New install for social alarm system PSU

Question

Hi 
 I'm going to let the photo speak for it's self. The RCBO is powering a PSU with battery back up, which is powering a social housing alarm system. All the equipment is mounted in a steel cabinet on the outside wall of a bungalow. The supply is a TNCS. 
 All comments will be gratefully received. 
 
 Thanks

AJJewsbury · Accepted Answer

but what really is going to cause it to trip? 
 
 The SPD downstream of the 30mA incomer could well mean nuisance tripping - as surges will be diverted to PE - but otherwise I agree the PSU shouldn't leak anything like enough to trouble an RCD in normal service (unless it's got another SPD of course). 
 - Andy.

New install for social alarm system PSU

Join us to get the best from IET EngX.

Community Rules & Guidelines