Key switch for emergency lights

[bhamoggy]

Hi, I’m a bit new to this and I understand how to wire thru a grid key switch for emergency lighting but could someone please explain or show a small drawing how to wire with a key switch so when the key switch is toggled, the lights stay in and only turns off the emergency lights please

 

[MJPD29]

Just break the permanent or emergency feed through the key switch. The switch feed to the rest of the lights should be totally separate.

 

[cliffed]

Just break the permanent or emergency feed through the key switch. The switch feed to the rest of the lights should be totally separate.

Anyone ever seen this done properly.. emg lights only controlled by key switch & not looped of in circuit with other ordinary lights

 

[Mikegh]

The way I seen them done is CTU and multipole n/c contactor in the DB

Each lighting MCB you take a feed through a pole for emergencies

Ctu breaks the poles

 

[Petej999]

Anyone ever seen this done properly.. emg lights only controlled by key switch & not looped of in circuit with other ordinary lights

depends if the EM lights are Maintained or Non Maintained key switch is used for testing purposes..

 

[pirate]

Interesting...
I am no expert on this, but in a recent installation of maintained units, a separate permanent live was installed, without key-switches. Thus, when doing monthly testing we just trip the breaker for the lights and check that the ones with emergency modules stay lit...which they do. We don't check for them staying on for 3 hours, but an hour is fine, as the building is small and can be evacuated in under 2 minutes via 3 exits. Probably not "best practice" but for a small building it works fine.

 

[Mikegh]

Interesting...
I am no expert on this, but in a recent installation of maintained units, a separate permanent live was installed, without key-switches. Thus, when doing monthly testing we just trip the breaker for the lights and check that the ones with emergency modules stay lit...which they do. We don't check for them staying on for 3 hours, but an hour is fine, as the building is small and can be evacuated in under 2 minutes via 3 exits. Probably not "best practice" but for a small building it works fine.

I don't get that?

 

[pirate]

Not sure what you don't get, but I will try to explain if you can elucidate. Thanks.

 

[bhamoggy]

So this is how I drew it up.

 

[Mikegh]

Not sure what you don't get, but I will try to explain if you can elucidate. Thanks.

You mean 2 feeds from the MCB

One for maintained permanent L,
one for general+ maintained s/l