Conductors in the Same Conduit
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Re: Conductors in the Same Conduit
If the answer to my above question is yes, would 517.30C (which requires the critical branch circuit in a hospital to be separate from the normal branches) apply to the low voltage conductors from a transformer feed from the critical branch?
Steve
If the answer to my above question is yes, would 517.30C (which requires the critical branch circuit in a hospital to be separate from the normal branches) apply to the low voltage conductors from a transformer feed from the critical branch?
Steve
Re: Conductors in the Same Conduit
Steve, are these low voltage conductors for operating lighting through the bed controls?
I have always kept these seperated from other voltages but am not sure if it's necessary.
517.30 (C)(3)exception# 2 indirectly implies there is no special consideration needed for these conductors, atleast in the "protection of".
Roger
Steve, are these low voltage conductors for operating lighting through the bed controls?
I have always kept these seperated from other voltages but am not sure if it's necessary.
517.30 (C)(3)exception# 2 indirectly implies there is no special consideration needed for these conductors, atleast in the "protection of".
Roger
Re: Conductors in the Same Conduit
If the lighting is part of the critical or life safety branch circuits than yes.If there not then no.
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Critical and life safety are not allowed to be in the same condit or box unless it is in a transfer switch exit or emergency lights fredd from two sources or a common box between them see 517-41(d)
If the lighting is part of the critical or life safety branch circuits than yes.If there not then no.
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Critical and life safety are not allowed to be in the same condit or box unless it is in a transfer switch exit or emergency lights fredd from two sources or a common box between them see 517-41(d)
Re: Conductors in the Same Conduit
Bonerac:
If we assume all the wiring is normal power (forget about health care stuff) can you provide a code reference that says low voltage can be ran with branch circuits? I would be thankful.
Roger;
Yes, these are for lights that are low voltage switched at the doorway and also tied into the switches at the bed. When the patient rooms were built (maybe 30 years ago), the electrical contractor ran one conduit to all the switches at the doorway. He/she then ran normal power, critical power, and low voltage in the same conduit.
Now I need to change a light over a bed to emergency power.
Thanks for pointing out Exception #2. I thought there was something dealing with transformers in article 517. After thinking about it awhile, this exception makes it clear that transformer secondary wiring is still part of the emergency system, and still has to meet the requirements of 517.30(c).
Steve
[ February 27, 2004, 03:45 PM: Message edited by: steve66 ]
Bonerac:
If we assume all the wiring is normal power (forget about health care stuff) can you provide a code reference that says low voltage can be ran with branch circuits? I would be thankful.
Roger;
Yes, these are for lights that are low voltage switched at the doorway and also tied into the switches at the bed. When the patient rooms were built (maybe 30 years ago), the electrical contractor ran one conduit to all the switches at the doorway. He/she then ran normal power, critical power, and low voltage in the same conduit.
Now I need to change a light over a bed to emergency power.
Thanks for pointing out Exception #2. I thought there was something dealing with transformers in article 517. After thinking about it awhile, this exception makes it clear that transformer secondary wiring is still part of the emergency system, and still has to meet the requirements of 517.30(c).
Steve
[ February 27, 2004, 03:45 PM: Message edited by: steve66 ]
Re: Conductors in the Same Conduit
Thanks Roger. For my paticular application (low voltage switches and dimmer switches):
Part A doesn't apply since the 20A circuit to the dimmers isn't class 1.
Part B1 doesn't apply since the equipment isn't functionally associated.
B2 through B4 doesn't apply since its not a control center, manhole, or cable tray.
I read this to mean the low voltage switch wiring can't be in the same conduit as the dimmer switch wiring. Am I reading this right?
Steve
Thanks Roger. For my paticular application (low voltage switches and dimmer switches):
Part A doesn't apply since the 20A circuit to the dimmers isn't class 1.
Part B1 doesn't apply since the equipment isn't functionally associated.
B2 through B4 doesn't apply since its not a control center, manhole, or cable tray.
I read this to mean the low voltage switch wiring can't be in the same conduit as the dimmer switch wiring. Am I reading this right?
Steve
pierre
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- Westchester County, New York
Re: Conductors in the Same Conduit
Steve
The low voltage wiring that you have is most likely class 2. The source of the system (transformer) is how you determine if it is class 2. 725.55 would be the section to reference if this is so. In most cases you cannot run class 2 in the raceway with lighting conductors from different equipment.
Pierre
Steve
The low voltage wiring that you have is most likely class 2. The source of the system (transformer) is how you determine if it is class 2. 725.55 would be the section to reference if this is so. In most cases you cannot run class 2 in the raceway with lighting conductors from different equipment.
Pierre
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