ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Linear Power Supply Quits Under Load
by JoeTestingEngr. 10/18/18 08:47 PM
220/230/240V 60Hz Systems
by dsk. 10/17/18 01:25 PM
PLC/HMI Enclosure C2, D1
by ghost307. 10/16/18 03:31 PM
Tingle off the water spigot
by dsk. 10/15/18 02:36 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
1 registered members (JoeTestingEngr), 18 guests, and 35 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Welders service Calculations???? #174813
02/14/08 11:05 AM
02/14/08 11:05 AM
Y
Yoopersup  Offline OP
Member
Joined: Mar 2003
Posts: 849
Michigan
(13) 480 volt three phase. Spread around a 100000 sq. ft Plant for maintance. Motor generator type. 60 amp plug ins no info on welders at this time. What would the load you"d have to figure for the service be??
Would it be 630.11 (B).
Also if you jumped from welder to welder say 3 in a row.
Wire size & Breaker size??
Kinda Got a IDEA but never to proud to ask.
Yoopers

2017 / 2014 NEC & Related Books and Study Guides
Re: Welders service Calculations???? [Re: Yoopersup] #174889
02/16/08 03:20 PM
02/16/08 03:20 PM
G
George Little  Offline
Member
Joined: Jan 2004
Posts: 1,489
Michigan USA
Ernie— Kinda tough to give wire and breaker size with no known specs. I don't know what you are suggesting when you say jump from welder to welder. I would say that 630.11(B) is the article for calculating the supply conductors and the load for the Service. At least that's how I'd call it. Bearing in mind all conductors must be protected at their ampacity per 240.4 and then there is the provision in 240.4(G) for welders. I've never been real comfortable with the fusing on conductors for welders but that's what it says and I guess there is a good track record. I know, let's ask the Design Professionals that question. I don't know what they will say since their kinda quiet on this issue.


George Little

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Niko
Niko
Campbell, CA
Posts: 356
Joined: August 2006
Show All Member Profiles 
Top Posters(30 Days)
sparky 11
Popular Topics(Views)
250,521 Are you busy
188,080 Re: Forum
177,717 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.021s Queries: 15 (0.005s) Memory: 0.9436 MB (Peak: 1.0628 MB) Zlib enabled. Server Time: 2018-10-21 04:41:11 UTC