Unnecessary FCUs?

[Geflugenmitt]

Is there a need for a Fused Connection Unit (as opposed to unfused) for hard-wired appliances which have their own dedicated (and correctly protected) radial circuit?

I am doing my own house wiring (I have an electronics background), and a qualified electrician is giving guidance and testing/signing off the work. Some appliances like storage heaters, immersion heater etc have their own 16A MCB and a single 2.5mm cable run to a connection unit, at which point a 2.5mm heat resistant flex links this to the appliance. My electrician has advised some of these connections be fused, whilst others he's not bothered about. I don't understand why the distinction.

For example storage heaters - no fuse, immersion heater - fuse. In both cases you are connecting a certain gauge of cable with the same gauge of flex, and the MCB at the source is rated low enough to protect both.

What is the general guidance/regulations please?

 

[JohnW2]

Is there a need for a Fused Connection Unit (as opposed to unfused) for hard-wired appliances which have their own dedicated (and correctly protected) radial circuit?

No, provided that the cable downstream of the connection unit is sufficiently beefy to be adequately protected by the over-current protection of the circuit as a whole (which would be the case with the examples you quote).

Kind Regards, John

 

[EFLImpudence]

You do not need FCUs for storage heaters nor immersions on circuits which are correctly fused or

for appliances with plugs.