Ring Mains

strummer · 21 Mar 2005

Am I correct in assuming that both ends of a ring main should be supplied from the same MCB. Logic tells me that this has to be so.

Am I also correct in assuming that an MCB should feed one and only one ring main ??

The installation is further complicated in that night storage heaters could have been supplied at one point. That being the case what would a blue MCB (16A) have been used for.

ban-all-sheds · 21 Mar 2005

strummer said:
Am I correct in assuming that both ends of a ring main should be supplied from the same MCB. Logic tells me that this has to be so.

Absolutely yes.

Am I also correct in assuming that an MCB should feed one and only one ring main ??

Yes

The installation is further complicated in that night storage heaters could have been supplied at one point. That being the case what would a blue MCB (16A) have been used for.

Night Storage Heaters?

theshogun · 21 Mar 2005

Am I correct in assuming that both ends of a ring main should be supplied from the same MCB. Logic tells me that this has to be so.

Yes

Am I also correct in assuming that an MCB should feed one and only one ring main ??

Yes a 32 amp MCB normally

Night storage heater are normally wired on separate circuits backed by a 16 amp MCB ,these are normally in a separate cu, to the normal house circuits cu ie, lights,sockets,cooker etc.
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edited to correct quote

strummer · 21 Mar 2005

Thanks alot. That was exactly what I wanted to know, but I might be back.

plugwash · 22 Mar 2005

strummer said:
Am I correct in assuming that both ends of a ring main should be supplied from the same MCB. Logic tells me that this has to be so.

as already said ABSOLOUTELY YES

strummer said:
Am I also correct in assuming that an MCB should feed one and only one ring main ??

Ideally yes but theres nothing dangerous about doubling them up it just means you are limited to 32A total acrross the two rings.

strummer said:
The installation is further complicated in that night storage heaters could have been supplied at one point. That being the case what would a blue MCB (16A) have been used for.

usually used for dedicated appliance cuircuits for appliances up to just over 3KW or single socket cuircuits that used to be dedicated appliance cuircuits. The appliances in question are usually those that draw power for extended periods such as fixed space heaters (both direct and storage) and immersion heaters.

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Ring Mains

strummer

ban-all-sheds

theshogun

strummer

plugwash

DIYnot Local

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