Sparky11656
Member
The NFPA and UL508 require the use of yellow wire for wires that remain energized when the main disconnect to a panel is turned off. Does this also apply to low voltage 24 volts DC?
Yellow wire for external power source
- Thread starter Sparky11656
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STHOMAS
Member
- Location
- North County San Diego
what is the application...what is the 24 vdc being used for?
petersonra
Senior Member
- Location
- Northern illinois
- Occupation
- engineer
yes. voltage level is not an issue.
DM2-Inc
Senior Member
- Location
- Houston, Texas
Can you state the code sections in both standards?
RJohnsonMasterElectrician
Senior Member
- Location
- Right now ??, previously VT
would this apply to the control voltage (120v) THAT is being used in an elevator equipment from the shunt trip to the relay module / monitor module monitoring the power for alarm on a fire alarm system?
Just did my first elevator recall system and it was required and only way the system would work to keep the FA system from going into alarm. The power that feeds the shunt trip had to be hooked to the line side of the disconnect so if the elevator was to be worked on and the disconnect shut off the FA system wouldn't go off
Just did my first elevator recall system and it was required and only way the system would work to keep the FA system from going into alarm. The power that feeds the shunt trip had to be hooked to the line side of the disconnect so if the elevator was to be worked on and the disconnect shut off the FA system wouldn't go off
travisw
Member
- Location
- South Dakota
I think the color was changed to orange in the 2007 edition of NFPA 79.
NFPA 79 2007 Edition
13.2.4.1 The color ORANGE shall be used to identify ungrounded conductors that remain energized when the main supply circuit disconnecting means is in the off position. This color identification shall be strictly reserved for this application only.
NFPA 79 2007 Edition
13.2.4.1 The color ORANGE shall be used to identify ungrounded conductors that remain energized when the main supply circuit disconnecting means is in the off position. This color identification shall be strictly reserved for this application only.
richwaskowitz
Senior Member
- Location
- Shelby Twp. MI, near Detroit
Hold on there....
Hold on there....
NFPA 79 is a standard for "industrial machinery". UL 508A is a standard for "industrial control panels". They are not the same and apply to two different things. I am just stating this because sometimes people try to impose these standards on installations where they do not apply.
That having been said:
NFPA 79 13.2.4.1 calls for orange for the ungrounded conductors when they remain energized after the supply disconnecting means is in the off position.
Similarly, UL 508A 66.9.1 calls for yellow or orange but this is specifically for "internal wiring of controls circuits" (not power circuits) and it is in Part 2 "specific use industrial control panel types", not Part 1 "general use industrial control panels.
Hold on there....
NFPA 79 is a standard for "industrial machinery". UL 508A is a standard for "industrial control panels". They are not the same and apply to two different things. I am just stating this because sometimes people try to impose these standards on installations where they do not apply.
That having been said:
NFPA 79 13.2.4.1 calls for orange for the ungrounded conductors when they remain energized after the supply disconnecting means is in the off position.
Similarly, UL 508A 66.9.1 calls for yellow or orange but this is specifically for "internal wiring of controls circuits" (not power circuits) and it is in Part 2 "specific use industrial control panel types", not Part 1 "general use industrial control panels.
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