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Manufacturer Resources
Product Specs
- Country Of Origin:
- United States (US)
- Material Of Conductor:
- Bronze
- Product Group:
- Grounding & Bonding
- Product Type:
- Grounding devices or assemblies
- Selling Unit Of Measure:
- each
- Type2:
- Grounding devices or assemblies
- Department:
- Electrical
- Product Subgroup:
- Ground Clamps
Blackburn GPL21-TB – Frequently Asked Questions
1) What wire sizes does the Blackburn GPL21-TB ground clamp accept?
The GPL21-TB is rated for grounding conductors from 4 solid up to 2/0, so it covers the common range from a #4 solid ground electrode conductor on a residential service through 2/0 stranded on larger commercial services. If your grounding electrode conductor is smaller than #4 or larger than 2/0, this is the wrong clamp.
2) Is the Blackburn GPL21-TB clamp bronze, and will it hold up buried or in a damp meter pit?
Bronze is the conductor material on the GPL21-TB. Bronze is the standard body material for direct-burial and damp-location ground clamp use because it resists corrosion and is compatible with copper conductors, unlike zinc or plated steel hardware that degrades faster in soil contact.
3) Is the Blackburn GPL21-TB made in the USA for a Buy American job?
Country of origin on the GPL21-TB is the United States, which is the documentation a government, school district, or federally funded project needs when domestic sourcing is a condition of the contract.
4) What is the exact part number and how is the Blackburn ground clamp packaged, single piece or bulk?
Order it as Blackburn GPL21-TB. It sells as each, so one clamp per unit rather than a carton quantity, which is what you want when you are picking up one or two for a service replacement rather than stocking a truck.
How fast can I get the Blackburn GPL21-TB 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 GPL21-TB come with a warranty?
Absolutely. The Blackburn GPL21-TB 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 GPL21-TB?
You can call, text, or email our expert support team for fast answers. We’re here to help with
product
selection,
installation tips, and troubleshooting. Contact Us
Why buy the Blackburn GPL21-TB from ZenSupply?
ZenSupply makes it easy to get the commercial door hardware you need—fast shipping, expert support,
and
rewards on
every order.
Our team is always ready to help you choose the right product for your project.