replying to Irreverent Maximus , Let's get it right! wrote:
nospam wrote:

"bud--" wrote in message
b.com...
I guess this device should be unlisted:
http://www.cesco.com/b2c/product/471640
It appears that it accepts both 15 and 20 amp plugs. I wonder why that
is?
I have shopped at many stores and have yet to see an appliance with a true
twenty amp plug. I am so confused...



Articles 100 thru 400 of NEC are mandatory. Only after Article 400 can
you deviate from for specific applications.

A "Listed" device is only "Protected" when applied within it's listing
requirements and labeling. If you don't provide branch circuit protection
compatible with the "Listed" device listing requirements and labeling, it
not "Protected" according to NEC. Subsequently, if you provide 20-ampere
branch circuit protection to circuit intended to interface with "Listed"
devices, the "Listed" devices will not be "Protected".

A single, dedicated NEMA 5-15 receptacle is allowed to be interfaced with
a 20-ampere circuit breaker ... but not multiple 15 ampere receptacles.
In addition, the steady state current draw on a NEMA 5-15 receptacle
should be limited to about 13-amperes (allowing for a 2-ampere margin)
according to NEC. A 20-ampere circuit breaker would allow for a 7-ampere
margin which would expose resistive components (such as power cords) to
over 75% more real power than what they are listed at. The power cord,
plug, etc. will burn up under such circumstances, and a fused "Listed"
device will not protect the power cord of that "Listed" device.

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