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Joined: Feb 2005
Posts: 12,354 Likes: 4
Member
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Member
Joined: Feb 2005
Posts: 12,354 Likes: 4 |
Paul is correct. If you're running power and signal together all the cables got to be at the higher insulation rating.
Actually there are few instances where this is allowed. Per the NEC, LV and line voltage may be installed in the same raceway or enclosure ONLY if the LV wiring is necessary for the operation of the device that is line voltage powered.
In your elevator situation it's obvious that the elevator phone is not necessary for the elevator to operate but there are elevator codes that modify the NEC and that's probably what is happening here. I have never given a second thought how the wire is run. It's always been provided in the elevator machine room and the car so all I have to do is connect to it.
-Hal
CALIFORNIA PROPOSITION 65 WARNING: Some comments made by me are known to the State of California to cause irreversible brain damage and serious mental disorders leading to confinement.
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Joined: Dec 2002
Posts: 9,429 Likes: 3
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Member
Joined: Dec 2002
Posts: 9,429 Likes: 3 |
I never knew that Hal...interesting!
Jeff Moss
Moss Communications
Computer Repair-Networking-Cabling
MBSWWYPBX, JGAE
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Joined: May 2007
Posts: 5,059 Likes: 6
Moderator-1A2, Cabling
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Moderator-1A2, Cabling
Joined: May 2007
Posts: 5,059 Likes: 6 |
Hal -
Every elevator manufacturer does (or at least did) it differently. Sometimes the connection was to the machine room but often it was to a box midpoint in the shaft. We would have to ride the top of the car with the elevator constructor who was controlling the car with a handheld unit. Not my usual telephonic cable run!
I'm not as up on the NEC as I should be, but you must be right. Mostly when I've run LV & HV in the same pipe it's been for BMS systems where you did need the LV to work the HV equipment.
Here in the city until very recently we had our own electrical code which superceded the National code (much stricter). Even now that we're using the NEC we've got a whole slew of overriding addendums.
If I wasn't so close to retirement I'd probably take a class or read up, but I'm awfully close to following up on your signature and I just don't have the strength anymore. When I see what's going on in the industry I'm so happy I'm at the end of my career and not at the beginning.
Of course every old timer I ever worked with in the last 40 years said the same thing to me - so what does that mean?
Sam
"Where are we going and why are we in this hand basket?"
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