Here are a few links that may answer your question. Also there is a calculator on one of the links. :)

http://www.ehow.com/how_7467696_calculate-lighting-load.html

http://ecmweb.com/mag/electric_commercial_load_calculations/

http://www.electricalknowledge.com/SFDLoadCalc.asp

Hope it helps. :) J.

# General lighting load calculations?

I'm trying to figure out what the general lighting load formula is...and I'm getting so confused.

Floor area of home: 1800 sq ft

11kw range, and a 6kw, 240 V dryer

So what would be my general lighting load for the home?

Floor area of home: 1800 sq ft

11kw range, and a 6kw, 240 V dryer

So what would be my general lighting load for the home?

## 6 Answers

- 00
- This Site Might Help You.

RE:

general lighting load calculations?

I'm trying to figure out what the general lighting load formula is...and I'm getting so confused.

Floor area of home: 1800 sq ft

11kw range, and a 6kw, 240 V dryer

So what would be my general lighting load for the home?00 - The short answer is yes, it is against the electrical code for a very simple reason. the code requires lighting circuits to be separate from receptacle circuits so if you blow the lighting circuit you can plug in a lamp and have light to fix it. If you blow the receptacle circuit you still have light to fix it. While it is not necessarily a code requirement, many of the better home builders place the refrigerator, the microwave, and the dishwasher on separate circuits. In addition there should be two other circuits so you can toast bagels and make coffee at the same time.00
- For the best answers, search on this site https://shorturl.im/avTi5

It all depends on when the house was built as to the code. The code changes every three years; this year is one of them. The technical answer is that it probably was not out of code at the time but would now be. Don't think that you need to run out and change it right away because unless you change the circuit it is still compliant with the code used at the time(we hope). Now if someone has just recently done this it would be out of the normal but not necessarily out of code if it is not hardwired and/or load calculations were made to ensure that the code was met. I am speaking on a national level of code (using the current NEC2005) and the only way to for sure know would be to give your local building inspector a call. Microwaves are a tricky appliance because some draw less then 5 amps while some draw over 15amps.00 - Lighting Load Calculator00
- Standard Calculation (based on supplied information):

3 VA/sqft x 1800 sqft = 5400 VA

11 kW range: apply Table 220.55 => 8000 VA

6 kW dryer: 100% of nameplate rating for dryers over 5 kW => 6000 VA

Other required circuits:

2 x 1500 VA for small appliance circuits => 3000 VA

1500 VA for laundry circuit => 1500 VA

Total = 23900 VA

First 3000 VA @ 100% = 3000 VA

Remainder up to 120000 VA (calculated at 20900 VA) @ 35% = 7315 VA

Total demand = 10315 VA

Total amperage on a 240 volt system = 42.98 amps

Optional Calculation:

3 VA/sqft x 1800 sqft = 5400 VA

Nameplate rating of major appliances:

Range = 11000 VA

Dryer = 6000 VA

Other required circuits:

2 x 1500 VA for small appliance circuits => 3000 VA

1500 VA for laundry circuit => 1500 VA

Total = 26900 VA

First 10000 VA @ 100% = 10000 VA

Remainder (calculated at 16900) @ 40% = 6760 VA

Total demand = 16760 VA

Total amperage on a 240 volt system = 69.83 amps

Since standard calculation yields smaller amperage requirements, standard calculation is used for feeder demand.

Other considerations:

Are there any other fixed appliances such as over the range microwave, dishwasher, garbage disposal, water heater, or sump pump?

Is there any electric heating or air-conditioning?10

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