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Topic Title: Earth Leakage Protection Setting for Arc Welder
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Created On: 04 March 2014 08:18 AM
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 04 March 2014 08:18 AM
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jackdaniel

Posts: 69
Joined: 29 November 2012

Dear Experts,

What is the sensitivity setting for arc welding machine for current rating 100A, 3P. I don't think 30mA is suitable.
 04 March 2014 12:49 PM
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AdrianWint

Posts: 262
Joined: 25 May 2006

Why do you feel that such a machine even needs earth leakage protection?
 04 March 2014 01:22 PM
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Avatar for OMS.
OMS

Posts: 19473
Joined: 23 March 2004

The supply to the welding set may require RCD protection depending on how it is connected, and where it is used.

For a large, static set, RCD protection isn't a specific requirement, but if you expect it to prove additional protection for users, then only a 30mA device is applicable. You could have a higher triping value if you want protection say from fire or similar. That said, a 100mA or 300mA device will still offer a lot of protection to users.

An RCD won't be of any use to prevent shocks on the workpiece side of the welder - you need proper procedures and use of PPE for that.

Regards

OMS

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