This can be a difficult question to answer because more info is needed. Are you saying the building is detached, a separate structure from where it is being fed??steveng said:i have and outdoor 125 amp panel being fed from a 480/240 xfmr inside adjacent bldg,the feeder conductors and neutral are #6 thhn, no equipment grounding conductor at panel,
should the neutral wire be bonded to the ground bus terminal?
JohnJ0906 said:Is metal conduit being used?
Dennis Alwon said:This can be a difficult question to answer because more info is needed. Are you saying the building is detached, a separate structure from where it is being fed??
tom baker said:Yes this is a separately derived system, a system bonding jumper is required at the transformer or first disconnecting means
Yes--Rich Elec. said:A new gec would be established and it would be bonded at the new panel, correct?
RUWired said:This is a single phase 3-wire secondary xfrmx and would need ocpd with in the first 10'.
are you talking about the service disconnect to the xfmr?
the service disconnect feeding the xfmr is fused at 30 amps. it is located next to the xfmr, there is no ocpd on the secondary side of the xfmr, just the load panel no main, 8 20 amps
single pole breakers, 2 two poles , not used
according to 250.30, you are not supposed to ground the neutral on seperately derived systems, am i reading something wrong?
Yes. What sentence brings you to that conclusion?steveng said:according to 250.30, you are not supposed to ground the neutral on seperately derived systems, am i reading something wrong?
steveng said:RUWired said:This is a single phase 3-wire secondary xfrmx and would need ocpd with in the first 10'.
are you talking about the service disconnect to the xfmr?
the service disconnect feeding the xfmr is fused at 30 amps. it is located next to the xfmr, there is no ocpd on the secondary side of the xfmr, just the load panel no main, 8 20 amps
single pole breakers, 2 two poles , not used
according to 250.30, you are not supposed to ground the neutral on seperately derived systems, am i reading something wrong?
The service disconnect to the primary side of the xfrmr does not satisfy the requirements of 240.21(C).
Article 250.30 is saying that on separately derived systems that are grounded such as your xfrmr,the connection of the grounded conductor must be made either at the xfrmr or the first ocpd and where that connection is made the GEC must be brought to that point.It is also saying that no other grounding of the grounded conductor can be made on the load side of that connection,except incases of feeders to seperate buildings meeting the requirements of 250.32
Rick
LarryFine said:Yes. What sentence brings you to that conclusion?[/QUOTe
thanks for all the help, im gonna keep at it till i get it right!
RUWired said:steveng said:The service disconnect to the primary side of the xfrmr does not satisfy the requirements of 240.21(C).
Article 250.30 is saying that on separately derived systems that are grounded such as your xfrmr,the connection of the grounded conductor must be made either at the xfrmr or the first ocpd and where that connection is made the GEC must be brought to that point.It is also saying that no other grounding of the grounded conductor can be made on the load side of that connection,except incases of feeders to seperate buildings meeting the requirements of 250.32
Rick
i need to work under a master so i can make it to that level, the journeyman i learned under didnt know very much, but he sure made you think he knew everything. a regular bs artist:grin:
Not always right, but never in doubt. :roll:steveng said:i need to work under a master so i can make it to that level, the journeyman i learned under didnt know very much, but he sure made you think he knew everything. a regular bs artist:grin:
Bea said:Read 240.21.C(4) Outside secondary conductors