ABB MS116 Manual page 70

7.6.1.4 Group installations
A group installation is defined as two or more motors, or one or more motors and other loads, protected by a single
branch circuit protective device (BCPD). Group installations help to reduce both panel space, reduce the waste heat
in the panel and cost.
Group installations are permissible under NEC Article 430.53 in three instances, when either:
1. Each motor does not exceed 1 hp (6 A), and the upstream BCPD is no larger than 15 A.
2. Each motor circuit is individually protected against overload, with the BCPD sized for the smallest motor in
accordance with individual branch requirements. The BCPD should not open under normal operating condi-
tions for any load.
3. Each load is controlled, and each motor protected against overload conditions by devices listed for use in
group installations. The BCPD must additionally be sized properly to protect the group. As an exception, the
controllers and overload protection do not need to be listed for use in group installations if the upstream BCPD
does not exceed the maximum size allowed for the individual motor circuit.
In all instances, the individual load tap conductors must have an ampacity of at least 125% of the motor full-load cur-
rent. If the distance from the BCPD to the individual motor overload protection is not greater than 7.5 meters (25
feet), the tap conductors can be reduced to ⅓ the ampacity of the branch conductors. For longer distances, the am-
pacity of the individual load tap conductors must be equal to the branch circuit conductors. When the individual load
tap conductors are sized less than the branch circuit conductors, they must be protected from physical damage by
being enclosed in a raceway or another approved method.
Group installations are typically employed in Industrial Control Panels designed to control multiple motors and other
loads. Examples include a set of similarly sized loads (e.g. a fan bank), or a combination of a large main load and
smaller support loads (e.g. lubrication pumps or cooling fans).
ABB manual motor starters are suitable for use in group installations, and provide:
 An individual, lockable disconnect means for each load circuit
 Quick and compact group wiring using three-phase accessory busbar and coupling adaptors
Manual motor starters in a group installation
APR I L 19
MA N UA L MOTOR START ER G UI D E
Figure 41: Manual motor starters in a group installation.
Branch functional requirements
 Disconnect means
 Short-circuit and ground-fault protection
 Control means
 Overload protection
Application information
SCCR reference for MMS: "Group Installation"
SCCR ref. for controllers: Component-level
Maximum voltage: 600 Δ
Upstream branch protection: Required
7 0/80