Attaching 13A plug on 20A appliance safety

[Deleted member 26818]

LOL. And you think that enhances your argument? Let's be honest - that forum is largely inhabited by the clueless and the clinically insane.

You are not the only member there.

 

[Deleted member 26818]

You are not the only member there.

True though.

 

[Risteard]

the IET Forum

"LoL - Diversity in action - or possible small overloads of long duration, depending on your viewpoint

Regards

OMS"

So the small overloads of long duration scenario has actually been raised to you before, ergo I am not the only one to ever question the practice.

 

[Deleted member 26818]

No, that was just a comment made by OMS, not a response to anyone in particular, and not even a factual statement.

 

['mr2'gd4u]

Alright agree to disagree, not worth an argument is it.

 

[alasdairp]

I believe that the maximum flex size for a 13amp plug top is 1.5mm

where is that stated? Manufacturer data sheet or some BSI or similar document? Thanks.

 

[alasdairp]

I have used a similar welder (with c. 2.5 mm^2 stranded wire) with an old strong MK 13A plug on it since the mid-1970s in a variety of places, thin and thick welding rods, and sockets. It has always worked and neever blown the (correct 13A) fuse in the plug. The high-current loads do not last for long. I would just do that - BUT - I would also weld for say 10 minutes and the unplug it and feel the plug legs to see how warm they have got. You need a solid plug and a quality socket or they could easily overheat.

 

[Risteard]

where is that stated? Manufacturer data sheet or some BSI or similar document? Thanks.

BS 1363

 

[LeeH]

If the 13A plug will fit the cable, then there should be no problem.
It’s only when you start welding thicker material that you’ll find the fuse blowing.

Give me enough time and incentive, I’d just about squeeze a 4mm2 into a plug top.

It’s not the rule of thumb I would recommend personally.

 

[tudore]

I also have a welder that can draw up to 30Amps. As it was only required for thin (vehicle) welding I fitted a 13A plug, and have used it without a problem for several years. It is always used on a long extension so there will be lower voltage and subsequently higher current than a direct feed.
I have been a qualified spark for 10 years, but prior to that I had experience in electronics / medical sciences / tinkering for 2 decades. I also did a welding course 30 years ago, which is something you probably haven't considered. Provided you don't try welding angle iron, I doubt you'll have a problem with the electrical supply. But please do remember to clear the area of any combustible material, and preferably have a fire extinguisher (CO2) handy, or at very least an old towel in a bucket of water!

 

[Deleted member 26818]

Powder extinguishers make a right mess.

 

[tudore]

Powder extinguishers make a right mess.

Exactly why I only mentioned the alternatives, but it is probably a good idea to state they are a bad idea. I don't believe that there is a risk of the wiring catching fire: the socket will be fed by 2.5mm, and the lead is 4mm, so a 13A fuse will blow well before either of these melts. The precautions against fire were for the benefit of a first-time welder, who may be so concerned about the fuse blowing that they forget the second main danger is from sparks setting fire to the place. (The main danger being electrocution by simultaneous contact with work-piece and feed).