DumbLineman17
Member
- Location
- Freedom, Idaho
- Occupation
- Journeyman Lineman
Hello,
Looking to find code references to single phase over head distribution transformers supplying 120/240 3w service. My question is: Does the neutral conductor - usually a 2/0 or 4/0 copper for most 15kVA to 100kVA transformers - for the X2 have to be directly connected to the system neutral on a Wye distribution system? Many utilities I have worked for have a common practice of connecting this neutral (X2) "transformer leg" directly to the system neutral. I have been working under very old standards/"specs" for a small utility that does not do this commonly accepted practice. Instead this old, outdated utility uses a #4 solid copper conductor between the 2/0 or 4/0 copper "transformer leg".
Again, looking for direct words in the NEC or any code reference/s.
Thank you in advance,
Just a dumb lineman.
Looking to find code references to single phase over head distribution transformers supplying 120/240 3w service. My question is: Does the neutral conductor - usually a 2/0 or 4/0 copper for most 15kVA to 100kVA transformers - for the X2 have to be directly connected to the system neutral on a Wye distribution system? Many utilities I have worked for have a common practice of connecting this neutral (X2) "transformer leg" directly to the system neutral. I have been working under very old standards/"specs" for a small utility that does not do this commonly accepted practice. Instead this old, outdated utility uses a #4 solid copper conductor between the 2/0 or 4/0 copper "transformer leg".
Again, looking for direct words in the NEC or any code reference/s.
Thank you in advance,
Just a dumb lineman.