Socket outlets supplied via an emergency trip button

[stever37]

I was wondering if any one has installed anything like what I have been asked to do.

It is in a training enviroment and they would like approx 5 sockets installed allong a wall that can have the power switched off via an emergency trip button by the teacher if required.

I was thinking a radial circuit fed via a contactor which opens when the emergency trip sw is hit. Not that experienced with contactors to be honest. If the contactor is N/O therfore requires a supply to keep it closed (which will be the normal state) will this not eventually burn out the energising coil ? Or does a contactor `latch in`. Was thinking of the control circuit via the emergency trip sw with N/C contacts hence when operated de-energises the operating coil of the contactor thus de-energising the radial circuit. (But concerned about burning out the operating coil)

I am on the right track here ?

 

[telectrix]

not permanently. i would advise the "instructed/skilled person" in charge that the installation should be turned off when not in use.

 

[netblindpaul]

Quite Tel,
The install should be shut down when not in use!
Believe it or not this is a requirements of the CoP IIRC.

However, it is not uncommon in certain industries for contactors to stay energised for years on end 24/7/365.

 

[High Tower]

I stand corrected!, thought that only applied to machines, diddnt realise it applied to sockets etc. thanks for the info!

 

[tigerpaul]

I had to do a job once where they wanted an emergency button which when operated, energised a normally closed relay, which then opened, thus breaking the power to all the various bits of equipment.

Ther were a few red faces when i pointed out that should the mcb controlling the emergency stop circuit trip (yes it was a different one) , and nobody noticed... then the emergency stop button will become useless.

Hard to believe people paid far more money than I, can come up with this crap.