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Anonymous Poster

# Room Index in Lux Calculation

07/06/2010 11:27 AM

1)why we calculate the room index in lux calculation ?And in which unit it can be express after calculation?

2)How much VA I should assum as per NEC code for single and Duplex outlet

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Power-User

Join Date: Feb 2010
Posts: 189
#1

### Re: Room Index in Lux Calculation

07/06/2010 12:59 PM

Here is all detail about index in lux. Please follow the steps and pay attention to step-2.

http://www.ndlight.com.au/lighting_calculations.htm

According to Artical 220.14(I):
Receptacle outlets shall be calculated at not less thant 180 Va for each single or multiple receptacle on one yoke. A duplex receptacle is considered to be two receptacles on a common yoke. so the calculated load for a duplex receptacle is 180 VA. Where there are four or more receptacles such as a quad receptaclee, the calculation shall be not less than 90 VA per receptacles. For a quad receptacle the calculated load would be 4 times 90 VA or 360 VA.

Guru

Join Date: Feb 2009
Location: Houston, USA
Posts: 973
#2

### Re: Room Index in Lux Calculation

07/06/2010 6:59 PM

Just to clarify one thing - the Article 220.14(I) in the above comment refers to NEC. Somehow, the commentator didn't mention it.

- MS

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Power-User

Join Date: Feb 2010
Posts: 189
#3

### Re: Room Index in Lux Calculation

07/07/2010 11:30 AM

Good point.

Anonymous Poster
#4

### panel classification -frame-1,frame-2,frrame3

07/07/2010 12:15 PM

1)where i can find the classification of panels like frame-1,frame-2,frrame3 ? on which bases this classification has done?

frame-1:single panel encloser with main braker (MCCB)and other branch breaker(MCB)

usually this encloser are used for load centres

frame-2:this is multi encloser in which first encloser consist main air circuit breaker with common bus bar and in second encloser with same common bus bar with branch breakers(MCCB) usually this encloser are used for MDB

frrame3: drawn out type encloser this type of encloser are used sewage treatment plants and industrial purpose

Off Topic (Score 5)