I just dug out the box of bumf the previous owner left me which has cleared up why the alarm is connected where it is. The installation manual for the alarm says...
The best place to get power to the alarm control panel is directly from the consumer unit. The burglar alarm should have its own individual circuit protected by a 6a miniature circuit breaker. The cable from the 6a mcb should be 1.5mm twin & earth sheathed cable, which runs into an unswitched fused 3a spur connection unit
I've also found the alarm installation worksheet in which the engineer has written "no spare 6A on right side so adding to light circuit"
I am assuming from that that the alarm needs to be on the non RCD side so that if the RCD trips, the alarm is still powered.
As it states explicitly in the manual it should be protected by a 6a breaker, am I still ok following plugwash's advice and connecting it to the 20A heating circuit instead? It is correctly behind an unswitched 3a FCU as stated in the manual.
The best place to get power to the alarm control panel is directly from the consumer unit. The burglar alarm should have its own individual circuit protected by a 6a miniature circuit breaker. The cable from the 6a mcb should be 1.5mm twin & earth sheathed cable, which runs into an unswitched fused 3a spur connection unit
I've also found the alarm installation worksheet in which the engineer has written "no spare 6A on right side so adding to light circuit"
I am assuming from that that the alarm needs to be on the non RCD side so that if the RCD trips, the alarm is still powered.
As it states explicitly in the manual it should be protected by a 6a breaker, am I still ok following plugwash's advice and connecting it to the 20A heating circuit instead? It is correctly behind an unswitched 3a FCU as stated in the manual.
