Mike Dolt Enterprises
Mike Dolt Enterprises
User: ammklq143, Location: Iowa
Asked on: Wednesday, March 30, 2011 at 9:52 am EDT
Answered on: Tuesday, May 14, 2024 at 3:28 am EDT
Question: I am a new contractor and I'm bidding on a shed for a farmer. It's 6000 sq. ft. and he gave me a copy of a bid from another contractor (without pricing) to use so we bid the same materials. The other contractor has 400 ft. of 250mcm - 250mcm - 3/0 direct burial, which seems find, but then has 400 ft. of #6 green THHN Cu. Is it ok to bury the #6 THHN? Also, do I need to have an UFER ground and a ground rod?Thank you all for sharing your wisdom with others.
#6 Green THHN Cu Burial
No, it is not acceptable to bury #6 green THHN Cu. According to the National Electrical Code (NEC), only conductors rated for direct burial use can be installed underground. #6 green THHN Cu is not rated for direct burial.
UFER Ground and Ground Rod
Whether you need both a UFER ground and a ground rod depends on the soil conditions and local codes. UFER Ground
A UFER ground consists of a metal electrode that is buried in direct contact with the moist soil below the footing of a building. It is typically used where the soil has low resistivity and is a good conductor of electricity.
Ground Rod: A ground rod is a vertical metal rod that is driven into the ground. It is typically used where the soil has high resistivity and is not a good conductor of electricity.In some cases, both a UFER ground and a ground rod may be required to achieve an effective ground path. Your local codes should provide guidance on the specific requirements for your area. Flag for review