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Calculations Detail

The document details electrical load calculations for various lighting, equipment, and appliances, providing power ratings, connected loads, demand factors, and total demand loads. It includes specific calculations for lighting loads, receptacles, HVAC units, and other appliances, resulting in a total connected load of 94.12 KVA and a demand load of 88.2 KVA. Additionally, it outlines ampere ratings and notes relevant NEC codes for continuous load factors and HVAC motor ratings.

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bradkm87
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33 views1 page

Calculations Detail

The document details electrical load calculations for various lighting, equipment, and appliances, providing power ratings, connected loads, demand factors, and total demand loads. It includes specific calculations for lighting loads, receptacles, HVAC units, and other appliances, resulting in a total connected load of 94.12 KVA and a demand load of 88.2 KVA. Additionally, it outlines ampere ratings and notes relevant NEC codes for continuous load factors and HVAC motor ratings.

Uploaded by

bradkm87
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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Electrical load Calculations

Power Rating Connected Demand Demand


Sr. No Description Qty.
(VA) Load (VA) Factor Load (VA)

Lighting Load
1 DIMMABLE HIGH BAY (277 V, 100 W) 100 18 1,800 1.25 2,250
2 8″ LED D0WNLIGHT (277 V, 10 W) 10 29 290 1.25 363
3 2×4 LED (277 V, 40 W) 40 15 600 1.25 750
4 PENDANT LIGHTS (120 V, 6 W) 6 13 78 1.25 98
5 TRACK LIGHTS (120 V, 6 W) 6 14 84 1.25 105
6 SUBTOTAL – – 2,852 – 3,565
Equipment and Appliances Load
7 GENERAL DUPLEX RECEP. 120V 180 140 25200 – –
8 GFI DUPLEX RECEP. 120V 180 15 2700 – –
9 DUPLEX RECEP. 220V 2000 2 4000 – –
NEC 220.14(H)/(I) allows demand factors on general receptacles.
10000 at 100% = 10000
21900 at 50% = 10950

10 ALL RECEPTACLES (Total 120 V + 240 V) – 157 31900 0.66 20950


11 A/C #1 (8.5 T) – 1 12,750 1 12,750
12 A/C #2 (5.5 T) – 1 8,250 1 8,250
13 A/C #3 (8.5 T) – 1 12,750 1 12,750
14 A/C #4 (5.5 T) – 1 8,250 1 8,250
15 ADD 25% LARGEST HVAC MOTOR – – 3,188 1 3,188
16 REFREGIRATOR 700 1 700 1 700
17 MICROWAVE OVEN 1,200 1 1,200 1 1,200
18 EXHAUST FANS (50 W EACH) 50 5 250 1 250
19 HAND DRYERS (1500 W each) 1,500 5 7,500 1 7,500
20 EXIT & EMERGENCY SIGNS (5 W EACH) 5 4 20 1 20
21 OFFICE PC/ PRINTERS (200 W/office) 200 16 3,200 1 3,200
22 Water Heater (4500 W ELEMENT) – 1 4,500 1.25 5,625
TOTAL CONNECTED AND DEMAND LOAD IN (KVA) 94.12 88.2
AMPERE RATING 114 106
AMPERE RATING WITH 25% SPARE 143 133

AMPERE RATING: 88200VA


"I3Ø = = 106𝐴
("√3 × 480)

AMPERE RATING WITH 25% SPARE: 106A×1.25 = 132.5A

NOTES:
1.) Lighting items each are shown with a 1.25 continuous factor (NEC 220.42).
2.) HVAC is shown individually at 100%, plus one line adding 25% of the largest unit’s motor (NEC 220.50, 430.24).
3.) Water Heater is at 125% of element rating (NEC 422.13).

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