Hi all,
I understand about RCD discrimination, but should the same theory be applied to MCBs / Main switches, or is it just ‘convenience’ to have the mcb trip nearest to the circuit protected?)
I have sub main with a 25A 30mA RCD main switch, coming off a 16A MCB on the main board (protected by a 100mA RCD). I want to add a sub-sub main, but while RCD discrimination is okay - there is currently no discrimination on the MCBs. What rating should I go for to protect the sub-sub main.
Can't go above 16A as I'm into unacceptable voltage drop range.
thanks
Philip
I understand about RCD discrimination, but should the same theory be applied to MCBs / Main switches, or is it just ‘convenience’ to have the mcb trip nearest to the circuit protected?)
I have sub main with a 25A 30mA RCD main switch, coming off a 16A MCB on the main board (protected by a 100mA RCD). I want to add a sub-sub main, but while RCD discrimination is okay - there is currently no discrimination on the MCBs. What rating should I go for to protect the sub-sub main.
Can't go above 16A as I'm into unacceptable voltage drop range.
thanks
Philip