Use of receptacles

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George Stolz

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Windsor, CO NEC: 2023
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Hospital Master Electrician
Hypothetical:

There is a 20A cord-and-plug-connected load bolted to the floor. There is a 20A single receptacle on an individual (12-2 NM 20A) branch circuit supplying it. It runs for no more than 30 minutes.

Is this legal/illegal? Code reference?
 
Load that bad boy up to 20 amps for 2 hours 59 minutes 59 seconds shut it off for a split second and run it again.

Can not really give a code reference that allows it but I can say Table 210.21(B)(2) does not apply.
 
So why does CMP-2 have concern for overloaded receptacles on circuits of two receptacles or more, and not individual branch circuits?

I'm trying to write the most correct, best thought-out response to an ROP rejection I can think of, and find myself wandering in circles. :(


2-174 Log #3133 NEC-P02 Final Action: Reject

(210.21(B)(2))


Submitter:​
Eric Stromberg, Stromberg Engineering, Inc.​


Recommendation:​
Delete Section 210.21B(2) and associated table.​


Substantiation:​
As written, this section is unenforceable, because it applies to all cord-and-plug devices; not just those fastened in place at the time of installation. According to this section, every time I use my circular saw, I violate the Code . If this section is for the purpose of after-the-fact application, as would be the case for a fire investigation, it seems that 210.23 could be cited instead.​


Panel Meeting Action: Reject​

Panel Statement: The panel continues to maintain that the cord and plug connected load must not exceed the maximum load specified in Table 210.21(B)(2).​

Number Eligible to Vote: 12​

Ballot Results: Affirmative: 12
____________________________________________________________
2-175 Log #1089 NEC-P02 Final Action: Reject
(210.21(B)(2) and Table 210.2(B)(2))

Submitter:​
Daniel Leaf, Seneca, SC​


Recommendation:​
Delete.​


Substantiation:​
This section has nothing to do with safety and is virtually unenforceable when the load is portable or transient, or connected after inspection. In Proposal 1-64 of the 1994 ROP, the panel rejected the proposal to define an individual circuit as one supplying a single receptacle inferring that a circuit supplying a duplex receptacle with only one equipment plugged in is an individual circuit. If this is the intent, the receptacle can supply any load for which it is rated. Receptacles are evaluated for their full ratings. There are listed appliances with rated current over 12 amperes with factory equipped 15 ampere plugs with no instructions to utilize an individual circuit, such as hair dryers, central vacuums, pressure water sprayers, etc. implying the testing agency found no hazard with a multiple receptacle circuit.​


Panel Meeting Action: Reject​

Panel Statement: See the panel action and statement on Proposal 2-174.​

Number Eligible to Vote: 12​

Ballot Results: Affirmative: 12
____________________________________________________________
2-176 Log #1394 NEC-P02 Final Action: Reject
(210.21(B)(2), Table 210.21(B)(2))

Submitter:​
George Stolz, II, Pierce, CO​


Recommendation:​
Delete the text and chart.​


Substantiation:​
Item (1) and (3) in 210.21(B) address receptacle ratings, whereas Item (2) addresses connected loads, which are more appropriately and already addressed in 210.23(A)(1). 210.21(B)(2) is redundant. The following sections reference this section and would need to be amended to either reference 210.21 in general, or 210.23: 210.21, the FPN to 406.2(B), 406.3(A), 520.9, 530.21(A). Index “Heavy Duty

Lampholders”, and “Maximum Connected Load to Receptacles”. No coordinating proposal will be submitted to request these amendments.​

Panel Meeting Action: Reject​

Panel Statement: See the panel action and statement on Proposal 2-174.​

Number Eligible to Vote: 12​

Ballot Results: Affirmative: 12​

As I've been circling this, I've decided I did not have as good a bead on this section as I originally thought.
 
georgestolz said:
So why does CMP-2 have concern for overloaded receptacles on circuits of two receptacles or more, and not individual branch circuits?

I'm trying to write the most correct, best thought-out response to an ROP rejection I can think of, and find myself wandering in circles. :(




As I've been circling this, I've decided I did not have as good a bead on this section as I originally thought.

George, try just going in a straight line. When you have it figured out, let us know so we can quit going in circles. I am tempted to attend one of the CMP meetings just to see what they have to say about things. I usually can understand things if they are well enough explained.
 
iwire said:
Load that bad boy up to 20 amps for 2 hours 59 minutes 59 seconds shut it off for a split second and run it again.

Can not really give a code reference that allows it but I can say Table 210.21(B)(2) does not apply.

Doesn't AC current "shut off" for a split second 120 times a second ?
Maybe this whole continuous load stuff is irrelevant anyway !

Or maybe posting on this message board is turning my brain to mush

David
 
dlhoule said:
George, try just going in a straight line. When you have it figured out, let us know so we can quit going in circles. I am tempted to attend one of the CMP meetings just to see what they have to say about things. I usually can understand things if they are well enough explained.

Are the meeting times posted somewhere ?
 
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