Service entrance neutral CCC
- Thread starter mjmike
- Start date
- Status
- Location
- Connecticut
- Occupation
- Engineer
Yes.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Why wouldn't the service entrance grounded conductor also be a neutral?
kwired
Electron manager
- Location
- NE Nebraska
A "neutral conductor" is usually required to be the conductor of the system that is grounded when you have a grounded system.
Not all "grounded conductors" are necessarily neutral conductors though. Take a corner grounded delta system for example - the grounded conductor is not a neutral conductor. A two wire system also has no neutral, but you very well may ground one of those conductors.
If dealing with a system that doesn't have a "neutral" then 310.15(B)(5) doesn't apply at all. If you do have a neutral then you need to further proceed through (B)(5) until you find the situation you do have and apply accordingly.
Not all "grounded conductors" are necessarily neutral conductors though. Take a corner grounded delta system for example - the grounded conductor is not a neutral conductor. A two wire system also has no neutral, but you very well may ground one of those conductors.
If dealing with a system that doesn't have a "neutral" then 310.15(B)(5) doesn't apply at all. If you do have a neutral then you need to further proceed through (B)(5) until you find the situation you do have and apply accordingly.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Good point.
I was thinking in terms of the 3 most common systems, single phase 120/240, WYE, and 3 phase 4 wire Delta.
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
250.26 is a good place to look at for this topic.
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
And also we could have a neutral that is not grounded. It would be very rare but is nec permitted at certain voltages.
kwired
Electron manager
- Location
- NE Nebraska
correct
jumper
Senior Member
- Location
- 3 Hr 2 Min from Winged Horses
No, no, no. Don't talk about stuff like that.
I want all my noodles grounded. It gives me a warm and fuzzy feeling so I sleep better at night.
Someone here once mentioned an ungrounded WYE and I believe it has scarred me for life.
kwired
Electron manager
- Location
- NE Nebraska
For typical premises wiring systems yes, you usually want the neutral grounded. For specialty application maybe not.
There is high impedance ground systems also.
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