Wire-Bending Space in Power Junction Boxes?

[Rho_HV]

I am not real famliar with "Wire Bending Space" concept; so if I have a power junction box for a motor (VFD output), the wire bending space is the distance from termination point to the box entrance?

Also, we have 2x750MCM terminating in our power J-boxes, so per NEC2002 430.10, we need 19" from our bus lugs to the power junction box entance?

thanks

 

[Dennis Alwon]

I am not real famliar with "Wire Bending Space" concept; so if I have a power junction box for a motor (VFD output), the wire bending space is the distance from termination point to the box entrance?

Also, we have 2x750MCM terminating in our power J-boxes, so per NEC2002 430.10, we need 19" from our bus lugs to the power junction box entance?

thanks

I think you got it.

 

[mbeatty]

I am not real famliar with "Wire Bending Space" concept; so if I have a power junction box for a motor (VFD output), the wire bending space is the distance from termination point to the box entrance?

Also, we have 2x750MCM terminating in our power J-boxes, so per NEC2002 430.10, we need 19" from our bus lugs to the power junction box entance?

thanks

Just to clarify, per Table 312.6(B, note 1), Bending space at terminals should be measured in a straight line from the end of the lug or wire connector in a direction perpendicular to the enclosure wall.

IMHO, the enclosure wall, quite frequently, is not the same wall as where the entrance and/or exit is located.

 

[Rho_HV]

Just to clarify, per Table 312.6(B, note 1), Bending space at terminals should be measured in a straight line from the end of the lug or wire connector in a direction perpendicular to the enclosure wall.

IMHO, the enclosure wall, quite frequently, is not the same wall as where the entrance and/or exit is located.

wait a minute; so I have a power j-box for VFD output and customer is bringing 2x750MCM per lug, does that mean my box should be a 40"x40"x40" box with three bus lugs in the middle (per NEC 19" for 2x750MCM)?!!! Makes no sense.
You are correct about their wording but when they say "enclosure wall" I am sure they are talking about the gland plate (cable entry).