Add light to fused spur

[Taylortwocities]

So, ignoring the usual (Winston instigated) bickering, the answer to your question is: yes you could.

If the feed is from a 6A protected circuit, you could make the connection to the light from the FEED side of the FCU, leaving the switch and fuse to control/protect the alarm panel.

 

[winston1]

There is already one there, you best ask why the alarm installer put one there? I was using FCU as terminal for live feed on supply side.
So the OP could either use what already exists or spur of the breaker at the board. On this instance I did not suggest installing a FCU, just utilising it

The discussion regarding the use of FCUs on low amp circuits has already been discussed, in previous topics.

But they is no regulation preventing the use of them.

We have not yet established the size of the MCB in the CU. But IF it is a 6 amp circuit under fault conditions the MCB would probably trip before a 3 amp fuse blew rendering the FCU redundant.

No doubt the alarm installer put it there because he did not understand the fundamentals.

 

[winston1]

Once you learn to read you will.

I can read, think, and realise that you don't know what country you are in, but I have never seen MI that say put a FCU on a 6 amp circuit.

 

[winston1]

One reason for having a FUSED connection unit is to provide an assured disconnection by removal of the fuse to assist in ensuring the safety of a person working on the equipment.

The MCB will do that. Just switch it off.

 

[winston1]

, leaving the switch and fuse to control/protect the alarm panel.

There is no switch. It is an unswitched FCU.The alarm panel will have its own internal protection.

 

[bernardgreen]

The MCB will do that. Just switch it off.

And while person A is working on the equipment person B sees the MCB is down and flicks it back ON.

 

[winston1]

And while person A is working on the equipment person B sees the MCB is down and flicks it back ON.

So this argument could be used to put an FCU on every light fitting!
Surely if that was likely person A would put a note on the MCB.

Person B could also replace a fuse in the FCU by the way.

 

[Taylortwocities]

If it comes directly from CU, I assume 6A breaker?

This needs verifying

 

[PrenticeBoyofDerry]

We have not yet established the size of the MCB in the CU. But IF it is a 6 amp circuit under fault conditions the MCB would probably trip before a 3 amp fuse blew rendering the FCU redundant.

No doubt the alarm installer put it there because he did not understand the fundamentals.

We have yet to establish the upstream protective device, so there could be a perfectly good reason for the FCU. You are probably correct, that under fault conditions that a 6A BS EN 60898, would trip before a 3A BS1362 .
But without further information, we do not know what the circuit is.
Apart from that, as I have already mentioned, the regulation do not exclude FCUs on a 6A circuit. With regards to the OP's situation, the FCU exists, there is no reason for it to be removed and it can be utilised for their project.

 

[PrenticeBoyofDerry]

yes, PrenticeBoyofDerry, I was looking if I could use whats there, take a wire off the FCU to the light

Do you know what device and rating that protects this circuit at the consumer unit/fuse board, I am not sure you have disclosed this information yet?

 

[securespark]

In which case they would be wrong. There is no need to follow MI especially if they are wrong. They can be taken account of. I have never MI which say put a FCU on a 6 amp circuit.

You know very well we could all drag up MI's from the net that show an FCU on a 6A circuit, but I'm not going to feed the troll.

 

[mr rob]

Without killing each to identify the feed to the FCU /alarm, this is the view I have of the CU..

 

[PrenticeBoyofDerry]

Without killing each to identify the feed to the FCU /alarm, this is the view I have of the CU..

Without doing some investigative work, the picture is not helpful.

 

[mr rob]

yeah i know... just need to find the right time to test.. and its a right mess/ hard to access area.

sorry (but still here)

 

[stillp]

Well, at least we know the circuit isn't on a 6A breaker!

That's some spider in the corner!