Electrical Engineering - Replacing a ceiling light fitting

Author

Replacing a ceiling light fitting

Mando

2007-04-11, 9:25 am

Hi all

Sorry to sound such a div, but I've got a simple wiring problem. I'm
replacing a ceiling light. There are 2 cables coming out of the
ceiling, that originally went into a ceiling rose terminal block (I
didn't make a not of how this was wired!). One cable has four wires
(red, blue, yellow, and one "naked"). The other cable has red L, black
N and green/yellow E.

How do I connect these to the new light fittings, which has just 2
Live and Neutral connectors?

Any help much appreciated.

Thanks

Paul

ehsjr

2007-04-11, 5:25 pm

Mando wrote:
> Hi all
>
> Sorry to sound such a div, but I've got a simple wiring problem. I'm
> replacing a ceiling light. There are 2 cables coming out of the
> ceiling, that originally went into a ceiling rose terminal block (I
> didn't make a not of how this was wired!). One cable has four wires
> (red, blue, yellow, and one "naked"). The other cable has red L, black
> N and green/yellow E.
>
> How do I connect these to the new light fittings, which has just 2
> Live and Neutral connectors?
>
> Any help much appreciated.
>
> Thanks
>
> Paul
>

You have these wires in the ceiling junction box:

---------+ +----------
-------+ | | +-------
-----+ | y R | +----
---+ | b e e b |
| r l l d l g
b e u l | K r
a d e o | | n
r | | w | | /
e | | | | | y
| | | | | | e
| | | | | | l
| | | | | | |
1 2 3 4 5 6 7

1 and 7 are both ground wires, and should be connected together
and to the ceiling junction box (assuming it's metalic).

The blk wire # 6 has been re-identified as neutral, so it should
be connected to white wires. If the yellow #4 is really a
discolored white, then it is a neutral wire. The white wires in
the fixture connect to neutral.

The red wire # 5 is live. The black wires in the fixture connect
to live, through a switch. The switch is probably wired to
the red #2 and blue # 3. If you have an ohmmeter, test for
continuity between the blue and red wires with the switch in
one position, and no continuity with the switch in the other
position. This must be done with power *off*. Assuming that
you get the correct results, connect the red #2 to the red # 5
and connect the blue # 3 to the black wires from the fixture.

By the way, the new light fixtures should have a bare
ground wire or a green grounding screw. A connection
should be made from the fixture ground to the #1 and #7
ground wires.

All of the above assumes a standard 120 volt light fixture
and wiring in the US.

Ed

Mando

2007-04-12, 9:25 am

On Apr 11, 8:50 pm, ehsjr <e...@bellatlantic.net> wrote:
> Mando wrote:
>
>
>
>
>
>
> You have these wires in the ceiling junction box:
>
> ---------+ +----------
> -------+ | | +-------
> -----+ | y R | +----
> ---+ | b e e b |
> | r l l d l g
> b e u l | K r
> a d e o | | n
> r | | w | | /
> e | | | | | y
> | | | | | | e
> | | | | | | l
> | | | | | | |
> 1 2 3 4 5 6 7
>
> 1 and 7 are both ground wires, and should be connected together
> and to the ceiling junction box (assuming it's metalic).
>
> The blk wire # 6 has been re-identified as neutral, so it should
> be connected to white wires. If the yellow #4 is really a
> discolored white, then it is a neutral wire. The white wires in
> the fixture connect to neutral.
>
> The red wire # 5 is live. The black wires in the fixture connect
> to live, through a switch. The switch is probably wired to
> the red #2 and blue # 3. If you have an ohmmeter, test for
> continuity between the blue and red wires with the switch in
> one position, and no continuity with the switch in the other
> position. This must be done with power *off*. Assuming that
> you get the correct results, connect the red #2 to the red # 5
> and connect the blue # 3 to the black wires from the fixture.
>
> By the way, the new light fixtures should have a bare
> ground wire or a green grounding screw. A connection
> should be made from the fixture ground to the #1 and #7
> ground wires.
>
> All of the above assumes a standard 120 volt light fixture
> and wiring in the US.
>
> Ed- Hide quoted text -
>
> - Show quoted text -

Thanks Ed

Much appreciated. I should have mentioned that I'm in the UK. Is there
any difference in wiring colors?

Cheers

Paul

ehsjr

2007-04-12, 9:25 am

Mando wrote:
> On Apr 11, 8:50 pm, ehsjr <e...@bellatlantic.net> wrote:
>
>
>
> Thanks Ed
>
> Much appreciated. I should have mentioned that I'm in the UK. Is there
> any difference in wiring colors?
>
> Cheers
>
> Paul
>
>

Sorry - I don't know the UK color codes. :-(

Ed

Andrew Gabriel

2007-04-12, 1:25 pm

In article <1176377076.858776.238850@d57g2000hsg.googlegroups.com>,
"Mando" <mandoswork@hotmail.com> writes:
>
> Much appreciated. I should have mentioned that I'm in the UK. Is there
> any difference in wiring colors?

Yes, completely different.
The colours you mention are standard UK colours.
However, it is unusual to have a triple and earth
cable into a ceiling rose, except in the case of
a bathroom with an extractor fan with run-on timer.
Is that where this ceiling rose is?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]

John McLean

2007-04-12, 5:25 pm

"Mando" <mandoswork@hotmail.com> wrote in message
news:1176297658.521685.6060@b75g2000hsg.googlegroups.com...
> Hi all
>
> Sorry to sound such a div, but I've got a simple wiring problem. I'm
> replacing a ceiling light. There are 2 cables coming out of the
> ceiling, that originally went into a ceiling rose terminal block (I
> didn't make a not of how this was wired!). One cable has four wires
> (red, blue, yellow, and one "naked"). The other cable has red L, black
> N and green/yellow E.
>
> How do I connect these to the new light fittings, which has just 2
> Live and Neutral connectors?
>
> Any help much appreciated.
>
> Thanks
>
> Paul
>

There are wiring diagrams which will probably help you in this link: -

http://www.diynot.com/forums/viewtopic.php?t=7553

LinkBot