220.14(d)

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mdshunk

mdshunk

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220.14(D) requires a branch circuit to be calculated with the maximum value of the lamps that can be permissably installed for each fixture.

The UL Marking Guide does require that each recessed fixture have the maximum lamp labeled in the fixture. The UL Marking Guide also requires each trim to have the maximum lamp that may be installed noted on the trim, or the fixture to have a table inside that indicates maximum lamp sizes with respect to the possible trims.



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72. RECESSED LUMINAIRE LAMP REPLACEMENT MARKINGS ​
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— Recessed luminaire housing or rough-in section may employ a marking system where the lamp replacement marking is dependent upon the trim or finishing section used. A luminaire housing is marked “USE ONLY WITH [Manufacturer] [Catalog Number] TRIMS”. A rough-in section is marked “ROUGH-IN SECTION FOR USE WITH FINISHING SECTION ______”. The blanks are filled in with manufacturer and trim or finishing section number as appropriate. All recessed luminaries are marked for lamp replacement “CAUTION – RISK OF FIRE. MAX ___ WATTS ___ TYPE”. A recessed luminaire that requires a different lamp wattage or type for an alternate trim or finishing section is marked “CAUTION – RISK OF FIRE” and a table specifying the trim or finishing section and the maximum lamp wattage and type permitted for use with it. Alternately the lamp replacement information can be included on the trim or finishing section. The lamp replacement markings can be concealed providing the trim or finishing section must be removed for relamping or it is additionally marked where visible during relamping “SEE OTHER (BACK) SIDE FOR RELAMPING INFORMATION.”​




Question is... when sizing lighting circuits in accordance with 220.14(D), are we to consider the maximum lamp possible with any possible trim, or the maximum lamp possible with the present (or specified) trim? Is the rough-in section by itself the "luminaire"? Or, is the combination of the rough-in section and the trim the "luminaire"? Reason I question this, is because another note in the UL Marking Guide seems to indicate that the aggregate fixture might be both pieces, just installed in two parts:

[FONT=Arial,Bold]63. ROUGH-IN AND FINISHING SECTIONS [/FONT]— Some recessed luminaires are intended to be installedin two parts. The Rough-In Section usually consists of the plaster frame and junction box, and is marked “ROUGH-IN SECTION FOR USE WITH FINISHING SECTION __________”, or ROUGH-IN SECTION ____FOR CONVERTIBLE RECESSED LUMINAIRE.” The blanks are replaced by catalog numbers or series designations. The Finishing Section usually consists of the recessed housing and trim; it is marked with the manufacturer’s identification and catalogue number. A convertible recessed luminaire trim/finishing section is also marked “FINISHING-SECTION FOR USE WITH ROUGH-IN SECTION __________.” The blanks are replaced by the catalog number or series designations. If a light diffuser is not provided, an additional marking on the finishing section indicates that the luminaire must not be used with a light diffuser.
 
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A luminaire housing is marked ?USE ONLY WITH [Manufacturer] [Catalog Number] TRIMS?. A rough-in section is marked ?ROUGH-IN SECTION FOR USE WITH FINISHING SECTION ______?.
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I would say based on these markings, a can is not to be used without a trim, so the max wattage based on the trim selected should be used. But this is solely based on my opinion of the words you've posted from the UL White Book.
 
IMO, it should be based on the max lamp permitted in the rough-in can. (I assume you are talking recess?) The trim can always be changed in the future. It is also possible they owner could change their minds before the trimout.
 
stickboy1375 said:
You have to use the MAXIMUM wattage the fixture could use...
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Yep, but is the fixture just the rough-in section, or is that only 1/2 the fixture? Is the fixture the combination of the rough-in section and the trim?
 
Is the trim going to tell you to install a larger size bulb then the housing? I think not, you have to use the can... anyone can easily change trims later on... its not hard to tell what would happen if 20 recess cans are installed on a 15amp circuit and the largest bulb possible is 150w, but we install 75w bulbs at the time of trim install...then the owner changes her mind... (notice I used "her") :)
 
stickboy1375 said:
You have to use the MAXIMUM wattage the fixture could use...
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IMO it can be based on the installed trim.

The section requires the calculation to be based on the maximum VA of equipment and lamps that the luminaire is rated for.

A rough in kit is not a luminaire, it is only part of a luminaire.

The luminaire is the trim and the rough combined.

Check the definition of luminaire in Article 100. :)
 
Electrical Contractor just did an article on this code article. and they figured it the same way as I do... I see your point with the trim installed. Some jobs I do just don't have a trim selected so I always use the max wattage bulb possible...
 
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stickboy1375 said:
you have to use the can... anyone can easily change trims later on...
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Of course someone can change the trim, which is why I post my query. 220.14(D) talks about the luminaire, and I'm not convinced that the luminaire is the rough-in section only. If I wanted to be completely conservative (translation, not know for sure and make a safe guess), then I'd say it's the can only. There come times where that route may not be economical, particularly with newer homes and businesses favoring a great many recessed fixtures.

Did you read the text from the UL Marking Guide For Luminaires? It seems to indicate that the luminaire is the total of the can and the trim, and that the trim modifies (in many cases) the max wattage of the can (making it less).
 
stickboy1375 said:
Electrical Contractor just did an article on this code article. and they figured it the same way as I do... I see your point with the trim installed, some jobs don't have a trim selected at rough anyhow...
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Your way is better design if you think changes may be made.

However if you look at the Article 100 definition of Luminaire there is no doubt that the NEC only requires the calculation based on the max lamp for the installed trim.

The same rough in kit may take a 250 watt par or a 13 watt CFL, I sure would want to go with the installed trim. ;)
 
iwire said:
Check the definition of luminaire in Article 100. :)
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No wonder that had a smiley face after it. That pretty much clears it up. Perhaps I was overcomplicating the matter with the UL book crap. Truthfully, I never thought that the definition of a luminaire would go into that much detail, so I never checked. Mystery solved, in my mind. You can base the branch circuit calculation for recessed lights based on the max wattage of the can as modified by the trim that will be used.
 
stickboy1375 said:
I agree, it does make life tough....
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It does not make it tough as I go ahead and base the circuit on the installed trim.

You have any idea how many single lamp 13 Watt CFL fixtures you can supply at 277 volt? :cool:
 
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