UL 508 A Control Panel

[Seaweed]

Does UL 508 A have a color code for wiring control panel??

 

[arcsnsparks98]

I found this from a Mike Holt Forum thread a few years ago when this was discussed.

UL-508A Manual section 66.9 gives a color code for internal control wiring.
It is as follows:
a) Black - all ungrounded control circuit conductors operating at the supply
voltage.
b) Red - ungrounded ac control circuits operating at a voltage less than the
supply voltage.
c) Blue - ungrounded dc control circuits.
d) Yellow - ungrounded control circuits or other wiring, such as for cabinet
lighting, that remain energized when the main disconnect is in the "off"
position.
e) White or natural gray - grounded ac current carrying control circuit
conductor regardless of voltage.'
f) White with blue stripe - grounded dc current carrying control circuit
conductor.
g) White with yellow stripe - grounded ac control circuit current carrying
conductor that remains energized when the main disconnect switch is in the
"off" position.
Exception: Leads on assembled components, multiconductor cable, leads
used to connect electronic devices, and conductor sizes 20-30 AWG are not
required to comply with this requirement.




?Hopefully this will help.

 

[Seaweed]

I found this from a Mike Holt Forum thread a few years ago when this was discussed.

UL-508A Manual section 66.9 gives a color code for internal control wiring.
It is as follows:
a) Black - all ungrounded control circuit conductors operating at the supply
voltage.
b) Red - ungrounded ac control circuits operating at a voltage less than the
supply voltage.
c) Blue - ungrounded dc control circuits.
d) Yellow - ungrounded control circuits or other wiring, such as for cabinet
lighting, that remain energized when the main disconnect is in the "off"
position.
e) White or natural gray - grounded ac current carrying control circuit
conductor regardless of voltage.'
f) White with blue stripe - grounded dc current carrying control circuit
conductor.
g) White with yellow stripe - grounded ac control circuit current carrying
conductor that remains energized when the main disconnect switch is in the
"off" position.
Exception: Leads on assembled components, multiconductor cable, leads
used to connect electronic devices, and conductor sizes 20-30 AWG are not
required to comply with this requirement.




?Hopefully this will help.

Thanks

 

[bward]

Having worked for a few 508/508A shops before, this isn't always followed and the devices can still be listed, so please double check where a wire goes to before assuming what it does. Schematics and Wire Numbers are your friend - many devices have schematics inside the enclosure door.