S
shugs11
Working on a large commercial job, each floor has 2 lighting and 2 power boards and presumably others for mechanical etc. One of the RCBOs was noticed to be overheating/melting and was assumed faulty so changed. After a few days, melting again, so it was changed again. The next time it happened some clever chap thought it might be a good idea to investigate why.
What he found was 2 lighting circuits both on the same phase feed from different boards on the same floor, someone had accidentally put a link between between the 2 feeds.
One circuit was fed via a " C10 Type A single pole RCBO " ( which overheated )
The other circuit was fed via a " C10 Mcb " which was seemingly unaffected
When I quized him he couldn't be certain whether or not there was any load on either circuit but he had checked between the 2 boards on the phase concerned and there was no PD
I'm curious as to what exactly happened. Does anyone have any ideas ?
What he found was 2 lighting circuits both on the same phase feed from different boards on the same floor, someone had accidentally put a link between between the 2 feeds.
One circuit was fed via a " C10 Type A single pole RCBO " ( which overheated )
The other circuit was fed via a " C10 Mcb " which was seemingly unaffected
When I quized him he couldn't be certain whether or not there was any load on either circuit but he had checked between the 2 boards on the phase concerned and there was no PD
I'm curious as to what exactly happened. Does anyone have any ideas ?