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Old 03-20-2017, 06:41 PM   #1
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Smile Number of circuits? *Challenge Question*

Number of circuits required for the lighting load of an 8000 sq.ft. residence?
Any guesses?
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Old 03-20-2017, 06:49 PM   #2
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ONE! They're all 9W LEDs. What do I win?
P&L
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Old 03-20-2017, 06:53 PM   #3
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ONE! They're all 9W LEDs. What do I win?
P&L
Another ct!
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Old 03-20-2017, 06:53 PM   #4
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5 or 7. 25 or 6 to 4.
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Old 03-20-2017, 06:55 PM   #5
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Homework question Tangent?
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Old 03-20-2017, 06:57 PM   #6
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Number of circuits required for the lighting load of an 8000 sq.ft. residence?
Any guesses?
Table 220.12 & Table 220.42
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Old 03-20-2017, 07:00 PM   #7
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Well this is my guess? 17
(14) 15A + (2) 20A small appliance loads + (1) 20A laundry
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Old 03-20-2017, 07:02 PM   #8
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Homework question Tangent?
You better believe it!
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Old 03-20-2017, 07:06 PM   #9
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ONE! They're all 9W LEDs. What do I win?
P&L
TELL HIM WHAT HE WINS BOB!
A new 9w individual LED with no driver.
*Batteries not included*
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Old 04-30-2017, 02:38 PM   #10
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zero, what no-one else lives around the amish
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Old 04-30-2017, 06:43 PM   #11
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(14) 15a
(10) 20a
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Old 04-30-2017, 07:11 PM   #12
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Number of circuits required for the lighting load of an 8000 sq.ft. residence?
Any guesses?
Zero, residence is not part of the NEC. Dwelling?
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Old 05-02-2017, 12:38 PM   #13
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zero, what no-one else lives around the amish
I heard many Amish have electricity but hide it from their bishop.
I saw it on TV......
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Old 05-02-2017, 07:08 PM   #14
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Originally Posted by Tangent View Post
Well this is my guess? 17
(14) 15A + (2) 20A small appliance loads + (1) 20A laundry
Are required small appliance, and laundry branch ckts. part of the lighting and general use branch ckts calc.?
What about range and dryer loads?
A/C, water heater?
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Old 05-02-2017, 07:10 PM   #15
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Quote:
Originally Posted by Tangent View Post
Number of circuits required for the lighting load of an 8000 sq.ft. residence?
Any guesses?
Remember, 'required' = 'minimum'.

I say (5) 20A or (6) 15A.
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Old 05-03-2017, 05:36 AM   #16
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Quote:
Originally Posted by Tangent View Post
Number of circuits required for the lighting load of an 8000 sq.ft. residence?
Any guesses?
3 20 amp circuits-- laundry and small appliance branch circuit.

8000 x 3 = 24000

first 3000 @ 100% 3000
21000@ 35% = 21000 x .35 = 7350

15 amp x 120 v = 1800
20 amps x 120 = 2400

7350/ 1800 = 4.08 Technically 4 circuits should work however I am not certain 220.5 would apply here so I would say 5 circuits @ 15 amps

7350/2400 = 3.06 therefore 4 - 20 amp circuits Plus the 3 for the small app
means

7- 20 amp circuits

or

3 - 20 amp circuits and 5 - 15 amp circuits
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Old 05-03-2017, 06:16 AM   #17
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Originally Posted by Dennis Alwon View Post
3 20 amp circuits-- laundry and small appliance branch circuit.

8000 x 3 = 24000

first 3000 @ 100% 3000
21000@ 35% = 21000 x .35 = 7350

15 amp x 120 v = 1800
20 amps x 120 = 2400

7350/ 1800 = 4.08 Technically 4 circuits should work however I am not certain 220.5 would apply here so I would say 5 circuits @ 15 amps

7350/2400 = 3.06 therefore 4 - 20 amp circuits Plus the 3 for the small app
means

7- 20 amp circuits

or

3 - 20 amp circuits and 5 - 15 amp circuits
Dennis, shouldn't you add the first 3,000 VA to whatever gets multiplied by 35%?

3,000+(21,000 x 0.35) = 10,350
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Old 05-03-2017, 06:23 AM   #18
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I forgot about this:

Quote:
220.42 General Lighting. The demand factors specified in
Table 220.42 shall apply to that portion of the total branch circuit
load calculated for general illumination. They shall
not be applied in determining the number of branch circuits
for general illumination.
I wish to amend my previous post.

Technically, only one should be required.
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Old 05-03-2017, 07:14 AM   #19
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Quote:
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Dennis, shouldn't you add the first 3,000 VA to whatever gets multiplied by 35%?

3,000+(21,000 x 0.35) = 10,350
Yes-- did this at 4 am or so Lying in bed just like Brian Wilson did... thanks

10350/1800=6 15 amp and 3 - 20 amp circuits

Last edited by Dennis Alwon; 05-03-2017 at 07:22 AM.
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Old 05-03-2017, 07:24 AM   #20
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I forgot about this:



I wish to amend my previous post.

Technically, only one should be required.
I bet the test will not come up with that as an answer....LOL
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