Welding power Source Voltage

Date 06-08-2003 15:46

Could you please advise the logic behind permitting the welding machines with an Open Circuit Voltage (OCV) of 95 VDC (In certain machines like LINCOLN SAE 400, etc. is about 105 VDC), while there are restrictions for the AC auxiliary power?
- They shall not be more than 55V from the ground.
- In certain areas, they shall be protected with RCCB.

Please help

By Arcandflash (**)

Date 06-09-2003 01:20

My guess would be that the welding outputs are considered to be a case where the operator is supposed to understand what he is doing and taking precautions whereas the auxillary power could be used for any consumer items and/or in a casual environment. ("Can we use your machine to power our lights and amplifiers for the family picnic?") This now comes into the realm of electrical wiring with all of its codes and rules.

RCCB are probably a good idea for any powered stuff used outdoors anyway and are required in some jurisdictions. Don't know about the 55V unless that is a maximum permitted common mode voltage dictated by alternator insulation/design.

Just my take on the situation.

Bill