1-6 Installation/Wiring
The PowerFlex 4 does not provide branch short circuit protection. This
product should be installed with either input fuses or an input circuit
breaker. National and local industrial safety regulations and/or electrical
codes may determine additional requirements for these installations.
Fusing
The PowerFlex 4 has been UL tested and approved for use with input
fuses. The ratings in the table that follows are the minimum
recommended values for use with each drive rating. The devices listed in
this table are provided to serve as a guide. Other devices which meet the
requirements of UL508C and UL489 with similar trip characteristics
may be used in order to meet local or national electrical codes.
Bulletin 140 Manual Motor Starters/UL489 Circuit Breakers
When using Bulletin 140 manual motor starters or UL489 rated circuit
breakers, the guidelines listed below must be followed in order to meet
the NEC requirements for branch circuit protection.
• Bulletin 140 manual motor starters can be used in single and group
motor applications.
• In single motor applications, a fuse or UL489 rated circuit breaker is
required ahead of the Bulletin 140 manual motor starter.
• In group motor installations, the Bulletin 140 can be used for
protection of an individual motor within the group and “one set” of
fuses or a UL489 rated circuit breaker serves as the Branch Circuit
Protective Device for the entire “Group Installation”.
• If the installation is not required to meet NEC requirements, Bulletin
140M manual motor starters can be used in single and group motor
applications without additional short circuit protection. Refer to the
technical support literature for the 140M for more details.
Fuses and Circuit Breakers
!
ATTENTION: To guard against personal injury and/or equipment
damage caused by improper fusing or circuit breaker selection, use only
the recommended line fuses/circuit breakers specified in this section.
userman.book Page 6 Friday, June 21, 2002 2:48 PM
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