Specification

POLARIS™
Pre-Insulated Connectors
Max Ampacity for “Free Air” Installation:
NSi Industries LLC
800.321.5847
www.nsiindustries.com
SIZE OF
CONNECTOR
# OF
PARALLEL
CONDUCTORS
# OF
CONNECTOR
WIRE PORTS
COPPER
CONDUCTOR
(AMPS)
ALUMINUM
CONDUCTOR
(AMPS)
250
2 4 527 410
250
3 6 790 615
250
4 8 1053 820
350
2 4 657 514
350
3 6 985 770
350
4 8 1314 1028
500
2 4 806 631
500
3 6 1209 946
500
4 8 1612 1262
600
2 4 1035 810
600
3 6 1554 1215
600
4 8 2070 1620
750
2 4 1178 930
750
3 6 1767 1395
750
4 8 2356 1860
To enable users to achieve desired ampacity with a
UL listed pre-insulated connector through paralleling,
NSi Industries’ Polaris
™
line of connectors have been
fully tested and meet the specifications for UL 486
A/B for 90°C conductor (copper and aluminum) in
accordance with the National Electrical Code (NEC).
De-rating of conductors per the NEC can vary
depending on the type of installation (i.e. conductors
in free air, conductors in a wireway, number of
conductors in a wireway, etc.) and size of conductors
(250KCMIL-500KCMIL de-rated by 65%, 600KCMIL
and larger de-rated by 75%). It is expected that
the wire connectors will be used with parallel feeds
meeting the NEC. See the chart to the right that shows
the maximum ampacity for connectors, assuming a
“free air” installation.
Although these connectors have been tested in the
worst case condition (Line conductor(s) on one end of
the connector and load conductor(s) on opposite end
of connector), laboratory tests have shown that the
connector will run cooler if the load is “distributed”.
The recommendation is to stagger the line and load
conductors (line-load-line-load-line-load) throughout
the wire connector. If that is not possible, another
practice that would run cooler is to place the main/
line conductors in the center of the connector and
the load/tap conductors on the outer ports of the
connector.
SPECIFICATION
SHEET
PROJECT INFORMATION:
JOB:
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