimination, sorry... selectivity.

When you say space is limited, how much room do you have available? A picture may help.
 
  • Thread Starter Thread Starter
  • #7
It will be a SWA our going. It’s the standard electrical cupboard on the outside of house. It will be straight from a Henley Block in 25mm2 to MCB then out in 16mm2 canny get a switch fuse with 40A fuse.
 
  • Thread Starter Thread Starter
  • #11
Don’t think you can get 40A fuse for KMF type switch and it’s a 10k braking capacity on the MCB so should ok as fault curren on site is only 4.8k
I’ll have a look when I’m back on site to see if I can fit a larger DB in
 

Midwest

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Allegedly the DNO's don't like you putting your stuff in 'their' meter cupboard. Bit like fake Earth Moon landings or the Flat Earth. Could enquire with them though.
 
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