Been asked to do a PIR on a school that i've previously done a bit of installation work for. Most of it is fairly straightforward but i have a few concerns regarding sensitive equipment etc..
They have fire detection alarm, intruder alarm, separate alarm for ICT suite and a smoke cloak device.
Anyone know anything about these with regard to how they deal with power going off etc?
I'd probably only test up to the spur that feeds them or maybe even exclude the circuits providing these completely within the limitations but the power will have to go off for all circuits at some point.
Also, i popped in there the other day, i had a couple of hours spare so i thought i'd test a couple of circuits, see what the results were like and give me an idea of how long it would take, how easy access was etc..
Tested a lighting circuit supplying 2 rooms. R1R2 tested fine, pulled the neutral from the block, IR tested L to N (with switches off in the rooms so the fluorescents didn't interfere) tested fine but L to E and N to E both wouldn't test as the meter showed 47v present on the circuit.
Am I overlooking something really basic here?? Any ideas??
Any help much appreciated........
They have fire detection alarm, intruder alarm, separate alarm for ICT suite and a smoke cloak device.
Anyone know anything about these with regard to how they deal with power going off etc?
I'd probably only test up to the spur that feeds them or maybe even exclude the circuits providing these completely within the limitations but the power will have to go off for all circuits at some point.
Also, i popped in there the other day, i had a couple of hours spare so i thought i'd test a couple of circuits, see what the results were like and give me an idea of how long it would take, how easy access was etc..
Tested a lighting circuit supplying 2 rooms. R1R2 tested fine, pulled the neutral from the block, IR tested L to N (with switches off in the rooms so the fluorescents didn't interfere) tested fine but L to E and N to E both wouldn't test as the meter showed 47v present on the circuit.
Am I overlooking something really basic here?? Any ideas??
Any help much appreciated........