side stepping arc fault breakers

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Re: side stepping arc fault breakers

On a more mature note, the practice, recognised (perhaps not directly enough for some) by 210, is that 15 amps is the minimum branch circuit size- unless we are talking about a dedicated circuit for a specific piece of equipment. And, by the way, "non standard" overcurrent protection device sizes are allowed to make it possible to give the maximum amount of protection to the equipment.
The minimum wire allowed is #14, which is consistant with a 15 amp circuit.
Receptacle patterns must comply with the circuit ratings- with one exception: you can have multiple 15 amp receptacles on a 20 amp circuit. Otherwise, as an example, a 30 amp circuit requires a 30 amp receptacle; it is wrong to use a 50 amp or 20 amp receptacle on a 30 amp circuit. Once again, our friends at UL allow a certain amount of flexibility when an appliance is evaluated, taking into consideration such things as start-up current and such. Remember 110 and 'following manufacturer instructions?'
The same "15 or 20amp" wording is also used with regards to GFI requirements. Surely you're not advocating 10 amp breakers for bathrooms....instead of GFI's?

Anything point where something connects that USES power is an outlet. A household smoke alarm, with it's horn and battery back-up, uses power, so it's location is an outlet. Besides NFPA 72 NOT being adopted into law, and outside of the NEC, the "Fire Alarm Code" is referring to remote sensing heads that connect to a central panel...in other words, a glorified switch.

So, like it or not, AFCI's are unavoidable. Since most of Europe protects the entire panel with the equivalent of an AFCI, I suggest that those having problems need to learn to be electricians. Likewise, a little formal education might eliminate some of this hair-splitting and false assuming.
Nor should we ignore reality. There are plenty of appliances that require well over 10 amps, that are likely to be found in the bedroom. Hair dryers and curling irons aren't limited to bathrooms, you know. Or space heaters. Or waterbeds (they also have heaters).

I'm actually surprised none of the geniuses out there suggested dodging the AFCI requirement by using "Malibu" lights and cigarette-lighter receptacles!
 
Re: side stepping arc fault breakers

The branch-circuit load for a counter-mounted cooking unit and not more than two wall-mounted ovens, all supplied from a SINGLE BRANCH CIRCUIT and located in the same room, shall be computed by adding the nameplate rating of the individual appliances and treating this total as equivalent to ONE RANGE.

Words such as single, individual and one are singular in nature and mean, ?one?.

A scenario I would like to pose is, can I wire a GFCI under a house off the 50 amp circuit feeding the furnace? Before you answer let?s take a look at a couple of articles mentioned in the code. 210.19 (A) (3) Exception No. 1: will let me tap a #12 awg conductor from a 50 amp circuit. 240.21 (B) (2) as long as I stay with-in 25 feet and the 12 is more than a third the rating of the 50 amp circuit.

In an industrial setting I could have a machine that has a dozen motors and bell with whistles on it. I would still run an individual circuit to this machine.
My heat pump is running right now, the compressor and fan is both working but it is still wired with a individual circuit.

With this I am going to roll up my bottom line and go fishing.
 
Re: side stepping arc fault breakers

Jw, Bless your heart, now you're grasping for straws.

When you go hunting (I know you went fishing) you must make sure you have the right bullets for the gun you are taking. In otherwords, you can't bring feeders into the debate, read the heading of 240.21(B) then go back to the ammo box.

Of course maybe we should listen to John, and for those who have it, use their formal education to discuss the receptacle ground orientation again. :D

OK, since I don't do any residential, I will leave this topic now, but durn if it ain't been a lot of fun. ;)


Roger
 
Re: side stepping arc fault breakers

Originally posted by cram:
210.3 clearly states that for other than individual branch circuits the rating "shall be 15,20,30,40,50".Again the only chance for a 10 amp 125 volt outlet of any kind is on an individual branch circuit.I fail to see the big mystery, it is a violation if that circuit with an ocpd rated at 10 amps was not an individual branch circuit.I do not dispute that you may have a piece of equipment in a bedroom that can be provided for by a 10 amp 125 volt branch circuit and ,that, that circuit/ outlet does not require afci protection but it must be recognized that, that receptacle/ outlet is not part of the required receptacle outlets and has to be an individual branch circuit. You cannot feed a bedroom with a 10 amp circuit nor can you feed multiple smokes or multiple anything for that matter and comply with 210.3 or 210.52. I can see no wording that suggests otherwise.
Taking into consideration all the replies,"and thank you all for them ,by the way".I would have to say this response is the one that brings it all to light for me and I agree with it.Thanks Cram!That makes 2 of us that feel this way.
 
Re: side stepping arc fault breakers

Regardless of the NEC I would ask what the customer paid for?

I imagine the customer expects 15 or 20 amp circuits supplying their receptacles.
 
Re: side stepping arc fault breakers

Roger, when wiring more than cooking appliance we are allowed to tap(key word) off an individual branch circuit you are not allowed to put a receptacle on tap conductors. Taps must be spliced. Thanks to all and to all a good night
 
Re: side stepping arc fault breakers

Sorry guys forgot something.... the exception(210.19) that allows the tap(s) allows it for 50 amp circuits explicitly.If you have 50+ amps worth of cooking appliance/household ranges looks like your running more circuits.Unless it is one piece of equipment then I suppose an individual branch could be run,210.23(D) would also support this notion.The 2002 handbook has a comment under 210.23 (d) it refers us back to the exception under 210.3 "non lighting outlet loads in industrial establishments".It seems to me and I'll admit it I'm no one,,, that 50amps is it as far as 210 is concerned,outside of industrial establishments. Good night everyone.
 
Re: side stepping arc fault breakers

renosteinke,
it is wrong to use a 50 amp or 20 amp receptacle on a 30 amp circuit.
210.21(B)(1) clearly permits a single 50 amp receptacle on a 30 amp circuit.
Since most of Europe protects the entire panel with the equivalent of an AFCI,
They use RCDs which are in no way equivalent to an AFCI. They are ground fault protectors with a 30 mA trip.
Remember 110 and 'following manufacturer instructions?
110.3(B) does not say "manufacturer instructions", it says "instructions included in the listing or labeling". They are not the same.
Don
 
Re: side stepping arc fault breakers

Could you please explain your statement that:

?210.21(B)(1) clearly permits a single 50 amp receptacle on a 30 amp circuit.?

The way I read this is:

?(1) Single Receptacle on an Individual Branch Circuit. A single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.

I can see where that I am not allowed to use a 20 amp receptacle on a 30 amp circuit but fail to see where I can use a 50 amp receptacle on a 30 amp circuit.
Are you saying that because 210.21 (B) (1) don?t state that I can?t use a higher rated receptacle that it will be alright?
That is not very clear to me as I also read 406.7. Should I install a 50 amp receptacle on a 30 amp circuit would not the ?intent? be that this be a 30 amp rated receptacle that I could now plug in a 50 amp rated piece of equipment?

I assigned this thread to a class, and we are discussing the use of a 10 amp OCPD in residential branch circuits. This morning my mail box is full of questions about your post.

Would you please elaborate a little as there seems to be a lot of confusion about your statement? All but two of the students have referred to ?Chief Moderator? and believe that this title carries weight as being the correct interpretation.
 
Re: side stepping arc fault breakers

Originally posted by jwelectric:
Could you please explain your statement that:

?210.21(B)(1) clearly permits a single 50 amp receptacle on a 30 amp circuit.?
210.21(B)(1) Single Receptacle on an Individual Branch Circuit. A single receptacle installed on an individual branch circuit shall have an ampere rating not less than that of the branch circuit.

Exception No. 1: A receptacle installed in accordance with 430.81(C).

Exception No. 2: A receptacle installed exclusively for the use of a cord-and-plug-connected arc welder shall be permitted to have an ampere rating not less than the minimum branch-circuit conductor ampacity determined by 630.11(A) for arc welders.
IMO the correct way to put it would be that 210.21(B)(1) does not prohibit a single receptacle to installed on an individual branch circuit of lower rating.

What is not prohibited is allowed. :cool:

Bob
 
Re: side stepping arc fault breakers

Bob
Please address 406.7, this seems to prohibit the use of the 50 amp rec. on a 30 amp circuit.

?Receptacles, cord connectors, and attachment plugs shall be constructed so that receptacle or cord connectors do not accept an attachment plug with a different voltage or current rating from that for which the device is intended.?

When the 50 amp rec. is wired to the 30 amp circuit the intent is for the rec. to be rated 30 amp, yet a 50 amp cord could be used

In my opinion, and as I have heard said by many, just because something is not clearly prohibited is not a license to require.
 
Re: side stepping arc fault breakers

Originally posted by jwelectric:
Bob
Please address 406.7, this seems to prohibit the use of the 50 amp rec. on a 30 amp circuit.
406.7 Noninterchangeability.
Receptacles, cord connectors, and attachment plugs shall be constructed so that receptacle or cord connectors do not accept an attachment plug with a different voltage or current rating from that for which the device is intended. However, a 20-ampere T-slot receptacle or cord connector shall be permitted to accept a 15-ampere attachment plug of the same voltage rating. Non?grounding-type receptacles and connectors shall not accept grounding-type attachment plugs.
There is nothing in 406.7 that is relevant to what we are discussing.

Lets say I am wiring a piece of equipment that has a maximum overcurrent protection of 65 amps.

I choose to wire this with disconnect switch, which will have to be rated 100 amps.

Must I feed this disconnect switch with 100 amp OCP and conductors or conductors based on the load served?

Now the customer says the equipment needs to move each night for cleaning so I remove the disconnect and install a 100 amp rated receptacle and plug.

Would you say I must supply that 100 amp receptacle with 100 amp OCP?

Now that is above the allowable OCP for the equipment.

Even more common is the use of a 40 amp breaker with a 50 amp range receptacle.

Bob
 
Re: side stepping arc fault breakers

jw,
Look at the words in the section that I cited. The single receptacle must have a rating not less than that of the branch circuit. A receptacle with a rating of 50 amps installed on a 15 amp branch meets this requirement.
Don
 
Re: side stepping arc fault breakers

don, a 50 amp receptacle on a 15 amp individual branch circuit, are you kidding. do know the damage that could be done to health and safety if this were allowed. Give me a break there is more than one article at play here,or are you just pulling our legs.
 
Re: side stepping arc fault breakers

Marc, in your own words, tell us what would be so dangerous about it.

The 15 amp OCD limits the circuit to 15 amps period. You can plug a range into the 50 amp receptacle and it would simply open the OCPD at the protection level.

Now if we had a crazed Chef using this range, you might have a point. :D

Roger

[ January 30, 2005, 03:14 PM: Message edited by: roger ]
 
Re: side stepping arc fault breakers

Originally posted by roger:
Marc, in your own words, tell us what would be so dangerous about it.
Or cite a code section that prohibits a 50 amp receptacle fed by a 15 amp breaker. :p
 
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