Fireangel mains smoke alarm wiring

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Sadruddin

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Hi.
Wiring in a series of Fireangel smoke alarms using 3 core plus earth.
The system wiring diagram says I connect L,N,I (grey wire to comminucate between different units), and Earth.
There is a three wired connector cable which connects into the unit itself.

By my logic, there's no issue with just connecting the provided 3 core (no earth) into the fire alarm circuit, with a connector for each of the three wires to mains, cable for alarm, mains on to the next unit.

The reason I am just a little unsure is that if I mount the alarm in a separate mount, (necessary in a few places because we have vaulted ceilings and i'm mounting them on a beam, and have no void above), I have to wire the mount in using both the from and two mains cables.

I hope this is clear.
 

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I think the earth/cpc needs to be ran to it just doesn’t have to be connected
 
Murdochcat said:
Not sure I agree with this.

230v systems need a continuous CPC. Most decent alarms have a cpc point to connect the earths
Click to expand...
Apologies. I was trying to mean it still needs to be there somehow, but if no connection point then it would need to be terminated into a connector block
 
Sadruddin said:
The reason I am just a little unsure is that if I mount the alarm in a separate mount, (necessary in a few places because we have vaulted ceilings and i'm mounting them on a beam, and have no void above), I have to wire the mount in using both the from and two mains cables.
Click to expand...
Are you tring to avoid more that one cable to the detector for aesthetics? You could star connect at a point where the number of cables is not seen? or arrange that those mounted on beams are at the end of a run
 
sparkymarka said:
Not sure what you are on about ? Just buy a deep base that comes with a connection for the 3 core and earth
Click to expand...
Hi. Yes, I have standard add-on bases, with 3 core and earth connectors, for the alarms mounted on beams on the vaulted roof.
With them, you terminate the 3+E cables into a block, screw the base on the beam, and the alarm clicks into place, with three pins.
(Which adds a lot to the bill, and Fireangel don't really point this out).

These aren't the issue.
With the standard alarm there's a flat ceiling mounted plate which the alarm clicks into, and a 3 pin plug which fits into the alarm.
(The three pin plug is embedded on the addon ceiling mounting I'm using on the beam).

On the add-on base, the 3 core + earth wire into the base, but the earth just joins into a null screw, basically, I suppose, to make sure the earth wires connect around the circuit.

SO my question is this.
If I'm not using the add-on socket, is it OK to just join the earth wires, and use star connects like Deryck says?
I think I may be overthinking this just a bit.....
 
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