430.22

Status
Not open for further replies.
R

RICK NAPIER

Senior Member
Location
New Jersey
If you met the requirements 430.22 A or B would you be allowed to use 16 awg wiring.

430.22 Single Motor. Conductors that supply a single motor
used in a continuous duty application shall have an
ampacity of not less than 125 percent of the motor full-load
current rating, as determined by 430.6(A)(1), or not less
than specified in 430.22(A) through (G).
(A) Direct-Current Motor-Rectifier Supplied. For dc
motors operating from a rectified power supply, the conductor
ampacity on the input of the rectifier shall not be
less than 125 percent of the rated input current to the rectifier.
For dc motors operating from a rectified single-phase
power supply, the conductors between the field wiring output
terminals of the rectifier and the motor shall have an
ampacity of not less than the following percentages of the
motor full-load current rating:
(1) Where a rectifier bridge of the single-phase, half-wave
type is used, 190 percent.
(2) Where a rectifier bridge of the single-phase, full-wave
type is used, 150 percent.
(B) Multispeed Motor. For a multispeed motor, the selection
of branch-circuit conductors on the line side of the
controller shall be based on the highest of the full-load
current ratings shown on the motor nameplate. The ampacity
of the branch-circuit conductors between the controller and
the motor shall not be less than 125 percent of the current
rating of the winding(s) that the conductors energize.
 
RICK NAPIER said:
If you met the requirements 430.22 A or B would you be allowed to use 16 awg wiring.

430.22 Single Motor. Conductors that supply a single motor
used in a continuous duty application shall have an
ampacity of not less than 125 percent of the motor full-load
current rating, as determined by 430.6(A)(1), or not less
than specified in 430.22(A) through (G).
(A) Direct-Current Motor-Rectifier Supplied. For dc
motors operating from a rectified power supply, the conductor
ampacity on the input of the rectifier shall not be
less than 125 percent of the rated input current to the rectifier.
For dc motors operating from a rectified single-phase
power supply, the conductors between the field wiring output
terminals of the rectifier and the motor shall have an
ampacity of not less than the following percentages of the
motor full-load current rating:
(1) Where a rectifier bridge of the single-phase, half-wave
type is used, 190 percent.
(2) Where a rectifier bridge of the single-phase, full-wave
type is used, 150 percent.
(B) Multispeed Motor. For a multispeed motor, the selection
of branch-circuit conductors on the line side of the
controller shall be based on the highest of the full-load
current ratings shown on the motor nameplate. The ampacity
of the branch-circuit conductors between the controller and
the motor shall not be less than 125 percent of the current
rating of the winding(s) that the conductors energize.
Click to expand...

Rick, don't we need the rated input current of the rectifier to answer this question?
 
I thought that but in discussion with some engineers they were taking the position that if it met (A) or (B) they did not need to conform with the other requirements and were allowed to be 16awg.
 
RICK NAPIER said:
I thought that but in discussion with some engineer
Click to expand...

Are you looking at premises wiring, wiring internal to a control panel, or wiring on a single piece of industrial equipment?
Is the wiring subject to other standards like UL508A?
 
gadfly56 said:
In the context of 430.22 (A) or (B), such conductor sizes are not forbidden.
Click to expand...

Okay, I'll try it again...

Conductors smaller than #14 are forbidden, unless specifically permitted.

There's nothing in 430.22(A) or (B) that permits conductor sizes smaller than #14....

In the context of 430.22(A) or (B), conductors smaller than #14 are forbidden.
 
david luchini said:
Okay, I'll try it again...

Conductors smaller than #14 are forbidden, unless specifically permitted.

There's nothing in 430.22(A) or (B) that permits conductor sizes smaller than #14....

In the context of 430.22(A) or (B), conductors smaller than #14 are forbidden.
Click to expand...

See G(1) and G(2). Outside those exceptions I would agree with you.
 
David,
I don't understand. If you meet the criteria of 430.22(G) why would it not be permissible to use the #16 as 430.22 sates comply with (A) through (G) ?
 
augie47 said:
David,
I don't understand. If you meet the criteria of 430.22(G) why would it not be permissible to use the #16 as 430.22 sates comply with (A) through (G) ?
Click to expand...

Gus, I think you've misread something. I've indicated that 430.22(G) permits the use of smaller than #14 conductors...430.22(A) and (B) give no such permission.
 
RICK NAPIER said:
Thanks for your comments I was gone for a few days picking up my son from Parris Island he just graduated boot camp as a new PFC Marine.
Click to expand...

Ooooo Rahhh!

I'm a few years away from that possibility with my oldest, although he doesn't show any inclination. I keep thinking what kind of nervous wreck I would be if he ever got deployed.
 
Status
Not open for further replies.
Top