wire color code

[michael.howard]

working a production as a maintenance tech. and heard that dc circiut wires need to be blue but can not find any refernce to that fact just wnated some insight on the subject.

 

[pwhite]

Re: wire color code

michael,

try nfpa 79 - electrical standard for industrial machinery. page 79-31 section 61 (wiring methods & practices).
section 16.1.3 "the use of other colors for the purpose of identification shall be as follows:"..... "- Blue: Ungrounded dc control conductors"

hope this helps.
most of the industries i have worked with use blue colored wire to designate 24 volts dc, both +24 volts and 0 volt terminal. one customer uses white to designate the 0 volt wire of the 24 volt circuit.

regards,
p white

 

[tom baker]

Re: wire color code

If its a grounded DC conductor, the required color code per NPFA 79 and its equal IEC standard is white with a blue stripe.

 

[pwhite]

Re: wire color code

tom,
thanks, i missed that one.

 

[james wuebker]

Re: wire color code

Where I work we have plastic molding machines. In the control cabinets the colors are:
blue- +24vdv
purple- 0vdc
red- 120vac
black- 240vac

These are Engel machines. I hope this will help.
Bye now!