How Would You Determine If The Wire Running TO The Box Is 200amp? - Electrical - DIY Chatroom Home Improvement Forum

 DIY Chatroom Home Improvement Forum How would you determine if the wire running TO the box is 200amp?
 Register Blogs Articles Rewards Search Today's Posts Mark Forums Read

12-26-2015, 09:19 AM   #1
Member

Join Date: Dec 2015
Posts: 53
Rewards Points: 108

by the breaker protecting it or by the wire size. The wire size is the best measure.

12-26-2015, 12:09 PM   #2
Member

Join Date: Mar 2005
Location: Welland, Ontario
Posts: 13,441
Rewards Points: 13,682
Blog Entries: 11

The size of the wire determines the max breaker. You can always use a smaller breaker if you want.

12-26-2015, 01:52 PM   #3
Member

Join Date: Mar 2011
Location: NE Oklahoma
Posts: 891
Rewards Points: 1,697

Quote:
 Originally Posted by hueco by the breaker protecting it or by the wire size. The wire size is the best measure.
It's not clear whether you're asking a question, and what that question might be, or if you're simply posting a tip.

Wire is never 200 amp, or 15 amp, or 20 amp. 12 gauge wire will carry 200 amps - for a second or so. Wire has current rating. Circuit breakers have current ratings. You want the rating of the circuit breaker to be less than, or equal to, the current rating of the wire - because you would likely have a fire long before you get to the limit (not the rating) of the wire.

But your subject line seems to ask about the rating of the wire. You can only get that from the wire. The circuit breaker serves to protect the wire should you exceed that rating.

 12-26-2015, 07:20 PM #4 Member   Join Date: Dec 2015 Posts: 53 Rewards Points: 108 #12 is never rated for 200 amps, but such a question is about right for a DIY forum and, in fact, there is a whole lot more to it than that. Recommend obtaining an UGLY'S book which is the best, handy reference book to use. My reply assumed the question regarded how one can tell the amperage of a service by the size of the conductors.
 12-26-2015, 07:59 PM #5 A "Handy Husband"     Join Date: Feb 2007 Location: South Carolina Low Country Posts: 7,576 Rewards Points: 4,252 The size of the service conductors can only show the maximum possible capacity permitted by code. I could use a service conductor with a capacity for 200 amps and use it for a 100 amp service. Or I could us a service conductor with a capacity of 100 amps to feed a 200 amp service. Of course the second example is a code violation. The size of the service is determined by a combination of the capacity of the meter socket, the service conductors and the main disconnect. __________________ Location: Coastal South Carolina
12-26-2015, 10:40 PM   #6
Member

Join Date: Sep 2012
Posts: 2,512
Rewards Points: 1,832

The code permits (310.15 (B) 7 ) incoming service conductors for dwellings to be reduced by a factor of 83% over what they normally would be.

#2 AL is good for a 100amp service and 4/0 is good for a 200 amp service.

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are Off Pingbacks are Off Refbacks are Off Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post Abs777 Electrical 4 03-08-2010 01:43 PM RyanD Electrical 7 08-07-2009 02:33 PM wallstreet Electrical 5 06-17-2009 03:16 PM ponch37300 Electrical 4 04-21-2009 03:58 PM 4x15mph Electrical 8 11-24-2008 01:00 PM

Top of Page | View New Posts