Simplified Guidelines for Motor Branch Circuits
®
as per National Electrical Code® (NEC ) Section 430
BASIC ELEMENTS OF A
MOTOR LOAD CIRCUIT
SUGGESTED USES FOR
V-EA AND MA-MCBs/
MANUAL MOTOR CONTROLLERS
Branch-Circuit Short Circuit (Part D) (430-(51-58))
and Ground-Fault Protection
(a circuit breaker or fuse)
V-EA Series Uses:
5
4
4
• Disconnect Means
3
• Controller
• Combination of Controller
and Overload Protection
• Combination of Controller and
2
3
&
Disconnecting Means (430-109 (a) (6))
(a motor-circuit switch rated in hp or a circuit breaker)
3
4
Disconnecting Means
&
Note:
For Combination of Controller, Disconnecting
2
3
,
Means and Overload Protection
,
Controller (Part G) (430-(81-91))
(any device normally used to start and stop a motor)
4
&
please check with the
3
local NEC® inspector for your area.
Overload Protection (Part C) (430-(31-44))
(a device with bimetallic elements or eutetic material
unless the motor is protected by other approval means)
MA Series Uses:
2
1
3
• Controller
• Combination of Controller and
2
3
Conductors (Part B) (430-(21-29))
(copper conductors unless identified for use with a
different conductor)
Overload Protection
&
Note:
Additional short circuit protection is
provided by the integral magnetic trip
feature.
M
®
Please check if NEC will permit a combination of these
Although these elements are shown separately, there
are certain cases where the code will permit a single
device to serve more than one function.
elements for your specific applications in a single
device.
Altech Corp.® • 35 Royal Road • Flemington, NJ 08822-6000 • Phone (908)806-9400 • FAX (908)806-9490 • www.altechcorp.com
5
ALTECH [ ALTECH CORPORATION ]
