V
voltage
Hey all
New to the forum just saying hello to everyone.
I have a question i need to change a MCB on a consumer unit its quite old i think the make is square D so probs getting on for 15 plus yrs old ? not sure anyway ive managed to source a new 40 amp mcb breaker for the CU which is the same make square D lucky as i think these Square D MCBs are as rare as rocking horse s**t .
Now my question is as this installation is pretty old there is no main isolater in the line from the electricity company only the old fuse which i know you cant break and would not want to as its bad practice.
I had a shower fitted and the cable is 10mill the MCB is 30 amp at CU. The rating of the new shower is 8.5 kw so doing the math that is 8500 / 240 which gives me 35.41 amps so this would tell me i need a 40amp MCB.
Now if i just turn off main switch on CU obviously im still gonna have power coming form the meter tails so what is the best way of safely isolating the CU so i can take out the old 30amp MCB and replace it with the new 40amp MCB ?
Any advice would be greatly appreciated thanks
New to the forum just saying hello to everyone.
I have a question i need to change a MCB on a consumer unit its quite old i think the make is square D so probs getting on for 15 plus yrs old ? not sure anyway ive managed to source a new 40 amp mcb breaker for the CU which is the same make square D lucky as i think these Square D MCBs are as rare as rocking horse s**t .
Now my question is as this installation is pretty old there is no main isolater in the line from the electricity company only the old fuse which i know you cant break and would not want to as its bad practice.
I had a shower fitted and the cable is 10mill the MCB is 30 amp at CU. The rating of the new shower is 8.5 kw so doing the math that is 8500 / 240 which gives me 35.41 amps so this would tell me i need a 40amp MCB.
Now if i just turn off main switch on CU obviously im still gonna have power coming form the meter tails so what is the best way of safely isolating the CU so i can take out the old 30amp MCB and replace it with the new 40amp MCB ?
Any advice would be greatly appreciated thanks