On Wednesday, December 18, 2013 1:44:02 PM UTC-5, Let's get it right! wrote:
replying to Let's get it right!, Let's get it right! wrote:

Let's get it right! wrote:



b.com...

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.





Your missing the point. If branch circuit protection in a home is

20-amperes or greater, and use NEMA 5-15 and/or NEMA 5-20 receptacles, the

"Listed" appliances are not protected, and because they cannot be applied

in accordance with their listing and labeling requirements.



On the other hand, if branch circuit protection in a home is 15-amperes,

and use NEMA 5-15 and/or NEMA 5-20 receptacles, "Listed" appliances will

be considered "Protected" according to NEC because they can be applied in

accordance with their listing and labeling requirements.



This argument is a lot like which came first .... the chicken (branch

circuit protection) ... and the egg ("Listed" appliances). The argument

boils down to "Do you protect Listed appliances" or not? If not, get use

to having latent fire/shock hazards ... and overloaded extension cord

fires every X-mas!



If you can't have multiple 15 amp receptacles on a 20 amp circuit,
because someone could plug one of the everyday common devices like
lamps, TV, coffee pot, etc into one,
why is it that they are being installed and passed by electrical inspectors
all around the country every day? Sound like the electrical inspectors
who understand the code disagree with your opinion.

Your contention is that the circuit breaker has to be capable of protecting
the load and it's wiring? Why then is this safety issue unique to 20 amp circuits?
As has been pointed out, most lights have 18 gauge wire cords and they
are connected to 15 amp receptacles, 15 amp breakers. The current carrying
capability of that wire is less than the breaker rating. How is that
different? When it was brought up, you just ignored it.