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Old 10-04-2013, 06:35 PM   #1
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Default The Dreaded Nuetral conductor

I got a customer of mine with a 60 amp service in an apartment complex with a $250.00 electric bill. I go to check out his service and I get 15.08 amps on A phase, 13.36 amps on B phase, and 15.15 amps on the neutral with A.C running. I was always taught that the nuetral wire carries the difference of the 2 phase conductors. Any ideas why the neutral current is so high? Voltage was 120 volt from each phase to ground.
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Old 10-04-2013, 06:38 PM   #2
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Originally Posted by whittom View Post
I got a customer of mine with a 60 amp service in an apartment complex with a $250.00 electric bill. I go to check out his service and I get 15.08 amps on A phase, 13.36 amps on B phase, and 15.15 amps on the neutral with A.C running. I was always taught that the nuetral wire carries the difference of the 2 phase conductors. Any ideas why the neutral current is so high? Voltage was 120 volt from each phase to ground.
Was anything else running like a fridge or freezer?
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Old 10-04-2013, 06:40 PM   #3
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Was the voltage 208 by chance between the 2 phases?
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Old 10-04-2013, 06:42 PM   #4
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The complex probably uses 208Y/120 with single phase feeders to each apartment. If this is the case and all the load is phase to neutral, the neutral is exactly where it should be, roughly even with the phase conductors.
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Old 10-04-2013, 06:43 PM   #5
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Was the voltage 208 by chance between the 2 phases?
You type faster than me.
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Old 10-04-2013, 06:43 PM   #6
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Quote:
Originally Posted by whittom
I got a customer of mine with a 60 amp service in an apartment complex with a $250.00 electric bill. I go to check out his service and I get 15.08 amps on A phase, 13.36 amps on B phase, and 15.15 amps on the neutral with A.C running. I was always taught that the nuetral wire carries the difference of the 2 phase conductors. Any ideas why the neutral current is so high? Voltage was 120 volt from each phase to ground.
is there any other branch circuits other than the A/C? There could be circuits on the same phase sharing a neutral. Is this a single phase service or three phase?
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Old 10-04-2013, 07:04 PM   #7
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This is a single phase service. Phase to phase was 242.8 volts. Old fuse panel with 5 circuits in it besides the AC. This is a sub-panel being feed from a 60 amp breaker from an old distribution panel.
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Old 10-04-2013, 07:25 PM   #8
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Could some of the wiring be intermingled with the neighboring units?
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Old 10-04-2013, 07:31 PM   #9
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Could some of the wiring be intermingled with the neighboring units?
Ever go into apt's with mutual walls & see the world plugged into one....?



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Old 10-04-2013, 07:41 PM   #10
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Did you try unplugging the grow lamps?
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Old 10-04-2013, 07:54 PM   #11
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Never use the DOLLARS on an electric bill to indicate a problem.

Look at the WATTHOURS. Compare several months of use.....that will tell you if there's an electrical issue.

It could easily be an annual adjustment due to budget billing.
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Old 10-04-2013, 08:01 PM   #12
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Did you try unplugging the grow lamps?







Quote:
Originally Posted by whittom View Post
This is a single phase service. Phase to phase was 242.8 volts. Old fuse panel with 5 circuits in it besides the AC. This is a sub-panel being feed from a 60 amp breaker from an old distribution panel.
Is it possible a load could've switched on or off in between the readings?
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Old 10-04-2013, 10:43 PM   #13
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This is a single phase service. Phase to phase was 242.8 volts. Old fuse panel with 5 circuits in it besides the AC. This is a sub-panel being feed from a 60 amp breaker from an old distribution panel.
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Old 10-05-2013, 11:11 AM   #14
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Originally Posted by whittom View Post
I got a customer of mine with a 60 amp service in an apartment complex with a $250.00 electric bill. I go to check out his service and I get 15.08 amps on A phase, 13.36 amps on B phase, and 15.15 amps on the neutral with A.C running. I was always taught that the nuetral wire carries the difference of the 2 phase conductors. Any ideas why the neutral current is so high? Voltage was 120 volt from each phase to ground.
Test with only 240v load(s), then test with only 120v loads. This may give a more comprehensive picture.
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