wrote in message
...
On Mon, 11 Dec 2006 16:07:45 GMT, "Toller" wrote:

As I understand it, they are pretty much the same except that MC has a
ground and BX relies on the jacket as the ground. Any other differences?
Either harder to use?

How do you use the ground on BX, at the breaker box and junction box?
Does
it simply go through the mechanical connection at the box, or is there a
wire to attach?

If did a google search, but didn't come up with much.



You might have better luck with your search if you used type AC
instead of BX, which was a brand name.
The original product from Bronx cable (BX) was steel wound armor. It
is referred to in the NEC as Type AC.
A bonding strip was added later. This has a paper inner wrapper and
is dry location only. It requires an insulating bushing (AKA Read
Head) where it enters the box. It can be aluminum or steel armor
Type MC is a newer product using a similar armor, aluminum or steel.
The inner wrapper is plastic and newer versions can be listed for use
in wet locations. The insulation bushing is not necessary when used
with the proper connector. Traditionally the armor of type MC was not
listed for grounding and it came with an insulated green wire
grounding conductor, This is about to change. The newest version has a
large uninsulated bonding conductor in continuous contact with the
armor that will allow the armor to be the ground. It is not necessary
to terminate this bonding conductor and it is cut off flush with the
armor when you use the new bonding connector at the box.
Either MC or AC can have additional grounding conductors for
applications like hospitals.

I can buy BX (AC...) for $0.60/ft and MC for $1.10/ft. I don't care about
wet applications.
I don't know anything about their construction; it is internet and they
don't give any specs.

Any reason not to use the BX?
The vendor is Dale Electric. If you can suggest an alternative...
I also need a Murray 30/50 quad breaker for the project.