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Service entrance cable size for 100 amp and 200 amp service.

Asked Nov 1, 2008, 11:10 AM — 14 Answers
I would like to know what size aluminum sec I would need for 100 or 200 amp service

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14 Answers
stanfortyman's Avatar
stanfortyman Posts: 4,921, Reputation: 1351
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#2

Nov 1, 2008, 01:52 PM


#2 for 100A
4/0 for 200A
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brianbadbrian's Avatar
brianbadbrian Posts: 1, Reputation: -1
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#3

Nov 2, 2011, 09:45 PM
100 amp #4cu or #2al

200 amp #2/0cu or #4/0al . . .

try looking at the the NEC for service entrance conductor ampacity before you answer stan . ..
stanfortyman (Apr 5, 2012 04:26 AM): NA   Source:
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tkrussell's Avatar
tkrussell Posts: 9,673, Reputation: 3698
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#4

Nov 3, 2011, 02:41 AM


And what exactly is incorrect about Stan's answer?
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stanfortyman's Avatar
stanfortyman Posts: 4,921, Reputation: 1351
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#5

Nov 3, 2011, 03:55 AM


Quote:
Originally Posted by brianbadbrian View Post
try looking at the the NEC for service entrance conductor ampacity before you answer stan . ..
Hmmm....I actually find this pretty funny.
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donf's Avatar
donf Posts: 4,838, Reputation: 2738
Printers & Electronics Expert
  
#6

Nov 3, 2011, 05:24 AM
Brian,

Try reading the question before running off with the mouth.

The OP only asked for the sizes for Aluminum conductors. Stan gave the correct answer.
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cre8tive31's Avatar
cre8tive31 Posts: 6, Reputation: 1
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#7

Apr 4, 2012, 07:48 PM
What seize wires do I need from the meter can to a transfer switch for a standby generator. And also what seize do I need from the transfer switch to the service panel going into conduits. How many singles
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stanfortyman's Avatar
stanfortyman Posts: 4,921, Reputation: 1351
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#8

Apr 5, 2012, 04:28 AM
Quote:
Originally Posted by cre8tive31 View Post
What seize wires do I need from the meter can to a transfer switch for a standby generator. And also what seize do I need from the transfer switch to the service panel going into conduits. How many singles
All we know is you want to install a transfer switch.

What size service?
What size transfer switch?
What size generator?
What size conduits?
What are "singles"?

What is your location?
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cre8tive31's Avatar
cre8tive31 Posts: 6, Reputation: 1
New Member
  
#9

Apr 6, 2012, 02:40 AM
200A service.
200A automatic transfer switch with service disconnect.
20,000KW GE whole house generator.
1 1/2" or 2" PVC conduit depending on wire seize.
Single wires from meter can to transfer switch and from transfer switch to 200A service panel using PVC conduit.

location.
Bloomfield CT.
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stanfortyman's Avatar
stanfortyman Posts: 4,921, Reputation: 1351
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#10

Apr 6, 2012, 12:14 PM
Very good. Thank you.

You'll need typical 4/0AL or 2/0CU, three conductors, from the meter to the transfer switch. You can downsize the neutral if you like. 2" is typical.

From the transfer switch to the panel you'll need four wires, using a dedicated equipment ground, this can be #4cu. 2" will work as well.
Remember, the main panel will now become a sub-panel, so all the grounds will need to be separated from the neutral bar and a dedicated ground bar installed, and the neutral bond removed.

From the generator to the transfer switch you'll need #4cu minimum, also running four wires. I'd do a separate 1" for the power and a 3/4" for the controls.
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