What kind of wire is this?

[timjimbob]

Coble is marked "P-122 Mesa"

I think it is a crane cable. 12/4 stranded with thick rubber jacket. It has no other designations, that I can find. I want to use as a 480 volt 3 phase extention cord for 17 ampsload.

[timebuilder]

Looks like it IS crane cable.

http://www.osha.gov/pls/imis/establi...ail?id=3002672

[timjimbob]

Any NEC reference or manufacturer stuff?

[second opinion]

Any NEC reference or manufacturer stuff?

Your cable would be listed in Article 400 and should have labeling every 24 inches on the surface to indicate the characteristics of the cable.

[timjimbob]

No mention of MESA or P122.

[wolfdog]

Look again. It is probably P-122 MSHA. (Mine Health Safety Administration) That is an additional rating that is given to cables for durability, flame spread, etc to qualify for use in mines. The same rated cable might be used in a washing machine.
The NEC does not show any cable assemblies in the #12-4 range that are not rated at least 600 volts.

http://www.southwire.com/ProductCata...catsheetOEM123

[timebuilder]

No mention of MESA or P122.

Read the accident report.

AN EMPLOYEE WAS TROUBLESHOOTING AN ELECTRICAL PROBLEM IN A 2-TON OVERHEAD CRANE. HE WAS USING A MESA EXTENSION CORD SET (TYPE P-122, 4-CONDUCTOR, 600-VOLT, 30-AMPERE).

[second opinion]

Look again. It is probably P-122 MSHA. (Mine Health Safety Administration) That is an additional rating that is given to cables for durability, flame spread, etc to qualify for use in mines. The same rated cable might be used in a washing machine.
The NEC does not show any cable assemblies in the #12-4 range that are not rated at least 600 volts.

http://www.southwire.com/ProductCata...catsheetOEM123

Wolfdog is correct it is MSHA P122 indicates the manufacturer of the cable, and is now owned by Southwire

[wolfdog]

Read the report and it should be fairly obvious it was a made up cord set.
A couple of other things don't add up, like the GFCI extension cord report on a 3 phase 30 amp 600 volt cord.



P-166 MSHA is a government standard for the mining industry.
http://www.msha.gov/TECHSUPP/ACC/lists/07cables.pdf