Fluorescent lights and relays

[Ken77]

Hi all,

I've just been to test a number of faults and have found a number of classrooms have relays on fluorescent lights? Can anyone think of a logical reason why someone would have installed them like this?

Thanks in advance.

 

[Deleted member 72666]

So that they can be switched by timers and or photo cells perhaps.
How many lights to each cct, relay/contactor?

 

[Pete999]

What he said^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

 

[Ken77]

Depending upon the classroom there are between 4 - 8 twin 5ft tubes per relay.

I can see any evidence of a timer, (not to ay one does not exist).

 

[Deleted member 72666]

Depending upon the classroom there are between 4 - 8 twin 5ft tubes per relay.

I can see any evidence of a timer, (not to ay one does not exist).

Are there any occupancy sensors?

 

[Ken77]

None that I can see.

 

[Jonspark]

isn't there anyone available to ask how there controlled?

 

[Ken77]

Currently controlled via a 1 gang switch - which is why I can't see the point of the relay.

 

[davesparks]

Are they all on the same circuit ?

 

[Jonspark]

its normally like that if the design current is too high for the switch, so this way the switch only carries the load of the relay