industrial welder. any advice

[Knobhead]

Yep, I recently had a call out because a welder had set the cpc on fire in the DB and it even made the trunking rattle, lol. I repaired the circuit and offered to check the welder to make sure it was wired correctly but they thought it was dangerous so the had ditched it before I got there...

Welding sets have been the bain of my life, more correctly idle welders who can’t be bothered with the return.

Cables on fire, bearings seized, you name it, they can bugger it up!

 

[davesparks]

Being back acetylene welding, that won't bugger your earth wires up!

 

[plugsandsparks]

Being back acetylene welding, that won't bugger your earth wires up!

May sound a little sad, but when I was a lad, I did spend some time in the welding shop ONLY because I was fascinated by the cutting torch and how good the welders were at cutting thick plate. Anyway when I eventually got them to let me do some cutting I was ecstatic, can still remember the day....

 

[davesparks]

May sound a little sad, but when I was a lad, I did spend some time in the welding shop ONLY because I was fascinated by the cutting torch and how good the welders were at cutting thick plate. Anyway when I eventually got them to let me do some cutting I was ecstatic, can still remember the day....

Ive got some of my grandad's oxy torches in the shed, he was a diesel fitter working on mining machinery and trucks etc in australia. theres a normal size cutting torch, straight torch about 2' long and a circle cutting guide to hold the big torch and cut perfect circles.
Some of the other gems he's passed on include a 3 legged puller which could have a role in war of the worlds and an 1" drive socket set.

Anything I have no use for or don't want gets donated to charity

 

[Davey1988]

Any advice on where best to research welders. As yous say noT bs7671

Cheers fellas. I'm having a debate at work and I advise they oversized the phase cables (ain't disputed the cpc as that's what I'm working out lol)

 

[davesparks]

Any advice on where best to research welders. As yous say noT bs7671

Cheers fellas. I'm having a debate at work and I advise they oversized the phase cables (ain't disputed the cpc as that's what I'm working out lol)

Why oversize the phase cables? the correct size cable will do the job fine

 

[Davey1988]

That's why I'm trying to research a little first before I look like the noob. Which I am but.... its 80 amps per phase and they want to install a 70mm cable capable of carry 196 amps per phase. (Only thing I can assume is to gain a 35mm earth cable Which may be required. That's why I'm wanting a little advice

 

[davesparks]

That's why I'm trying to research a little first before I look like the noob. Which I am but.... its 80 amps per phase and they want to install a 70mm cable capable of carry 196 amps per phase. (Only thing I can assume is to gain a 35mm earth cable Which may be required. That's why I'm wanting a little advice

CCC isn't the only consideration when selecting a cable.
Are you actually a qualified electrician?

 

[Davey1988]

Never said it was. I've worked out 36mm earth cable required. But don't understand the phases. Probs convience.

 

[davesparks]

Are you responsible for designing this circuit?

 

[davesparks]

Never said it was. I've worked out 36mm earth cable required. But don't understand the phases. Probs convience.

Assuming that is copper you have worked that out for then you'll obviously have to use 50 mm

 

[Davey1988]

Someone else designed it. I'm trying to understand it.

They specified 70mm. 35mm copper.

I have to install it and I think it's way to big.

 

[Davey1988]

K value 46
zs .31
voltage 415
Diss connection time required 5 seconds.

 

[davesparks]

Someone else designed it. I'm trying to understand it.

They specified 70mm. 35mm copper.

I have to install it and I think it's way to big.

If a designer has specified it then that is what you install, it's their name on the paperwork and their neck on the block if it's wrong.

 

[davesparks]

K value 46
zs .31
voltage 415
Diss connection time required 5 seconds.

Length of circuit, max permitted Zs, inrush current, power factor, max permitted VD, ambient temp, installation method, type of cable, conductor operating temperature?