S
scarecrow
Hi,
I wonder if one of you knowledgable people would be kind enough to advise me on something which seems a little to minor to call out an electrician for.
I'll give as much information as I can.
I've recently bought a house, built in the early 1950's and at some point, it has been completely rewired. Whoever rewired it was thoughtful enough to put a tag round every single cable just before it enters the consumer unit (for example: "ground floor ring main 2.5mm" or "immersion radial 2.5mm").
The consumer unit has an RCD as the main on/off switch. The upstairs and downstairs ring mains are protected with 32amp mcb's each and the lighting upstairs and downstairs radials are protected by 6amp mcb's.
The cooker radial (10mm) has a 45amp mcb and the 2.5mm radial to the immersion is fitted with a 16amp mcb.
The circuit I am interested in is a radial which feeds a large shed (16ft x 9ft), is 4mm cable and protected by a 16amp mcb. It's total length (including rising up to the consumer unit) is approximately 14 metres where it is then joined to a 4mm armoured cable in a 6" or 7" 60amp junction box under the floor near the back door.
The armour sheathing is connected to an earth cable which runs from the consumer unit to an earth stake outside.
This 4mm armoured cable (which is also approximately 14 metres long) then runs to the shed where inside, it reverts back to 4mm pvc covered cable (again via a 60amp juntion box; the armour sheath is not connected to anything at this end) and from there goes into a consumer unit (no rcd).
From this consumer unit there are 2 radial circuits, one in 1.5mm for lights with a 6amp mcb and the other radial circuit is 2.5mm feeding several sockets and protected by a 16amp mcb.
My question is can I replace the 16amp mcb's in the main house consumer unit and the shed consumer unit with 20amp mcb's?
Thanks for any advice.
I wonder if one of you knowledgable people would be kind enough to advise me on something which seems a little to minor to call out an electrician for.
I'll give as much information as I can.
I've recently bought a house, built in the early 1950's and at some point, it has been completely rewired. Whoever rewired it was thoughtful enough to put a tag round every single cable just before it enters the consumer unit (for example: "ground floor ring main 2.5mm" or "immersion radial 2.5mm").
The consumer unit has an RCD as the main on/off switch. The upstairs and downstairs ring mains are protected with 32amp mcb's each and the lighting upstairs and downstairs radials are protected by 6amp mcb's.
The cooker radial (10mm) has a 45amp mcb and the 2.5mm radial to the immersion is fitted with a 16amp mcb.
The circuit I am interested in is a radial which feeds a large shed (16ft x 9ft), is 4mm cable and protected by a 16amp mcb. It's total length (including rising up to the consumer unit) is approximately 14 metres where it is then joined to a 4mm armoured cable in a 6" or 7" 60amp junction box under the floor near the back door.
The armour sheathing is connected to an earth cable which runs from the consumer unit to an earth stake outside.
This 4mm armoured cable (which is also approximately 14 metres long) then runs to the shed where inside, it reverts back to 4mm pvc covered cable (again via a 60amp juntion box; the armour sheath is not connected to anything at this end) and from there goes into a consumer unit (no rcd).
From this consumer unit there are 2 radial circuits, one in 1.5mm for lights with a 6amp mcb and the other radial circuit is 2.5mm feeding several sockets and protected by a 16amp mcb.
My question is can I replace the 16amp mcb's in the main house consumer unit and the shed consumer unit with 20amp mcb's?
Thanks for any advice.
