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Re: Ring main question
Basically Twin+E usually 2.5mm squared (carnt do symbol for squared) starts
at one fuse in fuse box and then goes to each socket in turn and then from
the last socket back to the same fuse in the fusebox.
It is normal to have seperate circuits one for downstairs and one for
upstairs, occasionally a seperate cicuit may be required to feed the
kitchen
if a large numbe of electrical appliances are used inparticular seperate
electric hobs and ovens.
For IEE wiring regulations try http://www.iee.org/Publish/WireRegs/
where
lots of info can be obtained.
Regards
Paul H
----- Original Message -----
From: "Dr John Tankard" <john@xxxxxxx>
To: <ukha_d@xxxxxxx>
Sent: Thursday, March 07, 2002 1:37 PM
Subject: RE: [ukha_d] Ring main question
> Its wrong should only have one fuse.
>
> John
>
> > -----Original Message-----
> > From: Robert Chasmer [mailto:robert.chasmer@xxxxxxx]
> > Sent: 07 March 2002 12:43
> > To: Home Automation List (E-mail)
> > Subject: [ukha_d] Ring main question
> >
> >
> > Hi, I wonder if anyone on the list could give me some advice
> > on the following.
> >
> > I was helping a friend at the weekend move some mains sockets
> > and add an addional one. Originally he intended to simply
> > create spurs of the existing sockets, but I persuaded him to
> > extend the current ring main instead.
> >
> > As we began work, I started off my turning of the mains at
> > his fuse box. He has a number of tripswitch fuses marked as
> > the following:- 1 x Cooker 1 x Upstairs lighting 1 x
> > Downstarirs lighting 2 x Sockets
> >
> > Now as there were two fuses marked sockets I expected one to
> > be for the upstairs ring, and one for the downstairs ring.
> > The girls we watching telly in the lounge so I promply
> > tripped one of the socket fuses. ...Telly still On... Ok so
> > reset that fuse back on and trip the other fuse. ...Telly
> > still on... Ok trip both fuses... Telly goes off.
> >
> > So it seems that the ring main is feed by two fuses, one in
> > each direction.
> >
> > MAINS
> >
> > +--- Socket 8 ------ Fuse --+-- Fuse ------ Socket 1 ---+
> >
> > Socket 7 Socket
2
> >
> > +--- Socket 6 --- Socket 5 --- Socket 4 --- Socket 3 ---+
> >
> > How is a normal ring main fused, does each direction of the
> > ring simply terminate into the same fuse like a socket?
> >
> > --
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> > / /__/ / / / / / / / / / _____/ / Rob Chasmer, MMT Computing
> > ______/ _/ /_/ _/ /_/ ______/ robert.chasmer@xxxxxxx
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