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Manufacturer Resources
Product Specs
- Country Of Origin:
- India (IN)
- Insulation Material:
- No
- Material Of Conductor:
- Copper
- Product Group:
- Grounding & Bonding
- Product Net Depth Length:
- 4-15/16 in
- Product Type:
- Ground Clamp
- Selling Unit Of Measure:
- each
- Standards:
- UL E3060, CSA 12798
- Type2:
- Grounding devices or assemblies
- Department:
- Electrical
- Product Subgroup:
- Ground Clamps
Blackburn GUV21221 – Frequently Asked Questions
1) What conductor sizes does the Blackburn GUV21221 ground clamp take?
The GUV21221 U-bolt ground clamp covers a conductor range of 2/0 through 4 AWG, so one clamp handles the common grounding electrode conductor sizes an electrician runs on a service without stocking several part numbers.
2) Can I use a U-bolt ground clamp like the Blackburn GUV21221 with aluminum ground wire?
It is built for copper conductors, so pair it with copper grounding electrode conductor. If your run is aluminum or copper-clad aluminum, choose a clamp rated for that conductor material instead.
3) Is the Blackburn GUV21221 ground clamp UL listed for inspection sign-off?
Yes. The clamp carries UL E3060 and CSA 12798, which is what an inspector looks for on a grounding electrode connection in a commercial or institutional facility.
4) How big is the Blackburn GUV21221 U-bolt clamp, and will it clear a tight meter-base or rod location?
Net depth/length is 4-15/16 inches. That is the figure to measure against when the ground rod or pipe sits close to a wall, a meter base, or other equipment, since a U-bolt clamp needs room on both sides for the nuts and a wrench.
5) When should I use a U-bolt ground clamp instead of an acorn-style rod clamp?
A U-bolt clamp like the GUV21221 wraps the electrode and pulls the conductor down under a pressure bar, which suits larger 2/0 to 4 AWG conductors and pipe or rod electrodes where you want mechanical grip on a range of diameters. An acorn clamp is the simpler, cheaper choice for a single small ground rod with a smaller conductor. For bonding to water pipe on a service, confirm the clamp is listed for the pipe size you are landing on.
6) Does the Blackburn GUV21221 ground clamp come insulated or with a cover?
No insulation or cover is part of it, it is a bare mechanical clamp. Any protection over the connection, such as an in-ground rod cover or a splice enclosure, is a separate item to order.
7) Is the Blackburn GUV21221 sold individually or in a box quantity?
It sells each, one clamp per unit, so order the exact count your job takes rather than buying a carton.
8) Where is the Blackburn GUV21221 made? I need country of origin for a government submittal.
Country of origin is India. That is the value to put on a Buy American or trade-compliance submittal for this clamp.
How fast can I get the Blackburn GUV21221 delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the
continental
U.S.
Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit,
reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Blackburn GUV21221 come with a warranty?
Absolutely. The Blackburn GUV21221 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Blackburn GUV21221?
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product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Blackburn GUV21221 from ZenSupply?
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and
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