Correct Load Calcs?

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load_n_code

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Comment on as little or much as you like. :D

Locattion: Commercial Retail Space

1) A/C
1 - 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?

Thanks,
Mario

[ January 26, 2005, 06:20 AM: Message edited by: load_n_code ]
 
Re: Correct Load Calcs?

Based on what you provided:

1A & 1B) The actual load would be the comp. cond. and fan which equals 21.3 amps @ 208v = 4430.4 VA or 2215 va on phases A & B.

1C) The MOCP means Maximum Overcurrent Protection. Therefore if a 35 amp breaker is not available then you use a 30 amp (and hope that it does not trip on inrush) or install a 40 amp breaker and use a fused switch at the unit with 35 amp fuses.

2A) Name plate data is the correct method for non-dwelling calculations.

3A) Name plate data is the correct method for non-dwelling calculations.

4A) Emergency & Exit lighting should be considered general lighting. It is lighting and it will operate continuous.
 
Re: Correct Load Calcs?

Jerry,

Thank you.

Is 225VA enough load to cover most 2'x4' recessed 4 lamp fluorescent light fixtures?

--Mario
 
Re: Correct Load Calcs?

225 VA sounds like too much load to me. Most fixtures of reasonable quality have electronic ballasts now a days. Ballast manufacturers would tell you that 114 VA for (4) 32 watt, 48" long lamps would be much more accurate. If the ballast were a magnetic type, energy efficient then the load would be 70 VA for (2) 32 watt lamps or a total of 140 VA.
 
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