5 IN INSL GRND BUSH W/ 8-2/0 RANGE
Manufacturer Resources
Product Specs
- Number Of Batteries:
- 0
- Product Group:
- Grounding & Bonding
- Product Type:
- Grounding Bushing
- Department:
- Electrical
- Product Subgroup:
- Grounding & Bonding
- Product Material:
- Malleable Iron
Thomas & Betts 3865 – Frequently Asked Questions
1) What wire sizes will the lug on the Thomas & Betts 3865 bushing accept?
The lug range on the 3865 is 8 AWG through 2/0, so it takes anything from a small 8 AWG equipment grounding conductor up to a 2/0 bonding jumper. If your grounding electrode or bonding conductor is larger than 2/0, this bushing's lug will not terminate it.
2) What is a comparable insulated grounding bushing to the Thomas & Betts 3865?
The American Fittings GB is an insulated grounding bushing built in zinc-plated alloy steel with an aluminum lug, which puts it in the same role as the Thomas & Betts 3865 insulated grounding bushing. The main material difference is that the 3865 body is malleable iron, while the GB body is zinc-plated alloy steel with an aluminum lug, so if your spec calls out a malleable iron fitting the 3865 is the one that meets it.
3) I need to ground a conduit that is already installed and cannot be unthreaded - is the Thomas & Betts 3865 the right bushing?
For an existing run you cannot break loose, a split bushing is the better choice. The Bridgeport Fittings SGBS-388CL Mighty-Rite is an insulated split grounding bushing in steel with an aluminum lug, sized 3 inch, and it assembles around the conduit rather than threading on over the end. The Thomas & Betts 3865 is a one-piece insulated grounding bushing, so it suits new work or any point where you can get the conduit end free.
4) Do I need an insulated grounding bushing or will a plain insulating bushing do?
Two different parts. A plain insulating bushing only protects the conductors at the conduit end; it has no lug and no bond path. The Thomas & Betts 3865 does both, with an insulated throat plus an 8-2/0 lug for a bonding jumper back to the enclosure ground bus. If you are pulling a bonding jumper at a 5 inch service or feeder raceway, you want the lug type.
5) Can I use the 3865 on a conduit already installed in an enclosure, or does it have to go on before the pull?
The 3865 is a solid threaded bushing, so it has to be threaded onto the conduit end before conductors are pulled or with the conduit accessible. If you need to add a bonding bushing to a raceway that is already made up, look at a split-style bushing such as the Bridgeport Mighty-Rite SGBS-388CL, which is built to go on without breaking the connection.
6) My drawing calls for a copper equipment grounding bushing - can I use the Thomas & Betts 3865?
If the spec names copper, look at the ABB A-Series TGC2, which is a copper equipment grounding bushing for box-bonded conduit. The Thomas & Betts 3865 is a malleable iron insulated grounding bushing with an 8 to 2/0 conductor range, so it answers a different material callout. Match the fitting to whichever material your drawing states.
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Does the Thomas & Betts 3865 come with a warranty?
Absolutely. The Thomas & Betts 3865 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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