RE: Ring main question

["Dr John Tankard" <john@xxxxxxx>]

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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