ECN Forum Forums Code Related Discussion NEC & other Code issues MC cable supported by ariel Cable . Amperage rate?

Yop:
310.20 IMHO is for triplex type (or field assembled) type of conductors, not for 'cable' (conductors within an outer jacket/sheath).

310.16 is where I would take this, and ambient temp may also have to be considered.

Table B 310.3 references multiconductor cables in free air.

As to MV, none of the Annex B tables refer to cable on messenger in free air. The notes refer to 'engineering data' or use of the tables. You could give the MC mfg a call/email for their input, or perhaps they already have the eng. data

what about for MV cable.
310.71
Ampacities of an Insulated Three-conductor copper Cable
Isolated in air based on conductor temperatures of 90C & 105C, and ambient air temperature of 40c.

Per code MC cable is a cable assembly not a raceway per NEC article 100.
So all referances to MC for Amperage ect is on a cable assembly.
310.16 on MC in air would be right.
Thanks Hotline 1 for your imput.
Yoopersup