Emergency lighting pyro

[m4tty]

Hi,

I've been doing some maintenance for another spark in a big cash n carry. He tells me what to do and I do it. He's not there most of the time so let's me get on with it. I've explained that I know about domestic but never done anything else so if I think it's too hard or I'm unsure I get him to do it and he's fine with this.

I ran a new fp200 gold across the girder using girder clips to hold. I'm not sure how this circuit was wired and was told to replace the cable. Disconnect the pyro and reconnect the pf200g. I checked for voltage at the key switch which was fine and checked voltage at the control box for em lighting which was ok. I wasent asked to check the circuit out just replace the cable.

As voltage was present where it should have been I can't understand why the cable needed replacing. But one of the pots had come off the pyro by the control box. I know this wrecks the ir readings for the cable but would it cause the em lighting to fail. It wasent shorted out. No mcbs were tripping and no rcds here.

Any advice appreciated and if it doesn't make sense just ignore me.

Thanks

Matt

 

[Andy™]

may have how IR and going to fail?

 

[Manator]

The circuit could have been tested and found lacking on a previous PIR, interestingly there are some local tests that can be done on PYRO when any strange IR tests are carried out, we use to use matches some used blow torches to heat the area around any pot to see if the IR changed, this simple test could prevent the full replacement of a circuit.

 

[Andy™]

should always start from centre (or at least not at the end) and work towards the end. otherwise youll just push some moisture the other way

 

[kerching]

The circuit could have been tested and found lacking on a previous PIR, interestingly there are some local tests that can be done on PYRO when any strange IR tests are carried out, we use to use matches some used blow torches to heat the area around any pot to see if the IR changed, this simple test could prevent the full replacement of a circuit.

If you have not got a heat source then try a piece of string! Put one full turn around the bare cable sheath. keep both ends in seperate hands then perform a sort of 'see sawing' motion with string [sort of like the shoe polishing operatives do] if you see what I mean. the friction causes the sheath to heat up. Sounds odd but it DOES work... :coat

 

[Andy™]

of course, all the above may be a bad idea on a sheathed pyro...

 

[Sidewinder]

Maybe OK with a heat gun?...

CAREFULLY!

 

[kme]

I was taught kerching`s method - you`ve been scoobed. Really good way of determining IR faults in MICC

 

[Larnacaman]

Amazing!!! Replace a length of MICC cable, because of a problem with a pot!!!! No-one consider trying to drive out any moisture present with a heat gun, even a hair dryer, and remaking off the pot??

Obviously the pot hadn't been screwed onto the cable very well in the first place...