Fused connection unit mounted on metal backbox

[Gary Tollison]

Ashley J803 Maintenance Free Junction Box 32A 3 Terminal - https://www.tlc-direct.co.uk/Products/ASJ803.html

Probably going to go with one of these for underfloor.
Even though access is easy, according to the regs, it “isn’t”.
So better safe than sorry!
Thank you all for the replies!
Opened my eyes a bit I must say

 

[Gary Tollison]

Heidi hi
Ok, so I’ve bought the maintenance free junction box (rather nice bit of kit too).
I’ve had a look at BS7671 app 15 regarding rings and radials.
After inspection and identifying the cables underfloor, I have this scenario:

An existing spur has been taken from a double socket outlet on the RFC.
The spur feeds a single socket downstairs in the lounge, which only ever has a 40 lamp plugged in, and the occasional phone charger.

In regard to RFCs and spurs, as far as I can tell, would it be acceptable to remove the existing spur from the socket outlet, and replace it with a cable feeding in to a switched fused connection unit, and from the FCU feed into the maintenance free junction box.
From the junction box would be both the feed to the shed (which would only have a light, occasional vacuum cleaner and power drill used), and the cable feeding down to the socket in the lounge?

Taking diversity into account, the demand from both would be low, even at the best of times.

Thanks in advance
Gary

 

[telectrix]

i would reconsider the shed feed. future use may require more power than you enviage at the moment. best way is a SWA from CU on it's own breaker/RCBO.

 

[Toneyz]

I try to avoid junction boxes in these situations as much as possible.
Does this RFC supply upstairs and downstairs, if so I would try to take from a socket directly.