ECN Forum Forums Code Related Discussion NEC & other Code issues Correct Load Calcs?

Comment on as little or much as you like.

Location: Commercial Retail Space

1) A/C
2-1/2 ton AC - 208y/120 1phase 23.3A MOCP-35
RLA Compressor 18.0A, FLA Condenser 0.8A, FLA Evaporator 2.5A, MCA 23.3A
((18.0*1.25%=22.5A+0.8A+2.5A)=25.8 * 208) = 5366.4 VA

1A) Is this the correct load calc for this configuration?

1B) If this were installed on AB, would the load be as follows?
PH-A 2683.2 VA
PH-B 2683.2 VA

1C) What size ckt. breaker would be acceptable if a 2-pole 35A is not available?

2) Automatic Clothes Washer
Rated at 120V/8A Automatic Washer - (8A*120V) = 960VA

2A) Should this be rated at 1500 VA, or can the name plate rating 960VA be used on the panel schedule/load calcs?

2B) In either case (#2A) should the VA be multiplied by 125% for LCL?

3) Automatic Clothes Dryer
Rated at 120V/12A Automatic Washer - (12A*120V)=1440VA

3A) Should this be rated at 1500 VA, or can the name plate rating 1440VA be used on the panel schedule/load calcs?

3B) In either case (#3A) should the VA be multiplied by 125% for LCL?

4) Emergency Lighting

4A) Are emergency lighting & exit signs considered part of the general lighting load?

4B) Is there a good VA number to use for emergency lights, exit lights, & combination emergency/exit lights?

5) 2'x4' Recessed Fluorescent Lights (4-tube)

5A) What is a good rule of thumb for calculating the ballast load?

Thanks,
Mario


[This message has been edited by Load-n-Code (edited 01-26-2005).]

I have been told that the correct answers to my questions are as follows:

1A) (18.0 + 0.8 + 2.5) = 21.3A
21.3A * 208V = 4430.4VA

1B) 4430.4VA / 2 = 2215.2VA PER PH LEG

2A) Use name plate rating 8A * 120V = 960VA

3A) Use name plate rating 12A * 120V = 1440VA

4A) Emergency lighting is considered part of the general lighting load.

5A) 225VA per 4 Lamp 2'x4' Fluorescent Fixture

Feel free to comment.

Thanks,
--Mario