Aluminum Okopact Conductors
(1) Aluminum conductors are available on special order.
Ampacities
(2) Ampacities are in accordance with Table 310.73 of
the NEC for three single Type MV-90 conductors, or single conductors twisted
together (triplexed) and installed in an isolated conduit in air at an
ambient temperature of 40°C and a conductor temperature of 90°C.
(3) Ampacities are in accordance with Table 310.77 of
the NEC for three single conductors or triplexed cable in one underground
raceway, three feet deep with a conductor temperature of 90°C, 100% Load
Factor, an ambient earth temperature of 20°C, and thermal resistance (RHO)
of 90.
(4) Recommended sizes of rigid or nonmetallic conduit
for 3 conductors based on 40% maximum fill.
* The jam ratio, conduit I.D. to cable O.D., should be checked to avoid possible
jamming.