Welding Machine connections caused earthing cable damage
Welding Machine connections caused earthing cable damage
(OP)
We have a welding Machine Rated input Voltage 400 Volt (single Phase), 32.2 KVA, 81 A , but we have not 400 Volt single phase, then Electrical Technician connected it as two phase 415 volt, they used this machine for long time at work shop to weld workpieces on Metal table without ground " isolated" with power supply 415 V , two phases in safe condition, however they used this machine at site to weld pipes inside cracker Furnace, they put the current return clamp at earth rod at ground floor and the welding current cable at the pipe "workpiece" inside the furnace at second floor (the furnace already earthed), then once started welding after minutes the ground cable of the machine and the source ground cable burnt.
Please can you explain why earth cable burnt
Please can you explain why earth cable burnt





RE: Welding Machine connections caused earthing cable damage
RE: Welding Machine connections caused earthing cable damage
Obviously the welding return cable was not properly connected to a low resistance return path so it selectively chose the machine earth wire. A very common occurance in welding shops where the welding person suffers from sleep deprivation or ADD.
RE: Welding Machine connections caused earthing cable damage