Power-Supply Conductor
in.J

Full-Load Terminal Box

Current for Minimum Usable Volume

Motors with Dimensions Minimum

Maximum of

6 Leads

(Amperes) mm in. cm 3 in.3

68 65 2.5 425 26

105 84 3.3 900 55

165 100 4.0 1,640 100

240 125 5.0 2,950 180

375 150 6.0 5,410 330

600 175 7.0 9,840 600

900 200 8.0 18,040 1,100

Note: Auxiliary leads for such items as brakes, thermostats, space heaters, and exciting fields shall be permitted to be neglected if their current-carrying area does not exceed 25 percent of the current-carrying area of the machine power leads.
"For motors rated 1 hp and smaller and with the terminal housing partially or wholly integral with the frame or end shield, the volume of the terminal housing shall not be less than 18.0 cm 3 (1.1 in?) per wire-to-wire connection. The minimum cover opening dimension is not specified. bFor motors rated I '/>, 2, and 3 hp and with the terminal housing partially or wholly integral with the frame or end shield, the volume of the terminal housing shall not be less than 23.0 cnr 1 (1.4 in. 3) per wire-to-wire connection. The minimum cover opening dimension is not specified.
Table 430.12(C)(1) Terminal Spacings — Fixed
Terminals
Conductor cm

14 16 1

12 and 10 20 l'/4

8 and 6 37 2'/4

(D) Large Wire or Factory Connections. For motors with larger ratings, greater number of leads, or larger wire sizes, or where motors are installed as a part of factory- wired equipment, without additional connection being required at the motor terminal housing during equipment installation, the terminal housing shall be of ample size to make connections, but the foregoing provisions for the volumes of terminal housings shall not be considered applicable.
(E) Equipment Grounding Connections. A means for at- tachment of an equipment grounding conductor termination in accordance with 250.8 shall be provided at motor terminal housings for wire-to-wire connections or fixed terminal connections. The means for such connections shall be permitted to be located either inside or outside the motor terminal housing.

Exception: Where a motor is installed as a part of factory-wired equipment that is required to be grounded and without additional connection being required at the motor terminal housing during equipment installation, a separate means for motor grounding at the motor terminal housing shall not be required.

430.13 Bushing. Where wires pass through an opening in

an enclosure, conduit box, or barrier, a bushing shall be used to protect the conductors from the edges of openings
having sharp edges. The bushing shall have smooth, well-
rounded surfaces where it may be in contact with the
con
ductors. If used where oils, greases, or other
contaminants
may be present, the bushing shall be made of material
not
deleteriously affected.
FPN: For conductors exposed to deteriorating agents, see 310.9.

430.14 Location of Motors.

(A) Ventilation and Maintenance. Motors shall be lo cated so that adequate ventilation is provided and so that maintenance, such as lubrication of bearings and replacing of brushes, can be readily accomplished.

Exception: Ventilation