3 Pole ELCB
3 Pole ELCB
(OP)
I want to use an ELCB in a thre phase three wire system.
As only two or four pole ELCB's are available here, can I use a 4P ELCB with any one pole unwired? Will it trip in case of earth fault?
As only two or four pole ELCB's are available here, can I use a 4P ELCB with any one pole unwired? Will it trip in case of earth fault?





RE: 3 Pole ELCB
As long as the current through the sense coil is balanced, it won't trip. If the leakage current does not return through the sense coil (and exceeds trip limit), it trips. RCDs with three phases and N (four pole) are used in TN-S installations, but should be possible to use in TN-C systems (mustn't return PE through RCD, though). Where in the World are you? What does local code say?
Gunnar Englund
www.gke.org
RE: 3 Pole ELCB