Welders

Status
Not open for further replies.
D

djtazjr

Member
When sizing over current for welder and looking into article 630, what is the proper way?

Say you have three Arc welders with different primary currents; 230 voltage and 70,86 and 75 amps respectively.

The article is confusing to me and I would like help with this please.

:)
 
Re: Welders

djtazjr, In your post for the welders you listed,you left out any information on "Duty Cycle",so I'll figure them all at of 100%,by table 630.11(a),Arc Welders:
welder one: 86 amperes
welder two: 75 amperes
@100%=161 amperes
welder three
70 amperes x 0.85=59.5 amperes

232.5 total= 233 amperes
OCP,630.12(b)

[ January 04, 2005, 12:05 AM: Message edited by: dillon3c ]
 
Re: Welders

Ok Dillon I am new to this area so bare with me.

The duty cycle for the welder was 30% @ 80 I believe I and a little confused about that.

The other welders were the same but I was throwing numbers out to see if I get a reply.

But if I have you attentions can you help me further?
:D
 
Re: Welders

So one welder is 80 amperes,w/ duty cycle of 30% and other two welders are 75 amperes and 70 amperes @ 100% ?
 
Re: Welders

Yes the first welder is correct.

I called the warehouse and they informed me that the others are 70amps @ 40% and 90amps @ 30.
 
Re: Welders

djtazji,I understand,not something I calculate in every-day life either:lets run some #'bers
welder one:86 amps @80% duty x 0.89=76.54
welder two:75 amps @90% duty x 0.95=71.25
welder three:70 amps @70% duty x 0.84=58.8
630.11(B)welders(1&2)- 76.54 + 71.25 @100%=147.79 amps
welder(3)- 58.8 x 0.85= 49.98 amps
total=197.77=198 amperes
 
Status
Not open for further replies.
Top