Re: Urgent question on AW10's

[Kevin Hawkins <tivo@xxxxxxx>]

Title: Re: [ukha_d] Urgent question on AW10's

   I must really say that I am gob smacked here - Mains IS a
problem and it is lethal. Treat it with the utmost respect. There is an
inference from this post you can experiment with live mains if you have an
RCB all will be well - and that if you dont you'll just blow a fuse. This
is NOT true and I don't think Kenneth meant it to sound that way. It's just
ambiguous.

Whilst most 'sparkies'  flaunt the risks they also do so in an
educated way. Whilst it is probable that you are unlikey to come to harm
with RCB's in circuit the biggest risk is not knowing if they are
protecting you, particularly if you are not knowledgeable.  

    I would strongly recommend - let me rephrase that -
ABSOLUTELY INSIST - that you NEVER NEVER work on a live mains circuit -
always ensure that the fuse is removed (or tripped) for that circuit before
you do anything. ( also make sure also that no other person will reset the
fuse if it is a trip type eg for a lighting circuit shared with other
people).  Use a mains neon tester on the live wire to prove the
circuit is dead, Make sure you are reasonably well earthed when you do this
(it makes the neon indicator brighter and more definative) - and only ever
physically touch the top end of the screwdriver.

   Having said that what you are trying to achieve here is
fairly straight forward and lots of people here can give you advice. The
timers are likely to be fed by one common llive supply (brown or red wire)
that is split into 3 switched live supplies after the timer switches (still
red or brown wires) it is each of these 3 that you need to intercept and
either connect in series with through a relay (Timer ON permanent) or in
parallel with from the main supply to the switched (Timer OFF permanently).

   I you have a fax I will send you a sketch of what to do
if that would help but please never get complacent about the mains - and
never work on it live even if there is an RCB on the supply. If in doubt
get an electrician in.

   I am sorry if I am ranting and raving to people who know
all these things but I have a past experience in this area that I would
never wish to see happen again.

   Kevin

on 23/4/01 12:43 am, Kenneth Watt at kennethwatt@xxxxxxx wrote:

> Mains is not a problem, you just need to follow some basic rules and have
> a
> meter to hand :o) anyway, a little jolt is good for the heart now and
> then,
> at least that's what my boss used to tell me! Don't worry about
> experimenting, particularly if you have an RCD unit, you really can't do
> any
> harm if you have one of those. Fused supplies are a bit more tricky if
> you
> do the wrong thing, but still as long as your not holding an open live
> &
> neutral the worst you can do is pop a fuse.

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