Re: Running circuits together

[Frank Kurz <tech@xxxxxxxxxxxxx>]

On 20/03/2011 5:25 PM, JoeRaisin wrote:
> On 3/20/2011 7:56 PM, nick markowitz wrote:
>> On Mar 20, 1:38 pm, doug<doug3...@xxxxxxxxx> wrote:
>>> On Mar 20, 7:04 am, JoeRaisin<joeraisin2...@xxxxxxxxx> wrote:
>>>
>>>> Is there a code issue with running initiating circuits and notification
>>>> circuits in the same raceway?
>>>
>>>> Another tech made this assertion, but I think he is confusing it with
>>>> the out and return of a class A circuit.
>>>
>>> The system should be installed according to the manufacturers
>>> instructions, for example, Silent Knight installation manuals state
>>> that the circuits must be run in different conduits or if they must be
>>> run in the same conduit it should be for as short a distance as
>>> possible or you must use shielded cable.
>>>
>>> Doug
>>
>> Conventional panels not as much a problem but addressable you want to
>> keep them separate to avoid bleed over
>> where horns can some times be heard with a buzz in them when system is
>> in normal mode.from the noise the addressable loop can inject.
>> had a sub job one time I warned them to use twisted wire on the
>> addressable loop they didn't and it came over the restaurants fancy
>> sound system needless to say they had to strip all the wiring out and
>> replace with the right stuff. $$$
>> Some people never learn see it in high end houses all the time when
>> they try to use advanced panels with out the twisted wire.
>
> Thanks for the info guys. We are installing an MS-9600 and about 150
> horn strobes. There wasn't much area where the runs could be combined
> but I'll be sure to keep them apart.

I believe you'll find the MS-9600 requires shielded twisted pair wire
for the SLC loop.

It's perfectly acceptable to run NAC and SLC in the same conduit (but
not the same cable assembly).  In Canada our Installation Standard
states it's okay as long as one doesn't interfere with the other.  The
over-riding factor is the manufacturer's installation instructions.
These must be followed to the letter.

--
Frank Kurz
www.firetechs.net