Red Book - Long Island Power Authority

9.4 STARTING CURRENT LIMITS FOR SINGLE PHASE MOTORS
36
Section 9 – Motors and Controllers
9.4.1 LIPA must be notified of any single phase motor installation totaling 3 HP or more,
as it may be necessary, in such cases, to effect changes in the supply system to
serve the additional load.
9.4.2 All single phase motor driven equipment rated larger than 1 HP must be
connected for operation at 240 volts unless arranged as part of an approved three
phase installation.
9.4.3 Tables I and II list the maximum starting currents permitted at 120 or 240 volts
single phase for conventional motorized equipment rated in horsepower and for air
conditioning or heat pump equipment rated in BTU's per hour. These limits are
permitted only for motors normally expected to start not more than four times per
hour. For convenience, the tables include the NEMA Code designation of motors
which will start without exceeding the prescribed starting current limits and without
requiring auxiliary starting devices.
Operating
Voltage
Table I
Motor Starting Limitations
Single Phase Equipment With Motors Rated
In Horsepower
Motor Size
(HP)
Maximum Starting
Current Amp.
NEMA
Code Letter
120 ½ 50 A to M
120 ¾ 50 A to J
120 1 50 A to G
240 ½ 60 A to S
240 ¾ 60 A to P
240 1 60 A to H
240 2 60 A to G
240 3 80
A to B
240 5 120
A
In excess of 5
HP
(see note)