A colleague was called to a loss of supply this morning, attended soon after our starting time and found a house with the 100A cut-out fuse blown, and no evidence why.
Customer stated they had gone to bed last night with the supply OK and got up this morning to no supply.
So being a careful guy he switched all the MCBs and a RCBO in the Ashley CU to off
Switched the incomer to the CU to off
As a precaution he fitted some 5A fuse wire to the cut-out fuse carrier and wearing the necessary PPE put the fuse carrier back in.
All seemed fine
Switched the CU main switch to on and BANG, big BANG as the fuse blew
After a careful inspection he decided to try again, with the same result.
But this time inspection showed some evidence of blackening on the CU in the vicinity of a 32A RCBO (an old type as it took up 2 spaces on the CU)
Against the rules, but that's what we do guv, he disconnected and removed the RCBO and was then able to restore all other supplies. As he left the customer was arranging to have the CU replaced.
So watch out for some older RCBOs
Customer stated they had gone to bed last night with the supply OK and got up this morning to no supply.
So being a careful guy he switched all the MCBs and a RCBO in the Ashley CU to off
Switched the incomer to the CU to off
As a precaution he fitted some 5A fuse wire to the cut-out fuse carrier and wearing the necessary PPE put the fuse carrier back in.
All seemed fine
Switched the CU main switch to on and BANG, big BANG as the fuse blew
After a careful inspection he decided to try again, with the same result.
But this time inspection showed some evidence of blackening on the CU in the vicinity of a 32A RCBO (an old type as it took up 2 spaces on the CU)
Against the rules, but that's what we do guv, he disconnected and removed the RCBO and was then able to restore all other supplies. As he left the customer was arranging to have the CU replaced.
So watch out for some older RCBOs