60 amp single pahese 240 volt AC supply (UK)
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Posted by Chris on November 25, 2005, 9:30 pm
Please log in for more thread options I have bought a TIG welder that will run off UK 240 volt single phase 50 hertz AC supply, but on full power can draw up to 50 amps. I want to wire this off the house incoming mains distribution board, to a spur in my worksshop, about 30 feet away. The mains supply from the road is on a 100 amp fuse to the meter. The meter then feeds straight to a fuse switch with an 80 amp fuse in it. If I can get an extra pair of tails into the outlest of this switch fuse i was going to run armoured cable to a 60 amp switch fuse in the workshop, with the welder hard wired into that. Can anyone see a problem with this? I live in the sticks, and although the mains is fused 100 amp the incoming armoured cable form the pole looks quite thin... What core size armoured do I need to be looking at? BTW, a pic of the welder load plate is at ftp://ftp.chriswilson.tv/mig/mig.jpg Thanks. | ||||||||||||||||||||||||||||
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Posted by Charles Schuler on November 25, 2005, 6:37 pm
Please log in for more thread options Don't know about UK standards. Here (USA) we use the National Electric Code and if one modifies an installation without permitting and inspection, dire consequences can result ... as one example the refusal of an insurer to pay for damages ignited or initiated by an electrical fault. For 50 amps, one needs robust wiring (# 8 copper or # 6 ... depends on several factors). Also, the sub-feed must be protected with an over-current device properly sized to the wire size and the particulars of the load the installation. The means of disconnect might also be regulated ... even the location of the disconnect device. It can get complicated. Conduit might be required, for example. Don't rush into this. Check with your local authorities. You might need a permit and an inspection after installation to make it legal and to avoid future problems. | ||||||||||||||||||||||||||||
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Posted by pebe on November 26, 2005, 12:01 am
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I would agree with Charles. Give your local electricity board a ring. They will give you a definitive answer. | ||||||||||||||||||||||||||||
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Posted by Fermi on November 27, 2005, 1:14 pm
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On Fri, 25 Nov 2005 21:30:50 +0000, Chris wrote: > I have bought a TIG welder that will run off UK 240 volt single phase 50
> hertz AC supply, but on full power can draw up to 50 amps. I want to wire > this off the house incoming mains distribution board, to a spur in my > worksshop, about 30 feet away. This should be OK. You'll need a 50A MCB in the distribution board and cable with 8mm^2 or 10mm^2 cables. > The mains supply from the road is on a 100
> amp fuse to the meter. The meter then feeds straight to a fuse switch with > an 80 amp fuse in it. If I can get an extra pair of tails into the outlest > of this switch fuse i was going to run armoured cable to a 60 amp switch > fuse in the workshop, with the welder hard wired into that. Can anyone see > a problem with this? I'm not sure what you mean by "a fuse switch". Is this separate to the distibution board? I've seen some installations where the tails from the meter go to a switch which then supplies two distibution boards (in the case where the first distibution board didn't have enough connections). Anything after the meter is your responsibility. The meter and the distibution head (which has the 100A fuse) is property of the supplier (the fuse just protects their system should there be a fault on your property, it doesn't really increase safety). The key points are: The cable to the workshop must be rated for the application .Different cables will have different ratings depending on whether they are clipped to the surface of a wall or if they are enclosed in the wall or in conduit (where they are derated due to decreased ventilation). The cable must be protected by a circuit breaker (MCB) or fuse. This prevents the cable from overheating so the cable must have higher rating than the fuse/MCB that protects it. If the "fuse switch" is connected directly to the meter and you run cables from this you will neeed something like 16mm^2 or 25mm^2 cable as the only thing protecting the cable will be the 100A fuse. Your local library (if one exists) on town/city library may have a copy of the IEE 16th edition wiring regulations: http://www.iee.org/Publish/WireRegs/index.cfm The work you are intending to do falls under the new Part-P building regulations and will need approval from the local building inspector: http://www.partp.co.uk/consumer/consumer_diy.asp Various examples of distibution boards and cable: http://www.mkelectric.co.uk/PDF/technical/SENTRY_tech.pdf http://www.farnell.com/datasheets/64499.pdf http://www.tlc-direct.co.uk/Main_Index/Consumer_Units_Index/Contactum_Metalclad_Range/index.html http://www.tlc-direct.co.uk/Main_Index/Cable_Index/index.html http://www.tlc-direct.co.uk/Products/CA10Gslash50.html http://www.tlc-direct.co.uk/Main_Index/Cable_Index/Armoured_SWA/index.html -- F. Drop '.invalid' and remove 888 to reply by email | ||||||||||||||||||||||||||||
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Posted by Vanheesbeke Stefaan on November 27, 2005, 2:36 pm
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50 Amps on a two phase 240V mains looks a lot to me. Is this really a 12kW single phase welding device? > I have bought a TIG welder that will run off UK 240 volt single phase 50
> hertz AC supply, but on full power can draw up to 50 amps. I want to wire > this off the house incoming mains distribution board, to a spur in my > worksshop, about 30 feet away. The mains supply from the road is on a 100 > amp fuse to the meter. The meter then feeds straight to a fuse switch with > an 80 amp fuse in it. If I can get an extra pair of tails into the outlest > of this switch fuse i was going to run armoured cable to a 60 amp switch > fuse in the workshop, with the welder hard wired into that. Can anyone see > a problem with this? I live in the sticks, and although the mains is fused > 100 amp the incoming armoured cable form the pole looks quite thin... > > What core size armoured do I need to be looking at? BTW, a pic of the > welder load plate is at ftp://ftp.chriswilson.tv/mig/mig.jpg > > > Thanks. | ||||||||||||||||||||||||||||
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> hertz AC supply, but on full power can draw up to 50 amps. I want to wire
> this off the house incoming mains distribution board, to a spur in my
> worksshop, about 30 feet away. The mains supply from the road is on a 100
> amp fuse to the meter. The meter then feeds straight to a fuse switch with
> an 80 amp fuse in it. If I can get an extra pair of tails into the outlest
> of this switch fuse i was going to run armoured cable to a 60 amp switch
> fuse in the workshop, with the welder hard wired into that. Can anyone see
> a problem with this? I live in the sticks, and although the mains is fused
> 100 amp the incoming armoured cable form the pole looks quite thin...
>
> What core size armoured do I need to be looking at? BTW, a pic of the
> welder load plate is at ftp://ftp.chriswilson.tv/mig/mig.jpg