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17m x 15m Car Enthusiast Domestic Garage
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<blockquote data-quote="Drumtochty" data-source="post: 537170" data-attributes="member: 35881"><p>The garage is 17 mtrs x 15 mtrs in the UK</p><p></p><p>The house has a 100 amp supply to the house consumer unit.</p><p></p><p></p><p>The garage consumer unit is fed from a 63amp RCD to a 40 amp B rated mcb in the house consumer unit.</p><p></p><p>The feed cable to the garage is 10mmsq SWA 3 core with the swa bonded to the earth conductor at both ends via the earth bar on the consumer units.</p><p></p><p>The garage consumer unit has a 100 amp main switch with two 63 amp RCD's which in turn feed 4 mcb ways each.</p><p></p><p>All the lighting is by LED with a load around 2 amps.</p><p></p><p>The garage is heated via an oil burner using less than 1 amp of electricity to run the burner controls.</p><p></p><p>There is a 3kw air compressor fed via a 20 amp B rated mcb in the garage consumer unit via 2 mtrs of 2.5 twin and earth with no issues.</p><p></p><p>There is a car lift fed via a 32amp b type b mcb via 15 mtrs 2.5 twin and earth.</p><p></p><p>The question I have is about sockets.</p><p></p><p>The garage has an internal area of approx 255 sq mtrs</p><p></p><p>The guidance in the UK tends to be to use a ring circuit for sockets with a max floor area of 100 sqmtrs per ring.</p><p></p><p>Therefore going by that guidance, it suggest that we have three ring circuits 5.7 mtrs wide by 15 mtrs deep via 32 amp mcbs but I am thinking of reducing the mcb rating to say 20 amps. Run with 2.5 twin and earth. </p><p></p><p>The main reason I am doing this is to prevent the owner who thinks he knows better and has no interest in keeping to any electrical regulations.</p><p></p><p>Does anyone have any issues with what is proposed.</p></blockquote><p></p>
[QUOTE="Drumtochty, post: 537170, member: 35881"] The garage is 17 mtrs x 15 mtrs in the UK The house has a 100 amp supply to the house consumer unit. The garage consumer unit is fed from a 63amp RCD to a 40 amp B rated mcb in the house consumer unit. The feed cable to the garage is 10mmsq SWA 3 core with the swa bonded to the earth conductor at both ends via the earth bar on the consumer units. The garage consumer unit has a 100 amp main switch with two 63 amp RCD's which in turn feed 4 mcb ways each. All the lighting is by LED with a load around 2 amps. The garage is heated via an oil burner using less than 1 amp of electricity to run the burner controls. There is a 3kw air compressor fed via a 20 amp B rated mcb in the garage consumer unit via 2 mtrs of 2.5 twin and earth with no issues. There is a car lift fed via a 32amp b type b mcb via 15 mtrs 2.5 twin and earth. The question I have is about sockets. The garage has an internal area of approx 255 sq mtrs The guidance in the UK tends to be to use a ring circuit for sockets with a max floor area of 100 sqmtrs per ring. Therefore going by that guidance, it suggest that we have three ring circuits 5.7 mtrs wide by 15 mtrs deep via 32 amp mcbs but I am thinking of reducing the mcb rating to say 20 amps. Run with 2.5 twin and earth. The main reason I am doing this is to prevent the owner who thinks he knows better and has no interest in keeping to any electrical regulations. Does anyone have any issues with what is proposed. [/QUOTE]
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