Advice on Installation

[GBDamo]

I would say the fuse is largely irrelevant as it is not needed to provide protection, the fuse in the DB is doing that.

All yo really want is an RCD.

Slap a 13A in it.

If such a beast existed, you could fit a non fused RCD spur.

Tin hat on.

 

[Deleted member 26818]

You need to get your discrimination tables out to answer that one!
My gut feel is that it won't discriminate.

But, whoa fella. Why an RCD FCU?. Just install an FCU.
You do not need any additional fusing.

Circuits supplying luminaires now require 30mA RCD protection.

 

[Taylortwocities]

Sorry. I meant to say you just need an RCD. I’ve edited my post.

 

[Thomas Connolly]

I just thought it would be cheaper and simpler to just add an RCD FCU would it now?

Just means I can split the existing cable, add the RCD FCU in between and be done with it?

 

[Deleted member 26818]

I just thought it would be cheaper and simpler to just add an RCD FCU would it now?

Just means I can split the existing cable, add the RCD FCU in between and be done with it?

One of the problems with that idea, is the requirement is to provide RCD protection for the circuit, not just part of the circuit.

 

[GBDamo]

The simplest and most stress free way to do this would be to put the RCD FCU at the point you connect to the old circuit.

This would require a sensible, accessible location.

 

[GBDamo]

One of the problems with that idea, is the requirement is to provide RCD protection for the circuit, not just part of the circuit.

I think his intention was to do this at the DB.

Why would the whole circuit need RCD protection?

Surly it would only be a requirement for the addition, or have i misunderstood the requirement again?

 

[45140]

This might be what you need
https://www.NoLinkingToThis/p/british-general-5-module-3-way-populated-garage-consumer-unit/1926g

 

[Deleted member 26818]

I think his intention was to do this at the DB.

Why would the whole circuit need RCD protection?

Surly it would only be a requirement for the addition, or have i misunderstood the requirement again?

It’s in the wording of the Regulation, same as for locations containing baths or showers.
The requirement is for the circuit to be provided RCD protection.
This is not the same as protecting cables concealed in walls or protecting items plugged into socket-outlets.

 

[Thomas Connolly]

I figured I could put the RCD FCU next to the DB?

So the existing cable that comes from the fuse to the lighting circuit, essentially, split that in two, connect the side from the fuse to the supply side of the RCD FCU and then the cable that then runs to the lights on the load side of the RCD FCU....

That way the whole circuit is protected and the new fused unit stays out of sight but would still be accessible and I don't have to tamper with the fuse board too much (aside from safe isolation and testing etc)

Again, please feel free to correct me if I'm wrong?