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Press switches that operate a staircase timer, How do these work. Is it a simple case of the switch closing the circuit which sends a live to the timer. so that brief closing energises the timer. Any wiring diagrams you may have handy would be appreciated Thanks

Door entry system Function of each terminal 5 − 21 12 V DC supply voltage + 8 common call (for witness note) 11 audio to receiver 12 audio from receiver 14 enabling What is enabling? In the photo we have 4 bell pushes Would this be wired as the...

A current using piece of equipment only take the power it needs from the supply voltage. ( assuming not fault) So for example you had a light bulb. 100W It was feed from one 230 v supply it would take all the power it needed from that supply to work correctly So 100/230 = 0.4 A Now...

How would this work (Would it) Idea is for Humidistat (Manrose 1360) to control fan during the day Would like the fan to also come on when light is on Would you connect light switch to fan as usual and also connect Humidistat to fan as usual This would mean though that the fan...

Struggling to understand the safety aspect. I understand that the transformer separates the supply voltage from the secondary and removes the earth (tied to neutral?) But can I be a new earth for the current to want to flow too? What would happen if I dropped my shaver in a sink full...

A Combi Boiler wired to a honeywell room stat for heating Boiler is a Vallient. Can the heating still function if I remove the stat. Can the stat be over ridden by the boiler? or does it need the switch live from the stat thanks

Sizing Earthing conductor This is the cable from the supply cable (SWA) to the MET ( an earth block) Clamp is a Bs 951 earth clamp - not acceptable on lead, is that still the case on SWA? Cable looks to be 4mm2 but could be 6mm2 Now I understand that this is nothing to do with...

What tests a ELV transformer can you do to check it works. This is when it is not connected to a supply, out the box as it were.

what could be the possible reasons why a transformer blows. changed a ELV down light transformer (one per fitting) when switched it on it worked for 2 seconds then the transformer popped. wired correctly mains to primary, lamp to secondary. out of 5 lights only one works all the...

Hi Trying to understand heating systems, but am at the real basics stage (at college but the course does not do heating I believe) Combi boilers heat water on demand so when the hot tap is turned on the boiler fires up straight way, no need for controls? Do some combi boilers have...