Joined: 27 Aug 2003 Posts: 27420 Location: London, United Kingdom Thanked: 392 times
Posted: Mon Dec 19, 2005 11:14 pm Post Subject:
Presumably the octal socket takes a relay with a 230V coil, and you're using the right terminals - 2&7 for the coil and 6&8 for a pair of contacts?
And the contacts are rated at at least 13A, any load (e.g. reactive?)
OOI - any reason why you didn't use a rail mount contactor like this:
?
Anyway - observations
1) The relay & base and choc-block will need to be in an enclosure, and you'll need to provide some form of cord-grip for the three flexes.
2) The plug & socket at the bottom should be wired using 3-core flex. Even if what you plan to power via it doesn't need an earth, it is very bad practice to provide BS 1363 sockets without an earth...
What is this for?
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Joined: 24 Oct 2005 Posts: 124 Location: United Kingdom Thanked: 0 times
Posted: Mon Dec 19, 2005 11:20 pm Post Subject:
plugwash wrote:
well lets start with the obvious faults.
1: no enclosures or cord grips
2: no earths!
are fuses appropriately rated for the ratings of the contactors and cables?
what do you intend to use this for?
It's for a digital timer & a 600W aquarium light (the timer keeps blowing)
I was told to use a contactor which "handles" with the startup power thus not damaging my timer.
yeh 3A fuse which is efficient for what i need it for. (or so I am told)
I followed a guide to make this circuit, i just need to know if the circuit is right, forgot about encloser's for a minute, i just need to see if it works. (i will however be buying some ip hosing & enclosures)
oh & the earth... the guide said its optional...
Thanks for replying
edit: didnt see your post ban-sheds, yeh the light i got has got a earth which is connected to the ballast - How do add a earth to this circuit? ... just run a wiring out of the plug onto a piece of metal?
cheers mate
Last edited by Dave9 on Mon Dec 19, 2005 11:23 pm, edited 1 time in total
Joined: 24 Oct 2005 Posts: 124 Location: United Kingdom Thanked: 0 times
Posted: Mon Dec 19, 2005 11:25 pm Post Subject:
pdcelec wrote:
Oh no, not another wind up!
Please dont humiliate me again, i didnt post for this sort of treatment off people- i need help & frankly if your gonna be abusive to me then i will go.
ps: Thanks to the other people who posted with some real advice instead of acting egotistic like pdcdick.
thanks
Last edited by Dave9 on Mon Dec 19, 2005 11:28 pm, edited 1 time in total
Joined: 28 Mar 2004 Posts: 7263 Location: United Kingdom Thanked: 45 times
Posted: Mon Dec 19, 2005 11:27 pm Post Subject:
i don't know where you found this guide but as BAS said its extremly bad practice not to provide an earth to a british 3 pin socket since even if the equipment you have currently doesn't require earthing its going to be very easy to forget that you didn't provide an earth.
remember to restrain any flexes leaving an enclosure. probablly the easiest way to fo this is compression glands.
as for the wiring being correct or not it looks sane but i can't say for sure without knowing the pinout of the relay you plan to plug in to that base.
Joined: 03 Jan 2003 Posts: 23333 Location: Sussex, United Kingdom Thanked: 9 times
Posted: Mon Dec 19, 2005 11:32 pm Post Subject:
its a total waste.
why not do away with it all and just plug in what ever you are going to plug in, much easier.
The set up you have will operate the RELAY to ...................turn on the socket. (which will only work when the first plug is plugged in)
That is not what contactors are for, and as i already said, the missing part is a relay, not a contator
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Joined: 24 Oct 2005 Posts: 124 Location: United Kingdom Thanked: 0 times
Posted: Mon Dec 19, 2005 11:34 pm Post Subject:
plugwash wrote:
i don't know where you found this guide but as BAS said its extremly bad practice not to provide an earth to a british 3 pin socket since even if the equipment you have currently doesn't require earthing its going to be very easy to forget that you didn't provide an earth.
remember to restrain any flexes leaving an enclosure. probablly the easiest way to fo this is compression glands.
as for the wiring being correct or not it looks sane but i can't say for sure without knowing the pinout of the relay you plan to plug in to that base.
Thanks for that, so i need wire a earth wire to this circuit or will it be ok?
can i just wire a earth wire to the plug's & join them all to a metal place (which will be enclosed)
Joined: 27 Aug 2003 Posts: 27420 Location: London, United Kingdom Thanked: 392 times
Posted: Mon Dec 19, 2005 11:40 pm Post Subject:
Dave9 wrote:
edit: didnt see your post ban-sheds, yeh the light i got has got a earth which is connected to the ballast - How do add a earth to this circuit? ... just run a wiring out of the plug onto a piece of metal?
cheers mate
3-core flex from the bottom plug into the choc-block.
3-core flex from the choc-block to the trailing socket.
3-core flex from the light to its plug, and at the light connect the cpc to the earth terminal that the light must have if it needs an earth.
.....
PLAN B:
Use a rail-mount contactor and a rail-mount timer inside a small enclosure, with all the internal wiring kept inside, then all you'll need is 1 plug, 1 socket, 1 cable going in & 1 coming out.
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