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The code that ate my brain #80437
04/15/02 07:31 PM
04/15/02 07:31 PM
S
sparky  Offline OP
Member
Joined: Oct 2000
Posts: 5,371
My calc's show a 5% VD on a 120v 20a circuit @ 75' , my ideal tester shows similar results. ALL the circuits I run when i wire a residence, save dedicated runs, are usually more than this length in total...

comments? suggestions? discussion? [Linked Image]

[Linked Image]

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Re: The code that ate my brain #80438
04/15/02 07:54 PM
04/15/02 07:54 PM
C
Chris Rudolph  Offline
Member
Joined: May 2001
Posts: 160
Winter Park,Fl USA
Does this mean that all your 20 amp circuits with #12 wire are loaded to the full load of almost 20 amps,just shy of tripping the breaker?

Chris

Re: The code that ate my brain #80439
04/15/02 08:23 PM
04/15/02 08:23 PM
G
George  Offline
Member
Joined: Feb 2002
Posts: 375
16amps is the correct design load for a 20amp circuit.

20amps is a lot of continous power for a residence. At 10amps and 120v you can go 150 ft before a 5% voltage drop on the same circuit.

I like to run 50amp 240v to subpanels and then feed 20amp circuits from those. It solves the voltage drop problem.

Re: The code that ate my brain #80440
04/15/02 10:26 PM
04/15/02 10:26 PM
E
ElectricAL  Offline
Member
Joined: Oct 2001
Posts: 597
Minneapolis, MN USA
What does the PoCo deliver to the Bus in your area? Around the seven county Metro Area here I commonly measure 126 V to ground at the service disconnect.

With the standard set at 120, at what point do I start tracking 5% of which voltage?


Al Hildenbrand
Re: The code that ate my brain #80441
04/15/02 10:27 PM
04/15/02 10:27 PM
W
watthead  Offline
Member
Joined: Oct 2001
Posts: 172
South Carolina
I would think that this is why most of us routinely install more than the minimum number of circuits required by code, and increase the conductor size when we run into the occasional circuit that is expected to be heavily loaded. This method will not produce the lowest possible installed cost, but it does allow you to sleep better, at least untill you get the service call for the 59 cent switch that failed.

Re: The code that ate my brain #80442
04/15/02 10:31 PM
04/15/02 10:31 PM
B
BrianSparky  Offline
Member
Joined: Jan 2002
Posts: 38
Lakewood,CO
Hey Sparky,
Is that sculpture by DeVries?
-Brian

Re: The code that ate my brain #80443
04/16/02 04:49 AM
04/16/02 04:49 AM
S
sparky  Offline OP
Member
Joined: Oct 2000
Posts: 5,371
Quote
16amps is the correct design load for a 20amp circuit.


agreed George....so we'd be looking for the 'dedicated' or maximum load. yet the ideal tester has a 15a & 20a setting. So to use the 15a setting on a 20a circuit would be close?

Quote
Does this mean that all your 20 amp circuits with #12 wire are loaded to the full load of almost 20 amps,just shy of tripping the breaker?

Chris, i suppose an arguement could be made for a non-continuos load?

Quote
What does the PoCo deliver to the Bus in your area?

Al, it's inconsistent, so another variable to deal with.

Quote
Is that sculpture by DeVries?

Briansparky, dunno..ripped it off google...
[Linked Image]

Re: The code that ate my brain #80444
04/16/02 06:52 AM
04/16/02 06:52 AM
Bill Addiss  Offline
Member
Joined: Oct 2000
Posts: 3,903
NY, USA
Sparky(s)

The Sculpture is a work by 'Edd Hayes'
You can see more at; http://www.eddhayes.com/

Some good stuff there.

Bill

Re: The code that ate my brain #80445
04/16/02 10:09 AM
04/16/02 10:09 AM
B
Bjarney  Offline
Moderator
Joined: Apr 2002
Posts: 2,527
West-Southern Inner-Northeast ...
Great picture, but one question...was his rod tested at the proper 100kV/foot level?

Re: The code that ate my brain #80446
04/16/02 07:17 PM
04/16/02 07:17 PM
Tom  Offline
Member
Joined: Jan 2001
Posts: 1,044
Shinnston, WV USA
I have only seen one voltage drop problem in a residence & it was a double wide that had to have near 150 feet of 14-2 to the furthest outlet. When one of those 12 amp vacuum cleaners was plugged into it, it about choked, voltage fell to 85-90 volts.

The homeowner had hired me to find code violations so he could sue the home builder.I found a few, but couldn't help him with the voltage drop problem.


Few things are harder to put up with than the annoyance of a good example.
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