Multiple FCU on radial?

[Electrician1972]

I have a 2.5mm supply in a loft and from this i have it going to a FCU which I then have my lighting mains for a switch coming from the load side of FCU , I then go from the FCU to 4 different sockets and then last in line I have to connect to another FCU for the bathroom heater downstairs , is this acceptable? (This would be a radial circuit as only one leg up from board for supply )

 

[Rockingit]

So long as it’s CPD is 20A and you meet disconnection times that sounds fine.

 

[Electrician1972]

So long as it’s CPD is 20A and you meet disconnection times that sounds fine.

 

[Electrician1972]

Sorry are you meaning my Circuit breaker should be rated to 20A as I was planning on using existing 32A breaker but can change to 20A if necessary

 

[Rockingit]

Pg 188 of the OSG refers - max CPD on a 2.5mm radial is 20A due to the cable only being rated to 27A.

 

[Electrician1972]

Pg 188 of the OSG refers - max CPD on a 2.5mm radial is 20A due to the cable only being rated to 27A.

Thanks a lot mate cheers

 

[Rockingit]

Pg 188 of the OSG refers - max CPD on a 2.5mm radial is 20A due to the cable only being rated to 27A.

NB - you said 'loft' in your OP which implies insulation, so check your derate factors as well!! It's 27A at method C, not buried throughout in itchy-scratchy stuff.

 

[Rockingit]

Thanks a lot mate cheers

Welcome, what we're all here for.

 

[Electrician1972]

Yes there is plenty insulation up the loft as is with most lofts but my cables are clipped to the top of the joists as floor in new loft is being raised so think I should be okay as cable not directly buried in any insulation.