MIG Welder- is a Seperate Supply Circuit Needed?

[TicklyT]

exactly how do you have a Metal Inert GAS welder without gas?????

You use a cored filler wire. The core vaporises to form a gaseous shield around the weld as the filler wire melts.

 

[ban-all-sheds]

But I would think that very likely a 16A plug would work OK with a D16 MCB protecting it.

It's a portable appliance - is there an EFLI limit for non-1363 sockets?

 

[ericmark]

But I would think that very likely a 16A plug would work OK with a D16 MCB protecting it.

It's a portable appliance - is there an EFLI limit for non-1363 sockets?

Since it has to be RCD protected the max EFLI is 200 ohms the Live - Neutral loop impedance will be far more important. For the magnetic part of the MCB to work one would need a L-N loop impedance of 0.7 ohms.
However I am not sure if we need to be able to use the magnet part of the trip? A fault causing over heating will trip the thermal part of the trip which will include a short circuit. What we now need to consider is the let through current and would this blow the main incoming fuse. For a D32 MCB I think this may be a worry but I would not thing there is much chance with a D16 MCB. My BS7671:2008 is not handy so I can't look at the charts to check and if I have got it wrong sorry.

So yes the let through current will need checking. But EFLI is really only a worry with sockets over 20A in Domestic as below that a RCD must be fitted.

 

[ban-all-sheds]

I am really not a fan of, and would always argue strongly against, what I consider the lazy bodge of using an RCD to get around the problem of excessive EFLI values on TN systems...

 

[Spark123]

So you'd pay the DNO to dig up the road so you can install your D16 MCB on a TN-S system where the Ze is perfectly acceptable at 0.6 ohms but your maximum measured efli is a mere 0.575 ohms?
In some circumstances I don't like the idea of using RCDs for excessive Zs but in some circumstances I don't see a viable alternative.
As long as the Zs figures are reasonable i.e. not massively over what I'd expect I'd let it run.

 

[ericmark]

I am really not a fan of, and would always argue strongly against, what I consider the lazy bodge of using an RCD to get around the problem of excessive EFLI values on TN systems...

I would agree but it does comply. I don't like to see twin and earth to me the flat cable is made flat to go in walls and trunking but it does not break regulations by clipping up a wall if out of harms way.
I would consider most DIY people don't know or care what EFLI is and will never measure it.

 

[ban-all-sheds]

Maybe I'm not most DIY people....

 

[RF Lighting]

It's a TT supply

 

[ban-all-sheds]

I knew that.

































































Now, where did I put my coat?....