Recommended checks before CU change

Hi Fitzy71 , remove the fuseboard cover and make an assessment of the wiring .


Make sure you have enough neutral and earths to match the line cables.


Take a sample of accessories off and check wiring looks ok especially obvious additions.


Run a wander lead from earth bar around all metal accessories and earth contacts at sockets etc.


Do ring circuit continuity at a convenient socket.


If all looks good then carry out an insulation resistance test between line/neutral to earth at fuseboard with as much stuff disconnected as possible.


Chances are you will get low IR , spend abit of time trying to locate reason why ie disconnect neutrals at board.


If IR is so low that it will cause Rcds to trip then either up yor quote or let Dave down the pub change the board.


If all reasonable then I also find that a ma clamp meter now comes in handy.


Clamp the tails and turn everything on , again if high ma reading then you can probably find out which appliance is causing it.


Make sure you turn on the heating/immersions and timers ,  if pir lighting then if possible tweak it so that you can do a walk test.


If all ok then change board.


One point , make  sure the incoming gas and water are not over the other side of the property.


You dont want to go running new bonding cables around a newly decorated kitchen.


You can probably do all this for your £90 pre inspection.


Obviously check Ze.


Regards

Hi Fitzy71 , remove the fuseboard cover and make an assessment of the wiring .


Make sure you have enough neutral and earths to match the line cables.


Take a sample of accessories off and check wiring looks ok especially obvious additions.


Run a wander lead from earth bar around all metal accessories and earth contacts at sockets etc.


Do ring circuit continuity at a convenient socket.


If all looks good then carry out an insulation resistance test between line/neutral to earth at fuseboard with as much stuff disconnected as possible.


Chances are you will get low IR , spend abit of time trying to locate reason why ie disconnect neutrals at board.


If IR is so low that it will cause Rcds to trip then either up yor quote or let Dave down the pub change the board.


If all reasonable then I also find that a ma clamp meter now comes in handy.


Clamp the tails and turn everything on , again if high ma reading then you can probably find out which appliance is causing it.


Make sure you turn on the heating/immersions and timers ,  if pir lighting then if possible tweak it so that you can do a walk test.


If all ok then change board.


One point , make  sure the incoming gas and water are not over the other side of the property.


You dont want to go running new bonding cables around a newly decorated kitchen.


You can probably do all this for your £90 pre inspection.


Obviously check Ze.


Regards