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Is there anyway of detecting the phase of a circuit from a 3phase board at a socket or switch???

I was told to just do each floor on one zone. So if that zone is activated they knew which floor to respond to, You can have more than one panic alarm on one circuit, cant you. They've changed their minds anyway now, each till will have its own zone.

thanks for your comments. I spoke to my boss, and he's alittle wary of the come back on us (with invalidating the insurance/false alarm etc) so I'm now going to install a stand alone system to all but the main till, with an alarm simply in the security office. I think theres 10 till areas, and 4...

I am able to disable the alarm via security there, so I wouldn't be altering it while the alarms active.

Top Site....the guy I work with isn't the most helpful and expects me to know everything, good to get some input from other electricians. One problem I'm abit unsure of is wiring up panic alarms for a number of checkouts/tills. In this retail place there are around 10 tills but only one panic...

its a TN-CS system. Went and got one of those heavy duty earth clamps. Boss said 'grand job lad', So it must be right. Thanks

In an empty wharehouse where we're just starting work, theres a large supply coming in with its main earth using a 35mm earth cable. I'm going to use 25mm earth for bonding to the gas and water main, however the gas pipe is 3 inches across. And i havent done bonding with that size of earth and...

cheers, will do. And thanks for the speling tip

Hi, My boss has told me to wire a flood light about 10m away from a building along a steel gurder, which I have no problem with. However he says just wire it in normal 1.5 t/e and tie wrap it to the gurder. Is 1.5 t/e ok to use outside? as I would have thought it would not be suitable. What...