[RE-wrenches] useful info on wire color coding

[Darryl Thayer]

see previous post if looking at the shaft of the motor, CW is clock wise ie Black-red-blue but but just because you have thoes colors does not mean it was done correctly.  always check rotation either with a rotation meter or with a motor by bumping the motor to check its rotation.

--- On Sat, 8/21/10, Marco Mangelsdorf <marco at pvthawaii.com> wrote:


From: Marco Mangelsdorf <marco at pvthawaii.com>
Subject: [RE-wrenches] useful info on wire color coding
To: "'RE-wrenches'" <re-wrenches at lists.re-wrenches.org>
Date: Saturday, August 21, 2010, 9:44 PM








But I’m still trying to determine if the black-red-blue and brown-orange-yellow sequences are appropriate for clockwise or counter-clockwise phase rotations.
 
marco
US, AC:The US National Electrical Code only mandates white (or grey) for the neutral power conductor and bare copper, green, or green with yellow stripe for the protective ground. In principle any other colors except these may be used for the power conductors. Black, red, and blue are used for 208 VAC three-phase; brown, orange and yellow are used for 480 VAC. Conductors larger than #6 AWG are only available in black and are color taped at the ends. 
US AC power circuit wiring color codes.




Function

label

Color, common

Color, alternative


Protective ground

PG

bare, green, or green-yellow 

green


Neutral

N

white

grey


Line, single phase

L

black or red (2nd hot)

 


Line, 3-phase

L1

black

brown


Line, 3-phase

L2

red

orange


Line, 3-phase

L3

blue

yellow





 

US DC power: The US National Electrical Code (for both AC and DC) mandates that the grounded neutral conductor of a power system be white or grey. The protective ground must be bare, green or green-yellow striped. Hot (active) wires may be any other colors except these. However, common practice (per local electrical inspectors) is for the first hot (live or active) wire to be black and the second hot to be red. The recommendations in Table below are by Wiles. [JWi] He makes no recommendation for ungrounded power system colors. Usage of the ungrounded system is discouraged for safety. However, red (+) and black (-) follows the coloring of the grounded systems in the table. 
US recommended DC power circuit wiring color codes.




Function

label

Color


Protective ground

PG

bare, green, or green-yellow


 2-wire ungrounded DC Power System

 

 


Positive

L+

no recommendation (red)


Negative

L-

no recommendation (black)


 2-wire grounded DC Power System

 

 


Positive (of a negative grounded) circuit

L+

red


Negative (of a negative grounded) circuit

N

white


Positive (of a positive grounded) circuit

N

white


Negative (of a positive grounded) circuit

L-

black


 3-wire grounded DC Power System

 

 


Positive

L+

red


Mid-wire (center tap)

N

white


Negative

L-

black
 
 
-----Inline Attachment Follows-----


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