3P+E using 4P RCD

[dh5306]

Can anyone clarify

1) is it acceptable to use a 4P rcd for a 3P+E load (FLT battery charger located outside!!)

2) how to connect test button

thanks for help

 

[Riggy]

1) Yes, so long as you DON'T put the earth through the 4th pole.

2) Mmmmmm - can't think of how to do that without a neutral!

 

[Andy™]

1: yes

2: check wiring diagram. many 3 phase RCD test buttons are wired between 2 phases. failing that, work out resistance of test circuit to earth, and then add a resistor between another phase and 'neutral' which will match current flow for test button

 

[Evans Electric]

Test button should be built in , did a 4 pole the other day .

 

[Andy™]

Test button should be built in , did a 4 pole the other day .

yes, it will be built in, but may be wired between phase and neutral!