hello all
unusual fault that is perplexing me.
History
garage is fed via a spur off the ring main downstairs and during heavy load, the fuse would blow.
to get around it I would turn off things on that ring main and all was fine.
later, I had fuse board replaced with circuit brekaer trips and rcd.
now the whole board trips out when I use a 2.2kw grinder on it.
to get around the issue, a line from a spare circuit breaker in the board was wired from fuse board directly to garage just like an electric cooker cable individual line. 16A rated.
but problem still persists.
Grinder can be used on the cooker socket and cause no concern so grinder is OK
3kw kettle can be used on old ring main to garage, new line to garage and any ring main in the house without issue so induction motor initial draw is causing concerns.
now the complicated bit and I shall do my best to accurately describe.
live to the board is fed via main isolation load trip switch which first enters another mains isolation before making one side of the buz bar live in the board.
this side of the board feeds a socket ring main breaker 32A rated and two lighting circuit breakers 6A rated.
the second side of the buz bar is made live after first passing through an RCD before making a cooker 32A breaker live, a socket ring main 32A and a 16A spur to garage live.
whent he grinder is used on the socket ring main of the 1st live section of the buzbar, the rcd trips out but the grinder operates fine which is confusing. when the grinder is used on the old garage socket or the new spare to the garage, the main isolation to the board trips out.
I have in mind that the rcd should maybe be replaced just to see if it is on the sensitive side but I'm a little lost why the rcd tripping out and not the breaker to the circuit it is connected. so an inbalance is causiing some fault.
the lad I use for the elecrtrics is on holiday so I would like to do a little problem solving of my own to inform of fault when he returns. also if its a simple fix then I may just fix it myself so I can do a bit of work in the garage.
this is a long winded post so many thanks to those who take the time to read and reply.
best regards
unusual fault that is perplexing me.
History
garage is fed via a spur off the ring main downstairs and during heavy load, the fuse would blow.
to get around it I would turn off things on that ring main and all was fine.
later, I had fuse board replaced with circuit brekaer trips and rcd.
now the whole board trips out when I use a 2.2kw grinder on it.
to get around the issue, a line from a spare circuit breaker in the board was wired from fuse board directly to garage just like an electric cooker cable individual line. 16A rated.
but problem still persists.
Grinder can be used on the cooker socket and cause no concern so grinder is OK
3kw kettle can be used on old ring main to garage, new line to garage and any ring main in the house without issue so induction motor initial draw is causing concerns.
now the complicated bit and I shall do my best to accurately describe.
live to the board is fed via main isolation load trip switch which first enters another mains isolation before making one side of the buz bar live in the board.
this side of the board feeds a socket ring main breaker 32A rated and two lighting circuit breakers 6A rated.
the second side of the buz bar is made live after first passing through an RCD before making a cooker 32A breaker live, a socket ring main 32A and a 16A spur to garage live.
whent he grinder is used on the socket ring main of the 1st live section of the buzbar, the rcd trips out but the grinder operates fine which is confusing. when the grinder is used on the old garage socket or the new spare to the garage, the main isolation to the board trips out.
I have in mind that the rcd should maybe be replaced just to see if it is on the sensitive side but I'm a little lost why the rcd tripping out and not the breaker to the circuit it is connected. so an inbalance is causiing some fault.
the lad I use for the elecrtrics is on holiday so I would like to do a little problem solving of my own to inform of fault when he returns. also if its a simple fix then I may just fix it myself so I can do a bit of work in the garage.
this is a long winded post so many thanks to those who take the time to read and reply.
best regards