It has my contention as an inspector, that the maximum wattage of the recessed luminaries be added to the wattage of calculating service sizes. I ordinarily ask contractors to consider the circuits that need to be added to cover amps added to accommodate this is above the minimum 3VA per square foot. 110.3 210.11 are my ordinary references with this grey area. I am having a discussion with my supervisor about this and having some resistance. I have had a bit of mental block after concussion and literally reading NEC 02,and 08 all over.
I need a bit of help with more code references besides what I referenced above or tell me I am wrong. Thanks all!
I am with shortcircuit, I understood the 3va per sqft was for lighting and general purpose receptacle loads. Also with the LEDs for can lights getting cheaper I see more and more of those going in, this takes a maximum 65 watt fixture and makes it a 3 or 5 watt fixture. So the way I see it adding the extra 3 VA would just be insurance that the service has the capacity to carry any future loads that might be added, and I see nothing wrong with that.
Life is tough, Life is tougher when you are stupid
I do agree with the energy codes being able to lower wattage at the time of construction, however, when construction is done, if a fixture is not fitted with a non reversing adaptor that would only allow for a particular bulb; there is no guarantee that the bulbs won't end up being the maximum allowed for the recessed luminaire. Also, I see where CFL bulbs might be non-linear as well as any lighting location being continuous. This is not usually an issue when only 4 or 5 recessed luminaries are installed but when 12-100 recessed luminaries get installed and are not accounted for. Thank you again, in advance for all input.
Patrick, you should be looking at article 220 for your load calcs and look at the examples in annex D in the back to see how all of that works.
The 3va from table 220.12 is all of the general lighting load for the occupancies it applies to but the footnotes at the bottom have additional adjustments for occupancies like offices that will end up being 4.5va when you apply them 220.14(k). 220.14(J) points out the required outlets in a dwelling that do not trigger any additional load allowance (bathrooms, garages, basements and the required lighting outlets). You still add in the laundry and small appliance circuits in the kitchen at 1500va per circuit 220.52(A)(4500va total).
Here in Chicago the logic behind allowances for individual fixtures (such as downlights) is that no matter what wattage lamps are installed initially someone will decide that it's too dark and go to the DIY store, buy a bigger lamp, stand on a chair and stick it in the fixture.
As such, the requirement here is to allow for the maximum that CAN be installed instead of what is called for on the plans.
However, the incoming is sized per Article 220 regardless of how it's broken down once it comes into the building.