J
jclarke4
Hi,
In an installation there are 6no. Eurarc 420 welders supplied from dedicated 40Amp single phase RCBO's housed within a dedicated distribution baord. The welders can be operated as either single or three phase via a selector switch. The current arrangement is single phase with ABB 32A plug/socket connections. The rated max load in single phase is 93Amps. The users of the welders only use up to 3.25mm electrodes which the manufacturer tells me that using these types of electrodes would only use max of 35Amps.
The RCBO's are 30mA C type and keep tripping out once welding commences. It will be a big job not to mind expensive to change out to hard wired connections via isolators and MCB's so I was proposing to change the RCBO's to D or even K type as the issue may just be in-rush current but I suspect that there may be a problem with earth leakage.
Anybody any thoughts???
John.
In an installation there are 6no. Eurarc 420 welders supplied from dedicated 40Amp single phase RCBO's housed within a dedicated distribution baord. The welders can be operated as either single or three phase via a selector switch. The current arrangement is single phase with ABB 32A plug/socket connections. The rated max load in single phase is 93Amps. The users of the welders only use up to 3.25mm electrodes which the manufacturer tells me that using these types of electrodes would only use max of 35Amps.
The RCBO's are 30mA C type and keep tripping out once welding commences. It will be a big job not to mind expensive to change out to hard wired connections via isolators and MCB's so I was proposing to change the RCBO's to D or even K type as the issue may just be in-rush current but I suspect that there may be a problem with earth leakage.
Anybody any thoughts???
John.
