Lighting question

I'm going to fit two lights in the same room. The problem is they don't
have line and neutral marked. If I get one the wrong way round will they
be in antiphase, and will this make the room get darker when I turn the
light on?

This is UK-DIY isn't it? I posted this message earlier but it didn't appear.

Bill

"Bill Wright" wrote in message
...
I'm going to fit two lights in the same room. The problem is
they don't have line and neutral marked. If I get one the wrong
way round will they be in antiphase, and will this make the
room get darker when I turn the light on?

This is UK-DIY isn't it? I posted this message earlier but it
didn't appear.

Bill



There is no polarity in normal lighting, other than it is the
live line that is switched, and there is no such thing as phasing
with lights as the element (incandescent) or phosphor (PLC) will
glow much longer than the mains frequency and as such will appear
continuous.

What may be confusing you is that modern wiring is a ring around
the fittings with a single (twin+earth) wire going to the switch.
There will be three reds (live) connected together - that is two
reds from the ring and one to the switch, two blacks (neutral)
from the ring connected together, and a single black return from
the switch (switched live) which may or may not be sleeved with a
different colour. The light connects between the single switched
live (now black or sleeved) and the two black neutrals that are
connected together. If any bare earths are present (there should
be three) they should be sleeved green/yellow and connected
together in the separate earth point.

Most modern ceiling roses will have three connectors fixed in
them: the three-hole connector at one end is for the lives (red,)
the three-hole connector in the middle is for neutral, and the
two-hole connector at the other end is for the switched live.


--
Woody

harrogate three at ntlworld dot com

"Woody" wrote in message
...
"Bill Wright" wrote in message
...
I'm going to fit two lights in the same room. The problem is
they don't have line and neutral marked. If I get one the
wrong way round will they be in antiphase, and will this make
the room get darker when I turn the light on?

This is UK-DIY isn't it? I posted this message earlier but it
didn't appear.

Bill



There is no polarity in normal lighting, other than it is the
live line that is switched, and there is no such thing as
phasing with lights as the element (incandescent) or phosphor
(PLC) will glow much longer than the mains frequency and as
such will appear continuous.

What may be confusing you is that modern wiring is a ring
around the fittings with a single (twin+earth) wire going to
the switch. There will be three reds (live) connected
together - that is two reds from the ring and one to the
switch, two blacks (neutral) from the ring connected together,
and a single black return from the switch (switched live) which
may or may not be sleeved with a different colour. The light
connects between the single switched live (now black or
sleeved) and the two black neutrals that are connected
together. If any bare earths are present (there should be
three) they should be sleeved green/yellow and connected
together in the separate earth point.

Most modern ceiling roses will have three connectors fixed in
them: the three-hole connector at one end is for the lives
(red,) the three-hole connector in the middle is for neutral,
and the two-hole connector at the other end is for the switched
live.


--
Woody

harrogate three at ntlworld dot com





Begger. I fell into that trap, didn't I?


--
Woody

harrogate three at ntlworld dot com

In article , Woody
scribeth thus
"Woody" wrote in message
...
"Bill Wright" wrote in message
...
I'm going to fit two lights in the same room. The problem is
they don't have line and neutral marked. If I get one the
wrong way round will they be in antiphase, and will this make
the room get darker when I turn the light on?

This is UK-DIY isn't it? I posted this message earlier but it
didn't appear.

Bill



There is no polarity in normal lighting, other than it is the
live line that is switched, and there is no such thing as
phasing with lights as the element (incandescent) or phosphor
(PLC) will glow much longer than the mains frequency and as
such will appear continuous.

What may be confusing you is that modern wiring is a ring
around the fittings with a single (twin+earth) wire going to
the switch. There will be three reds (live) connected
together - that is two reds from the ring and one to the
switch, two blacks (neutral) from the ring connected together,
and a single black return from the switch (switched live) which
may or may not be sleeved with a different colour. The light
connects between the single switched live (now black or
sleeved) and the two black neutrals that are connected
together. If any bare earths are present (there should be
three) they should be sleeved green/yellow and connected
together in the separate earth point.

Most modern ceiling roses will have three connectors fixed in
them: the three-hole connector at one end is for the lives
(red,) the three-hole connector in the middle is for neutral,
and the two-hole connector at the other end is for the switched
live.


--
Woody

harrogate three at ntlworld dot com





Begger. I fell into that trap, didn't I?


Yus!, Hook phase and neutral..
--
Tony Sayer

"Bill Wright" wrote in message ...
I'm going to fit two lights in the same room. The problem is they don't have line and neutral marked. If I get one the wrong way
round will they be in antiphase, and will this make the room get darker when I turn the light on?

This is UK-DIY isn't it? I posted this message earlier but it didn't appear.

Bill


Tesco were doing an offer of 11W CFL candle bulbs for 10p, so I got a basket full
for the hall chandeliers here at Graham Mansions.
I kid you not, when you turn them on the room gets darker!

It takes three full minutes for the brightness to approach that of those
that are already warmed up.
There's no good reason to keep Hg out of our children's brains if they
are going to die from falling down the stairs due light-bulbs deficient of same...

....And another thing, why do people say things like three full minutes, I mean if they
were half minutes that would have added up to 1½ minutes and I would have said so.



--
Graham.

%Profound_observation%

In message , Graham.
wrote

There's no good reason to keep Hg out of our children's brains if they
are going to die from falling down the stairs due light-bulbs deficient
of same...

Millions of people in the past have died falling down stairs because
they only had 1 candle power technology!
--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk

In message , Bill Wright
wrote
I'm going to fit two lights in the same room. The problem is they don't
have line and neutral marked. If I get one the wrong way round will
they be in antiphase, and will this make the room get darker when I
turn the light on?

Many people don't realise that when they fit three bulbs two can be in
phase and one can be out of phase. Simply by swapping the phase of the
one bulb they could get 66% more light.

--
Alan
news2009 {at} admac {dot} myzen {dot} co {dot} uk

In article ,
Bill Wright wrote:
I'm going to fit two lights in the same room. The problem is they don't
have line and neutral marked. If I get one the wrong way round will they
be in antiphase, and will this make the room get darker when I turn the
light on?

Best to fit Aldi CFLs. You won't then notice any difference when they're
on or off. Tesco ones automatically phase themselves in after about 5
minutes or so. This is why they appear to get brighter.

This is UK-DIY isn't it? I posted this message earlier but it didn't
appear.

They're very picky who they let post. Jamie got his arse kicked after his
first post.

--
*I believe five out of four people have trouble with fractions. *

Dave Plowman London SW
To e-mail, change noise into sound.

"Graham." wrote in message
...
"Bill Wright" wrote in message
...
I'm going to fit two lights in the same room. The problem is they don't
have line and neutral marked. If I get one the wrong way round will they
be in antiphase, and will this make the room get darker when I turn the
light on?

This is UK-DIY isn't it? I posted this message earlier but it didn't
appear.
Bill

Tesco were doing an offer of 11W CFL candle bulbs for 10p, so I got a
basket full
for the hall chandeliers here at Graham Mansions.
I kid you not, when you turn them on the room gets darker!

It takes three full minutes for the brightness to approach that of those
that are already warmed up.
There's no good reason to keep Hg out of our children's brains if they
are going to die from falling down the stairs due light-bulbs deficient of
same...

...And another thing, why do people say things like three full minutes, I
mean if they
were half minutes that would have added up to 1½ minutes and I would have
said so.
Graham.


You'll be binning them soon when LED bulbs get cheaper,
CFL bulbs are a dead technology.

LED Such as:
http://www.dealextreme.com/details.dx/sku.37161

Steve Terry
--
"I would like to plead for my right to investigate natural phenomena
without having guns pointed at me.
I also ask for the right to be wrong without being hanged for it."
- Wilhelm Reich, November 1947

"Dave Plowman (News)" wrote in message
...

They're very picky who they let post. Jamie got his arse kicked after his
first post.

In your dreams, Plowfool.
(he's very bitter because I made a fool out of him).

jamie.
--