J
Jimmyb
Hello, just after people thoughts, I have been asked to replace a consumer unit (original is plastic) and the cable feeding the house is supplied from a switched fuse 60meters away with no rcd protection, the first 18meters is 16mm twin and earth and the rest is 16mm 4 core with the 2 cores doubled up and the steel used as cpc. (the house has barely any load as has oil boiler, arger cooker and no showers ect)
They had someone else a few years ago pick up on the fact that the earth is undersized so he installed a rod and made the house TT. all good and well at the time.
Now I want to/have to install a metal board and was wondering which is the correct way to go about it
1. Gland the swa into a separate enclosure before the consumer unit and run the core of the swa though conduit and into the cu. (zs too high for switched fuse so a no go)
2. Gland swa straight into consumer unit (cant do due to undersized cpc so again a no go)
3. Add 100ma T/D RCD enclosure before consumer unit then conduit into consumer
I don't really like the sounds of option 3 due to the cost of a T/D rcd but I cant think of another way
Many thanks
Jimmy
They had someone else a few years ago pick up on the fact that the earth is undersized so he installed a rod and made the house TT. all good and well at the time.
Now I want to/have to install a metal board and was wondering which is the correct way to go about it
1. Gland the swa into a separate enclosure before the consumer unit and run the core of the swa though conduit and into the cu. (zs too high for switched fuse so a no go)
2. Gland swa straight into consumer unit (cant do due to undersized cpc so again a no go)
3. Add 100ma T/D RCD enclosure before consumer unit then conduit into consumer
I don't really like the sounds of option 3 due to the cost of a T/D rcd but I cant think of another way
Many thanks
Jimmy