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Using solid core BT cable for wiring alarm? |
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| message from Rafal on 20 May 2004 |
Hi,
I might be in deep s..t. I have just installed alarm system wiring /200m+/
All nicely under the floor, walls made good already etc. When I started
testing
the wires I realized that Rexel Senate sold me 6 solid core bt cable instead
of
stranded alarm cable.Should have checked I know but it is to late now.
Is it going to be ok /I know it is stiffer and more difficult to squeeze in
to the sensors/
or should I rip it all out and put proper alarm cable?
Rafal
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| Christian McArdle replied to Rafal on 20 May 2004 |
I'd keep it. I'd be more worried about cross sectional area of conductors
than anything else. Probably the only real worry is the wiring to any
sounders/bell boxes, where the currents are much higher than the low
detector currents. If you have to replace any of it, then these will be the
ones to go.
Christian.
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| Dave Plowman replied to Christian McArdle on 20 May 2004 |
Both telephone and alarm cable have a nominal cross sectional area of
0.2mm squared.
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| Ric replied to Christian McArdle on 20 May 2004 |
I would imagine those old phones with the proper bells in them took a fair
bit of current!
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| Christian McArdle replied to Ric on 20 May 2004 |
Yeah, but think of the voltage drop if the bell's on the other side of the
house! I think I'll wire mine up in 1mm or so for that alone.
Christian.
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| Lurch replied to Christian McArdle on 20 May 2004 |
Are you taking the piss?
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| Lurch replied to Rafal on 20 May 2004 |
I wouldn't worry too much, I've seen plenty of alarms wired in CW1308
type cabling. It's not ideal but it will work fine.
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| BigWallop replied to Rafal on 20 May 2004 |
You shouldn't have any problems with it as long as you pick the colour pairs for each
section of the system. i.e.. orange pair for power, green pair for alarm and blue pair
for tamper. The twisted pair configuration will take care of the rest. The power on
the detectors and sounder circuits is measured in very small milliamps, so the cable
is well able to handle this.
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| Dave Plowman replied to BigWallop on 20 May 2004 |
Don't think pairs matter given that it's all DC. And wiring alarms so the
colours aren't the 'sensible' ones is usually a good idea.
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| Rafal replied to Rafal on 21 May 2004 |
Thanks a lot for putting my mind at rest.
My becon saved again...for now
Rafal
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| BigWallop replied to Rafal on 21 May 2004 |
Why for now ? What else have you done ? :-))
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| Lurch replied to BigWallop on 21 May 2004 |
I'm sure we'll find out!
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| Rafal replied to Lurch on 21 May 2004 |
Funny you should say that but this time is plumbing so new post.
Thanks
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| BigWallop replied to Rafal on 21 May 2004 |
LOL !!! We knew you'd be back. :-))
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Archived message: Using solid core BT cable for wiring alarm? (UK D-I-Y House Renovation)
