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PostPosted: Wed Nov 07, 2018 5:49 pm 
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I have a new machine for DIY that requires a 16amp supply. I have a 240v supply to my garage (amoured cable) to a metal distribution box with MCBs, one of which is spare.
Can I add a new 20/30 amp MCB to this box and then run a new supply cable from this to a 16amp socket outlet to plug the machine into...? :shock:


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PostPosted: Wed Nov 07, 2018 6:01 pm 
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not a issue as long a the supply is up to the job and you use the correct plug and socket designed for 16 amp

most welders are fine on a 13 amp socket as long as your not pushing the ampage and or duty cycle*


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PostPosted: Thu Nov 08, 2018 7:49 pm 
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It would be more traditional to fit a 16A MCB for a 16A supply.


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PostPosted: Fri Nov 09, 2018 4:17 am 
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Can I legally, or following regulations, or physically what is the question?

Legally if the garage supply comes from a domestic supply then Part P covers it, so depends on where you live, but in general it would seem your installing a new circuit so would would require registration and fee paying, or get a scheme member to do the work.

Regulations no problem in you doing work, but you do need to ensure there is a large enough supply to start with, and I would say 16A socket needs 16A MCB. If using something with inrush or start load, some DNO's will object if it causes a supply voltage dip, however it really needs some one to complain, other wise they don't care. You may need Type C or D MCB to stop it tripping with inrush or start load.

Physically we I don't know your ability.

Do remember we can all make mistakes, so filling in an installation certificate even if it goes in the bin after is a good way to prompt one into doing the required inspection and testing to highlight errors. And should some thing go wrong, it shows you had the skill and it was a genuine error not poor workmanship.


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PostPosted: Fri Nov 09, 2018 10:27 am 
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another thought
what is the total distance involved as this is fairly crucial with high loads due to volt drop :dunno:

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PostPosted: Fri Nov 09, 2018 1:38 pm 
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I know there is no point, however I have seen a supply from a FCU going to a CU in garage, and my shed has SWA but only 1.5 mm there is simply not enough info or even why it needs a 16A socket, I have a 16A socket in my garage even when whole supply is only 13A so I can plug in the caravan, which only has the battery charger switched on.


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