4 wire smokes and EOL's

4 wire smokes and EOL's
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4 wire smokes and EOL's =?iso-8859-1?B?Q0iuSVM=?= 05-13-2009
Posted by =?iso-8859-1?B?Q0iuSVM=?= on May 13, 2009, 7:49 pm
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Ideally, you'd have only one smoke on a zone. Unfortunately, I didn't
install todays disaster where there are 9 smokes on 2 zones. Are zone
expanders really that expensive?

Anyway... I'm now wondering about how to do resistors correctly when you
have more than one smoke (either daisy chained or home run) on a zone. Do
you have a resistor in each smoke, or just one at the end. Being a normally
open contact (DSC 5010), it would make sense to have them in each smoke, but
I've seen them installed both ways.

- Chris


Posted by G. Morgan on May 13, 2009, 8:05 pm
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CH®IS wrote:

>Anyway... I'm now wondering about how to do resistors correctly when you
>have more than one smoke (either daisy chained or home run) on a zone. Do
>you have a resistor in each smoke, or just one at the end. Being a normally
>open contact (DSC 5010), it would make sense to have them in each smoke, but
>I've seen them installed both ways.

All the wiring goes in parallel to the last detector, with a single resistor
at the last smoke. Also, you may need a power supervision relay if the smoke
doesn't have it built in.

This is really basic stuff, it sounds like you don't have the experience to be
working on a fire alarm reliably. Please have someone who knows what they are
doing inspect your work.


Posted by =?iso-8859-1?B?Q0iuSVM=?= on May 14, 2009, 3:00 am
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> CH®IS wrote:
>
>>Anyway... I'm now wondering about how to do resistors correctly when you
>>have more than one smoke (either daisy chained or home run) on a zone. Do
>>you have a resistor in each smoke, or just one at the end. Being a
>>normally
>>open contact (DSC 5010), it would make sense to have them in each smoke,
>>but
>>I've seen them installed both ways.
>
> All the wiring goes in parallel to the last detector, with a single
> resistor
> at the last smoke. Also, you may need a power supervision relay if the
> smoke
> doesn't have it built in.
>
> This is really basic stuff, it sounds like you don't have the experience
> to be
> working on a fire alarm reliably. Please have someone who knows what they
> are
> doing inspect your work.
>

This would make sense, as I don't do fire alarms.

Although now I see why you'd just have one resistor. I was thinking since
it's an "open circuit", it's open, but it's not. However, if they're all
home run, there's no supervision for the rest of the smokes on that zone.

- Chris


Posted by G. Morgan on May 14, 2009, 6:38 am
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CH®IS wrote:

>
>Although now I see why you'd just have one resistor. I was thinking since
>it's an "open circuit", it's open, but it's not.

To the extent of the EOLR's value I guess you could say it's not "open"


>However, if they're all
>home run, there's no supervision for the rest of the smokes on that zone.

You can do it that way by running 6 pair cable to each.

Posted by Robert L Bass on May 14, 2009, 6:50 pm
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>
> You can do it that way by running 6 pair cable to each.

4-Conductor is enough for 2-wire smokes and 8-conductor will handle 4-wire
models unless you're running auxiliary relays or something. However, there
*might* be an issue with the inspector. Some I know mistakenly confuse the
requirement from old, Class "A" circuits that the "return" run be separate as
prohibiting this wiring scheme. I think they're wrong but there's that little
clause we all know and love, "The interpretation and application of this code
shall be subject to the discretion of the authority having jurisdiction." :^)

--

Regards,
Robert L Bass

==============================>
Bass Home Electronics
DIY Alarm and Home Automation Store
http://www.bassburglaralarms.com
Sales & Service 941-870-2310
Fax 941-870-3252
==============================>


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