Ring Or Radial

[satsuma01]

Do low enery bulbs cause mcb trips? (Or 12v lighting for that matter?)

no low energy lamps (bulbs are found in the garden lamps are found in light fittings wont trip a mcb because they use gases inside like a flourescent light fitting tube, where as incandescent light fitting lamps has a metal filament across the lamps connection inside the globe glas part and again 12v lighting will not make a trip go if a lamp fails, the only time a mcb would trip is if there is a fault on the 240v side of the transformer or the cable itself.

hope this helps.

[Rulland]

The idea of the 'ring' circuit is that as the name suggests it's a ring-if a wire come adrift on a 'radial' you will lose all sockets downstream of that loose wire-whereas on a ring all sockets will still be 'live'-albeit you have no 'ring' anymore.

This is where as mentioned the testing on a ring circuit is more intensive-R1 + R2 etc etc-to tell you if the ring is a ring and the corresponding earth is true and good enough to 'trip' the relevent circuits under any fault conditions that may arise.

It has been suggested that a radial circuit be wired in 4.0mm cable-whereas a ring is obviously 2x2.5mm cable.

The 'split' RCD board is to minimize the dangers involved in circuits being disabled under fault conditions-ie upstairs lights and downstairs sockets on one RCD and downstairs lights and upstairs sockets on the other-it means you don't lose all lights or all sockets in one go-and thus is deemed to be safer for the user-won't fall down the stairs trying to get to the CU cos some lights will still be working-apparently-as Woosh though IMHO-load of bollox and red tape and more expense!.

Richard.

[luggsey]

There is a pile of c##p to be adhered to for the 17th edition a brief synopsos: ( I cant spell)

Unless the wires are:

1 morew than 2" into the wall

2 in steel eatherd conduit

The 16th allowed cables 'in zone' to be shallower then that, I didn't realise the 17th had changed it? (Haven't done 17th yet!!!)

[mojo]

1 mm cable carry out 5 amp maximum

2.5 mm carry out 13 amp maximum

to wire any sockets circuit in redial there isnt much load u can put on that example: Iron +Electric Heater THe breaker will trip.

That where the Ring circuit came from to incresase the capacity of current within safe measures

[Cubit]

1 mm cable carry out 5 amp maximum

2.5 mm carry out 13 amp maximum

to wire any sockets circuit in redial there isnt much load u can put on that example: Iron +Electric Heater THe breaker will trip.

That where the Ring circuit came from to incresase the capacity of current within safe measures

I see you are as expert in electrics as you are fire!!

[SUBS]

1 mm cable carry out 5 amp maximum

2.5 mm carry out 13 amp maximum

to wire any sockets circuit in redial there isnt much load u can put on that example: Iron +Electric Heater THe breaker will trip.

That where the Ring circuit came from to incresase the capacity of current within safe measures

Eh ?

[aismoresecur]

Eh ?