SirSpark wrote:
Could you not put remote test blocks, granted now you are relying on the wiring to and form the test block to not have any breaks, though this would also add aditional expense.
If you read the rest of the postings on this thread, you will find discussion on this.
IMO - still - the best solution is permamently installed LED indicators in each phase. The voltage presence is visualy verified before the disconnect is open. It's absence is indicated by the LED turning off when the disconnect is operated. In case of fuses it also indicates blown fuses and a good indicator of welded contacts or missing contact closure.
One important thing to remember, whenever a fault is suspected, one should double verify it's validity to eliminate the failure of the detection, eg. failed indicator.