Single Motor -- Conductor Size
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The designations "National Electrical Code” and “NEC” refer to the
National Electrical Code®, which is a registered
trademark of the
National Fire Protection Association.
Top 50 NEC Rules
Single Motor -- Conductor Size
By Mike Holt
Conductors to a single motor must be sized not smaller
than 125% of the motor FLC rating as listed in:
- Table 430.247 Direct Current Motors
- Table 430.248 Single-Phase Motors
- Table 430.250 Three-Phase Motors
Editor's note: This information was extracted from Mike
the National Electrical Code
The Fluke 1735 Power Logger is the ideal electrician or technician's
power meter for conducting energy studies and basic power quality
logging. Set the Power Logger up in seconds with the included flexible
current probes and color display. The power quality meter measures most
electrical power parameters, harmonics, and captures voltage events. www.fluke.com/codewatch
What's Wrong Here?
By Joe Tedesco
Think you know how this installation violates the
NEC? Visit EC&M's
Web site to see the answer.
Hint: Christmas in February.
By Mike Holt
Q. What are the Code requirements for bonding
bushings on 277V or 480V branch and feeder and circuits?
Visit EC&M's Web
site to see the answer.
By Steven Owen
Q. On a 3-phase, 4-wire, 480/277V service, a
question has arisen as to the required rating of the service
The calculated load is 780A. The fusible disconnecting means is rated
1,000A, based on the maximum fuse size that can be installed. What is
the minimum rating of the service disconnect permitted for this
- All of the above
Web site for the answer and explanation.
Cool Electronic Cabinets
Stop electronic control downtime due to heat, dirt and moisture. UL
Listed Cabinet Coolers from EXAIR produce 20 degree Fahrenheit air from
an ordinary supply of compressed air to cool electrical controls.
Thermostat control minimizes air usage. Maintains the NEMA 4, 4X
(stainless steel) and 12 rating of the enclosure. Web site offers
detailed information, downloadable drawings and PDF literature.
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presented by Walt Patterson, Author and Energy Specialist.
For more detailed information and to register online, visit http://www.electricshow.com.
It takes more than the UL Mark on a product to satisfy code
requirements. Before your next installation, use UL's Code Compliance
Database to identify the correlation between model codes and UL
Certified products, as well as find manufacturers of certified
Click here today to
find up-to-date UL Listed products at the UL Code Correlation Database.
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