My point is that most garage door openers do have facilities built into them to attach an external light to it.So you should not have to change or modify anything.
All three together is too much for a 13A !
But is a stove considered to be a continous load ?
If not then you may get away with it
because the chances are you will never use all three together,
and at the same time.
Most garage door openers do have facilities for attaching external lights to them,
I suggest you check yours, or even heaven forbid, read the instructions booklet,
most of which are readily available on line.
If you rewire these lights then you become legally responsible for thier safety,
So if you change anything from manufacturers original,
You are responsible.
It looks like a PITA to work on
BUT
we don't know the full story, and why it was done this way,
could have been a perfectily legitimate reason originally.
And considering it's age, it don't look too bad.
also bear in mind that if you go for high output LEDs
Then get the good quality ones
the market is full of cheap crappy one's
And whilst they work they don't last too long.
choose your color temp carefully,
Or the results will be varstly differant
sodium vapour lamps are orange in color
LED'S can be got in most color temps
I don't think that electrical code specifies which breaker size to use,
But it more likely says that the breaker must be able to protect the cable from over load.
So the size of the breaker depends on the size of the cable.
You need to sit down and do a proper load calculation,
then apply diversity that gives you a fair approximation.
but 80A is usually considered adaquate for most domestic situations.
You can even push it out to 100A If needed,
But 100A is the maximum for standard service drop.
Beyond that...
for power levels like that over such a dinstance will require much much bigger cables than you already use
and it's not going to be cheap !
I would guess at least 10mm cable.
Are you sure it's not a genuine circuit overload ?
It's very easy to over load a circuit with out knowing
perhaps there's more on this circuit than you realise.
and also consider the fact that he may be using cheap chinese graded stock !
it can only be one of two things,
1 - coils not receiving correct power, / so a volt meter should findthat one out !
Or
2 - the contactor has developed a fault / In which case I would also replace them both.
QUOTE - Could I even touch the neutral bus bar in my consumer unit and not get a shock?
Maybe.
if your instalation is bonded properly and grounded
then you should be able to touch the neutral bar.
My guess is that he is having trouble with the current ratings of readily available timers,
And wants to use the timer to control a relay and the relay switchs the pump motor.
You can get heavy duty timers for just such functions,
Or if he rally wants to use a relay than I would go the whole hog...
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