Hi guys, have some questions due to disagreement with my electrician:

1) I asked to put 10mA 63A RCD for water heater + electric water closet + 2 power socket but he said it's better to do 1-to-1, meaning 1 RCD for 1 water heater instead, which does not make sense to me. Is 10mA too sensitive to be practical for what i am planning to use for? If not, i am planning to use only single 10mA RCD for 2 bathrooms lol.

2) He asked me to only use 1 RCD for all the lighting, fans and power sockets for the whole second floor, which i disagree with because it would mean total blackout when it trips.

3) I have asked for 30mA RCD for the lighting, fans and power sockets but he said to use 100mA RCD, which i again disagree with as anything over 30mA would be meaningless as it would greatly increase the fatality rate.

Having said that, i am concerned with nuisance tripping so would like to ask if there is anyone who changed 30mA for the house and 10mA for the water heater and experienced constant nuisance tripping?

4) Is it wise to use 30mA RCD for aircon? Or should i use 100mA or higher? Heard inverter aircon often causes nuisance tripping. But seems like no point when we go over 30mA.

Thanks!

Dear sifus, is it weird that both Hager and Schneider do not have RCCB type A for 10mA or even 10mA RCBO with 20A or 25A rating?

Reason being is that some water heaters come with pump (mine does), so naturally the RCCB has to be type A (protects against pulsating DC current) instead of type AC isn't it?

And then there's the issue of RCBO being 16A, which barely exceeds the max wattage of some water heater. I know water heater does not usually run at full load but i am not willing to buy one to test if it will trip and end up not being able to use it.

Maxguard does produce type A for 10mA RCCB and 10mA 20A for RCBO but mixing with Hager MCB is a no no for me. Plus Hager has better build with better anti-nuisance features.

Also what SPD do you guys recommend? Type 2 that is installed after the main switch? Mine is a single phase DB. For Hager, there is this medium protection, fine protection, with reserve, without reserve and monobloc series, don't even know how to decide lol.

Installing SPD to reduce nuisance tripping during lightning as i will be using majority 30mA for sockets/lighting.

Lastly, is isolator needed and how does one arrange the DB sequence? And should RCCB be installed first before MCB or vice versa? Sockets>RCCB>MCB?

Thanks in advance.

This post has been edited by Cyberbullies: Jul 9 2018, 01:02 AM