RE: 12v ring main

[Keith Doxey <keith.doxey@xxxxxxx>]

I would echo Nigels comments regarding running individual feed rather than
a
ring main.

Apart from the increased flexibility of individual cables, you avoid a
single point of failure.
If you do experience problems with one device not liking a shared PSU you
can supply it independantly again using the cable you installed.

Also if you get something that requires a 24v DC power supply or a 16v AC
supply you can mount the power supply at the central point and still use
the
cable for feeding the remotely mounted device, that would not be possible
with a ring.

>From a safety point of view you can also fuse each circuit
individually. Low
voltage power supplies whilst safe from a voltage point of view can have
very high current capability. For example the 5v rail in a Pc is ofter
40Amps or more. If you derive a standby 12v supply from a car battery that
can realise current in excess of 300 amps.

Not wishing to be alarmist....just pointing out some important points to
bear in mind.

Keith

> -----Original Message-----
> From: Nigel Orr [mailto:nigel@xxxxxxx]
> Separate 'spurs' to each point from a central supply(the
> mains equivalent
> is a radial circuit) would be better than a 'ring' covering
> several points,
> to minimise the current in each individual wire and so reduce
> losses.  2.5mm^2 mains twin and earth is probably the best
> thing to use,
> ideally pick a different colour from the rest of the house
> wiring (usually
> only available in grey or white) to help work out what's what
> later on!
>
> Nigel (another Nigel...)
>


-------------------------- eGroups Sponsor -------------------------~-~>
Dial 1-800-555-TELL -- You Won't Believe Your Ears!
For more details, click here:
http://click.egroups.com/1/9537/9/_/2065/_/971878386/
---------------------------------------------------------------------_->