LED lighting problem

[flukey]

hi all
after a bit of advice really :wink5:
on a job today to connect up a sign full of leds.
feed had already been run to sign via photocell.
once connected all worked fine until photocell was reset and then activated again causing the mcb to trip
spoke to another spark who thought there was a problem with the photocell striking the transformers?? and advised putting on a timeclock.
tried this and same problem :furious3:

any ideas greatly appreciated as always

 

[J&M Electrical]

Strange 1. Could you try a standard 1G switch or something just to make sure its nothing to do with the LED drivers/transformers/cable running to the sign? Its odd that with a timeclock its tripping, as all a timeclock is really is a switch. Maybe a stupid question but the load isnt too big for the Photocell and timeclock is it? Will the sign lights work when the timeclock is over-ridden or on continuously?

 

[DurhamSparky]

strange this one!!

MCB 6A??? Type B???

 

[flukey]

Sign works fine on permanent feed plus loading is fine and yes 6 amp type B mcb??

 

[DurhamSparky]

how many lamps are fitted and what is the total usage??

all i can think of is that when they are been powered up the switch / photocell is causing a "phantom" surge of power as it latches.

try changing to Type C mcb...?