A supply to an alarm system or control system is definitely a power circuit. The function of the circuit is definitely not not "signalling and control".

ebee:

Graham,

"special Preparation" of say 1.0 mm2 or whatever , would you be inclined to put a cable doubled doubled doubled ......... etc into that category? In an ideal world (which does not actually exist) such doubling (or twisting if you must) will take the conductor effective diameter up towards the terminal hole diameter thus making decent electrical contact and possibly mechanical soundness too.

Doubling back may be OK as "preparation" for screw terminals, if you can effectively fasten down on both sides - more than a simple doubling back (double-double) I'm thinking might well fall into the "too hard" or "bit of a bodge" category.


But of course, screwless terminals and crimp connectors are another thing altogether and you should follow manufacturer's instructions for those.

OlympusMons:

An oven and cooker hood usually have a luminaire, which can be used solely for the purpose of providing light. The oven can also cook, the hood also extracts. When used for lighting purposes, the circuits can have min CSA 0.5mm2. They would also need RCD protection.

Apologies to OP for a bit of thread drift. 

If you were being pedantic, you'd ask whether the appliance were made to a product standard for luminaires, or a product standard for an extractor: it's likely to be the latter ...


Where do we stand with lighting fed from an FCU on a socket-outlet circuit? Is that a "new circuit" (potentially, it has a common protective device being the fuse ...)?

AJJewsbury:

A supply to an alarm system or control system is definitely a power circuit. The function of the circuit is definitely not not "signalling and control".

My original example was for a smoke alarm circuit (no separate FCU) - the argument being that the function of the entire circuit was to provide a danger warning (signal) to occupants. Any signalling or control circuit must draw some power in order to operate. I agree a supply to a FCU to something which in turn might supply a signaling circuit is less clear.


On the other side of the coin, where would a power-over-ethernet (PoE) cable fit in this scheme? (especially one where only the power was used at the far end - say for a separate CCTV illuminator - so the data path was unused).


  - Andy.

The circuit that provides power for the smoke alarms or alarm panel must be a power circuit, as it provides power to that equipment.


Otherwise, your proposed interpretation means that a power circuit that feeds an IT rack in a data centre is ITC cabling ...

The circuit that provides power for the smoke alarms or alarm panel must be a power circuit, as it provides power to that equipment.