Optional Demand Calculation

[dre120]

A single family dwelling is supplied with a 120/240 volt, 1?,3 wire service. This dwelling has 1,500 sq.ft, a total appliance load of 22,000 VA, 8,000 VA of air conditioning, and 15,000 VA of electrical heating which is controlled by five thermostats.

this is how I am figuring it out.

3va x 1500 sqft 4500
2 x 1500 small appliance 3000
1 x 1500 laundry 1500
1 x 1500 bathroom 1500
22,000 va Total Appliance 22,000
32,500

First 10,000va 100% 10,000
Remainder @ 40% 9,000
Heat is larger 15,000 x 65%(220.82 C(4)) 9,750
Answer key says 26,400va but I get 25000 va?

 

[wirebender]

A single family dwelling is supplied with a 120/240 volt, 1?,3 wire service. This dwelling has 1,500 sq.ft, a total appliance load of 22,000 VA, 8,000 VA of air conditioning, and 15,000 VA of electrical heating which is controlled by five thermostats.

this is how I am figuring it out.

3va x 1500 sqft 4500
2 x 1500 small appliance 3000
1 x 1500 laundry 1500
1 x 1500 bathroom 1500
22,000 va Total Appliance 22,000
32,500

First 10,000va 100% 10,000
Remainder @ 40% 9,000
Heat is larger 15,000 x 65%(220.82 C(4)) 9,750
Answer key says 26,400va but I get 25000 va?

3va x 1500 sqft 4,500
2 x 1500 small appliance 3,000
1 x 1500 laundry 1,500
1 x 1500 bathroom (not included 220.14(J)(1)
22,000 va Total Appliance 22,000
31,000


First 10,000va 100% 10,000
Remainder @ 40% (21,000X.4) 8,400
A/C 8.000
26,400

The A/C load is used because the heat would figured by 220.82(C)(5).
15,000X.4 = 6,000

Edit to add code section for bathroom circuit.