bencelest
Member
- Location
- California
I made another calculation which I based it on a book I bought at Home Depot "Stanley Complete Wiring" since I have not receive the 2005 NEC book I ordered here. Please make a comment.
I called the AC guy who will install the duct but will not install the unit. He gave me the cna of the 2 units. The HO will make buyer install them in the future.
House elect calculation
1. Multiply square footage x 3 watts
2. Add 1500 watts for each kitchen small appliances circuit and laundry room ckts
3. Add the wattage for all appliances that are on their own ckts i.e. electric dryer, water heater, range , AC (Check the nameplates and remember that watts =volts x amps)
4. Add the 3 numbers up
Figure the first 10,000 watts at 100% and the remaining watts at 40 %.
5. Add the wattage of either the heating unit or the central AC whichever is greater
6. Divide this figure by 230.
1. 4,200 sq ftx 3 12600 watts
2. 2 appliance load + laundry
3 x 1500 4500 watts
3. Water heater 5500 watts
Dishwashers 1200 watts
Dryer 5500 watts
Garb disposal 1200 watts
Range 8000 watts
Wall mounted oven 3000 watts?
Hot tub 8000 watts?
----------------
32400 watts
-----------------------
49500 watts
4. First 10,000 at 100% 10000 watts
Remaining 39500 at 40% 15800watts
---------------------
Subtotal 25800 watts
5. Central air 13892 watts
4 ton 26.2a x 230=6026 watts
5 ton 34.2 x 230 = 7866 watts
-------------------------
Total 39692watts
6. Total divide by 230 172.6 amps
So, is my calculation within the limit of a 200 amp service?
Please respond.
I called the AC guy who will install the duct but will not install the unit. He gave me the cna of the 2 units. The HO will make buyer install them in the future.
House elect calculation
1. Multiply square footage x 3 watts
2. Add 1500 watts for each kitchen small appliances circuit and laundry room ckts
3. Add the wattage for all appliances that are on their own ckts i.e. electric dryer, water heater, range , AC (Check the nameplates and remember that watts =volts x amps)
4. Add the 3 numbers up
Figure the first 10,000 watts at 100% and the remaining watts at 40 %.
5. Add the wattage of either the heating unit or the central AC whichever is greater
6. Divide this figure by 230.
1. 4,200 sq ftx 3 12600 watts
2. 2 appliance load + laundry
3 x 1500 4500 watts
3. Water heater 5500 watts
Dishwashers 1200 watts
Dryer 5500 watts
Garb disposal 1200 watts
Range 8000 watts
Wall mounted oven 3000 watts?
Hot tub 8000 watts?
----------------
32400 watts
-----------------------
49500 watts
4. First 10,000 at 100% 10000 watts
Remaining 39500 at 40% 15800watts
---------------------
Subtotal 25800 watts
5. Central air 13892 watts
4 ton 26.2a x 230=6026 watts
5 ton 34.2 x 230 = 7866 watts
-------------------------
Total 39692watts
6. Total divide by 230 172.6 amps
So, is my calculation within the limit of a 200 amp service?
Please respond.
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