- Reaction score
- 25,531
Excuse my non harmonized pens but this is a simplistic drawing. So you have one line supply split at the two switches and it can be seen that just isolating SW2, the emergency lighting test facility you have not completely isolated the circuit as the general switch, SW1 is still in circuit. So to fully isolate it must be done prior to these two switches. You can see the emergency light has the additional charge supply at L2 which the general light doesn't have so the neutral still carries current to the general light if only the test facility, SW2 is off.
Last edited: