Load Calcuation Commercial Help ?

[Part-Time]

Flower shop load calculation
120/240 VAC
2411 sqft building
8 general purpose receptacle 2 are outside doors 1 front & 1 back
1 exit sign
1 condenser 120v at 13.4 amps
1 AC unit 7.5 ton 240v at 40 amps
1 AC unit 3.5 ton 240v at 35 amps
1 chiller appliance 120v at 40 amps flower storage
14 fluorescent lights 120v at 34watts each
7 flush mounted lights 120v @ 60 watts each
5 track light assemblies 4ft. at 150 VA per 2 liner ft.
No show window lighting.
No water Heater
No sign ( is supplied by other service to building )
What size service should be used?
Currently has 150amp

 

[Buck Parrish]

I need the heatstrips kw ...

150 sounds okay

 

[cadpoint]

What if the heat strip is natural gas?

Can we assume that there's a common toliet thus no H2O heater? Depending on building type a bathroom and H2O might be required.

You sure the emergency light is not hung off of another circuit?

If you start a rehab would that E light be required to be a battery backup?

What's wrong with the existing panel or is this a proposed flower store ?

What's /where you calc's?

 

[Part-Time]

no heat strips, The exit sign has a battery backup in it.
and only cold water. it is a lease space in a shopping center.

 

[Volta]

Existing is too small by 20.

What were your numbers?

The space has no show windows?

 

[Volta]

And are you sure about the chiller spec's? High current for 120v.

 

[Part-Time]

6 Receptacle Load noncontiguous 220.14( I ) at 180 VA 1080VA
2411 General light load table 220.12 sqft X 3 VA 7223VA
10 "Track lighting in addition to General lighting 220.43 ( B )
continuous load at 125% 5 Four Foot track light assemblies." 1875VA
2 "Sign or Outline Lighting Outlets 220.14( F ), 600.5 ( A )
continuous load at 125% Two outside outlets " 3000VA
1 "All other continuous loads at 125%
One small appliance Chiller" 6000VA
HVAC at 1150VA
no show window

 

[david luchini]

HVAC at 1150VA

How did you arrive at 1150VA for HVAC? You list 11 tons of air conditioning for 75Amps at 240V.

Also, I think you'd have to apply 125% to your general lighting load of 7223VA.

 

[Part-Time]

The largest AC load or should they be combined the work separately .
the 7.5 is used mostly the other rarely.
Not sure about the general lighting being continuous? maybe
it is a commercial building.

 

[david luchini]

The largest AC load

I don't follow. You list one AC unit at 9600VA and another at 8400VA. That's 18,000VA. How is 1150VA the largest AC load?

 

[Volta]

6 Receptacle Load noncontiguous 220.14( I ) at 180 VA 1080VA
2411 General light load table 220.12 sqft X 3 VA 7223VA
10 "Track lighting in addition to General lighting 220.43 ( B )
continuous load at 125% 5 Four Foot track light assemblies." 1875VA
2 "Sign or Outline Lighting Outlets 220.14( F ), 600.5 ( A )
continuous load at 125% Two outside outlets " 3000VA
1 "All other continuous loads at 125%
One small appliance Chiller" 6000VA
HVAC at 1150VA
no show window

I think you are doing it right. In your OP there were 8 receptacles and no signs.
Lighting 2411 x 3 = 7233
Receptacles 8 x 180 = 1440
Track light = 1875
Signs = 1200 x 2 = 2400 x 1.25 = 3000
I included all cooling as continuous, so:
13.4 x 120 = 1608 x 1.25 = 2010
40 x 240 = 9600 x 1.25 = 12000
8400 x 240 = 8400 x 1.25 = 10500
Chiller 40 x 120 = 4800 x 1.25 = 6000.

I get 44,058 va or 184 amps.

 

[Volta]

How did you arrive at 1150VA for HVAC? You list 11 tons of air conditioning for 75Amps at 240V.

Also, I think you'd have to apply 125% to your general lighting load of 7223VA.

I often wonder about that, but never include it that way, as it is not a connected load. The actual lighting load (without track) is only about 10% of the required allowance. I would certainly add 25% to any actual connected fixture(s), and then use the larger.

 

[david luchini]

I often wonder about that, but never include it that way, as it is not a connected load. The actual lighting load (without track) is only about 10% of the required allowance. I would certainly add 25% to any actual connected fixture(s), and then use the larger.

I think by code, you'd have to add 125% to the 3VA/SF lighting load. 220.40 says the calculated load of a feeder shall not less than the sum of the loads on the branch circuits as determined by Part II, after any demand factors are applied...

Per T220.42, the lighting demand factor for the flower shop would be 100%. Per part II, specifically T220.12, the branch circuit lighting load for a "store" would be 3VA/sf.

Per 215.2, the feeder conductors shall have an ampacity not less than required to supply the load as calculated in Parts III, IV, and V of Article 220 (not the connected load.) And the feeder is required to an ampacity of not less than the non-continuous load plus 125% of the continuous load. I think the lighting load as calculated by Art 220 would be considered continuous.

I'd agree though, with the more efficient lighting systems out there, and with the energy codes that we have now, lighting design loads are way out of whack. I think the NEC should update the "Lighting Loads by Occupancy" in order to match the times.

 

[Part-Time]

largest AC load is 11500VA sorry i put 1150

 

[Part-Time]

largest AC load is 11500VA not 1150 sorry

 

[Volta]

I think by code, you'd have to add 125% to the 3VA/SF lighting load...

I think you are right.

That brings us up to 45866 va, or 191 amps.

 

[Part-Time]

Would any Demand Factors apply ?
like table 220.42 or 220.44

 

[Volta]

Would any Demand Factors apply ?
like table 220.42 or 220.44

Well, not such that it would help.

T220.42 applies, and your building would be "all others", so 100%.

T220.44 would apply for any general-purpose receptacle after the first 56 or so. But as you only have 6 or 8, that won't help, either.

I am still wondering about that chiller, 40 amps @ 120 volts. Is this the sum of multiple loads?

 

[augie47]

I may be off base, but as far as Art 220 is concerned, I don't see where we add any "continuous" multipliers. That said, I come up with roughly 141 amps but would doubt you could distribute the load evenly enough to get by with a 150 amp service.

 

[Volta]

I may be off base, but as far as Art 220 is concerned, I don't see where we add any "continuous" multipliers. That said, I come up with roughly 141 amps but would doubt you could distribute the load evenly enough to get by with a 150 amp service.

I agree that Art. 220 doesn't mention continuous, but starting with the branch circuits in Art. 210, the OCPD requires it, same with feeders in 215.

And I don't like to call non-code as supporting evidence, but it is all I can quickly find. Annex D, Example D3 changed my thinking about va/area being counted as continuous.

I don't see any actual Code sections that prove that, though.