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#204127 - 11/14/11 09:37 PM mixing of systems?  
triple  Offline
Member
Joined: Apr 2002
Posts: 184
Wisconsin
Can the low-volt wiring to a generator annunciator panel pass through the same junction box (without a partition) containing low-volt wiring corresponding to medical gas valves, gauges, and controls in a hospital?


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#204136 - 11/15/11 07:48 PM Re: mixing of systems? [Re: triple]  
sabrown  Offline
Member
Joined: Dec 2002
Posts: 302
Ogden, Utah, USA
I do not know, but I would ask myself this as a quick test to say no. Is the system that I plan on mixing with a critical system. If it were I would not ask any further. My opinion here is not worth anything, but I noticed you were on rright now and that no one had responded.


#204137 - 11/15/11 08:52 PM Re: mixing of systems? [Re: triple]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,885
Brick, NJ USA
I have to agree with sabrown. I can't put a specific article on it. It's best to stay away from the critical system.


John

#204139 - 11/15/11 10:16 PM Re: mixing of systems? [Re: triple]  
gfretwell  Online Content


Member
Joined: Jul 2004
Posts: 9,143
Estero,Fl,usa
Is this a 517.30(C)(1) thing? What is the generator doing?


Greg Fretwell

#204140 - 11/15/11 11:42 PM Re: mixing of systems? [Re: triple]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,885
Brick, NJ USA
Greg:
IMHO, to provide an answer of allowed or not, a lot more details would have to be provided by the OP. He mentioned 'critical system', gas valves, control and no specific area for the 'j' box. I'm curious if he has any plans/specs. for the install.



John

#204161 - 11/17/11 02:15 PM Re: mixing of systems? [Re: triple]  
Yoopersup  Offline
Member
Joined: Mar 2003
Posts: 840
Michigan
I don't know if Ann. wires come into this but read .
700.9 (B) p. 1108 2008 handbook & (D)3 page 1112 2008 nec code handbook.

Yoopersup


#204186 - 11/18/11 10:06 PM Re: mixing of systems? [Re: triple]  
triple  Offline
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Joined: Apr 2002
Posts: 184
Wisconsin
Medical gases are oxygen, nitrogen oxide, and oxygen. They are piped to many rooms in a hospital. Gauges read their pressures and go into alarm when not within spec. I never mentioned "critical systems" but of coarse the most important purpose of the generator in a hospital is to provide critical and emergency power when called upon to do so. Generator annunciator wiring is not circuit wiring. Both the med-gas and generator wires I am describing are for status indicating only. The conductors feeding the gas valves I mentioned before are actually fed separately.


#204193 - 11/19/11 04:11 AM Re: mixing of systems? [Re: triple]  
Trumpy  Offline


Member
Joined: Jul 2002
Posts: 8,223
SI,New Zealand
On the face of it,
I would say no.
Make life easier for yourself and just run a seperate conduit.
At least then there will be no question of your stuff mucking up anything that has been pre-installed.
Even though we are talking about low-level signalling stuff here, its best to have some sort of segregation, even if for fault-finding purposes down the track.
By that I mean, who hasn't opened up a but of wire troughing and found a tonne of wires all the same colour?

Also with new conduit, you have the opportunity to identify your work as being say "GEN-ANN" along the way.

Just my thoughts.



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