Hi,
I'm sorry if this repeats a topic that I have been reading about shower installation, but my situation is a little different...
I'm thinking of getting a shower (have not made any purchases yet but I'm thinking 0f a 7.5-8.5 kW unit).
I'm a little concerned about load on the fuse boards that are fitted in my house. I have two crabtree boards.
The top one has in it the master trip (rated 100A). To the right of this is a 63A RCCB 100mA trip with three more trips (32A for the ringmain, 6A for a bathroom wall mounted heater (unused) and 20A for the ringmain to my conservatory). Unless I'm way wide of the mark, this box has a potential load of 52A at any given time (as the 6A trip is never used).
The bottom fuse board has a 63A RCCB with another 3 trips (32A for the cooker, 16A for the immersion heater and 6A for the lighting circuit). Again unless I'm way off, this box has a potential load of 54A at any given time.
My concern is that even though I have spare slots for more trips in either board, placing an extra load of 30-50A (depending on the wattage of the new shower unit) will cause either the main (100A) switch or the relevant 63A RCCB to trip as soon as I try to use it. I understand that the load on each board is likely to be a lot less than the fuse rating at any given time but it still seems a bit on the close side to me.
I'm wondering whether I need another box? Can anyone advise me at all?
I'm sorry if this repeats a topic that I have been reading about shower installation, but my situation is a little different...
I'm thinking of getting a shower (have not made any purchases yet but I'm thinking 0f a 7.5-8.5 kW unit).
I'm a little concerned about load on the fuse boards that are fitted in my house. I have two crabtree boards.
The top one has in it the master trip (rated 100A). To the right of this is a 63A RCCB 100mA trip with three more trips (32A for the ringmain, 6A for a bathroom wall mounted heater (unused) and 20A for the ringmain to my conservatory). Unless I'm way wide of the mark, this box has a potential load of 52A at any given time (as the 6A trip is never used).
The bottom fuse board has a 63A RCCB with another 3 trips (32A for the cooker, 16A for the immersion heater and 6A for the lighting circuit). Again unless I'm way off, this box has a potential load of 54A at any given time.
My concern is that even though I have spare slots for more trips in either board, placing an extra load of 30-50A (depending on the wattage of the new shower unit) will cause either the main (100A) switch or the relevant 63A RCCB to trip as soon as I try to use it. I understand that the load on each board is likely to be a lot less than the fuse rating at any given time but it still seems a bit on the close side to me.
I'm wondering whether I need another box? Can anyone advise me at all?