the conductor connecting to motor controllers ant to control devices are required to be what material?
Apr.18, 2011 in
Uncategorized
to NEC…
Welcome
In order to keep my other blogs on a positive note, I will post my gripe reports here.
April 18th, 2011 at 3:34 pm
Copper.
Not sources as such, but further reading material:
-Guns Germs and Steel by Jared Diamond
-A Cartoon History of the Universe by Larry Gonick (surprisingly in-depth for a quick 3-volume read, with lots of bibliographic material)
-the works of Karen Armstrong
Report this comment
April 18th, 2011 at 7:34 pm
You can use any conductive material in wire or cable form. The considerations are more on the insulation side and the type of environment. Copper can be replaced by higher grade alloys that are resistant to corrosion.
Not sources as such, but further reading material:
-Guns Germs and Steel by Jared Diamond
-A Cartoon History of the Universe by Larry Gonick (surprisingly in-depth for a quick 3-volume read, with lots of bibliographic material)
-the works of Karen Armstrong
Report this comment
April 19th, 2011 at 12:34 am
The conductor is typically copper, but can also be aluminum. The NEC recognizes aluminum in its tables, but makes adjustments for the heating affect. You must allow for larger conductor size when using Al.
Also, the spacing of these conductors as well as the insulation will determine the size required for the Ampacity rating of the conductor.
The NEC also requires a Short Circuit rating to be considered when sizing conductors, this is a critical characteristic that should not be over looked. A good reference for MCC (motor control center) is referenced below.
It is important to know which NEC your area has adopted. Each state in the USA reviews and approves the NEC. Not all states adopt the same version 2002, 2005 or 2008 or possibly portions of given version.
http://www.squared.com/us/products/motor_control.nsf/unid/BEABDD3D2C1FB03C85256EBE0047F560/$file/ul508aFrameset.htm
Report this comment