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Manufacturer Resources
Product Specs
- Connection Type:
- Bolted
- Country Of Origin:
- Mexico (MX)
- Insulation Material:
- None
- Number Of Conductors:
- 2
- Product Group:
- Grounding & Bonding
- Product Type:
- Parallel-Groove Clamp
- Selling Unit Of Measure:
- each
- Type2:
- Wire or cable compression splice
- Department:
- Electrical
- Product Subgroup:
- Ground Clamps
- Product Size:
- Height 2 X Length 1-3/8 X Width 1-5/8 inch, Bolt 3/8 inch
- Installation Category:
- None
- Product Material:
- Aluminum
Blackburn PAE2121X-79 – Frequently Asked Questions
1) What wire sizes does the Blackburn PAE2121X-79 parallel groove clamp take?
The PAE2121X-79 covers 2/0 through 8 conductors, per the product designation, and it lands two conductors, one in each groove. That range makes it a fit for typical service ground and bonding runs where you are tapping a smaller conductor off a larger one.
2) Can I use this aluminum parallel groove clamp on copper conductors?
The body is aluminum, and it ships with Contax joint compound for the connection. Aluminum bodied parallel groove clamps of this type are used for aluminum to aluminum, and for aluminum to copper only where the clamp is rated dual metal; the compound inhibits oxide on aluminum strands and helps the connection stay low resistance. If your run is copper to copper, specify a copper or bronze bodied clamp instead.
3) Can this clamp be used to tap two different wire sizes together, like 2/0 to a #6?
Yes. The two grooves take two conductors anywhere in the 2/0 through 8 range, so a large run conductor and a smaller tap can be landed in the same clamp and tightened on the single 3/8 inch bolt. Apply the supplied Contax compound to both conductors before you close it up.
4) What size wrench or socket do I need to install the PAE2121X-79 clamp?
It uses a 3/8 inch bolt, so a 3/8 inch hardware socket is what you need on the job. The clamp is a bolted connection, no crimping tool or die set required, which is why crews use these for field taps and repairs where a hydraulic press is not practical.
5) How much space does this parallel groove clamp need in a ground bar enclosure or handhole?
Overall it measures Height 2 x Length 1-3/8 x Width 1-5/8 inch, with a 3/8 inch bolt. Allow clearance above the 2 inch height for socket access on the bolt. There is no insulation or boot on the clamp, so the finished connection is bare metal and needs to sit where it will not contact other energized parts.
6) Is a parallel groove clamp the right choice, or should I use a compression splice?
A parallel groove clamp like the PAE2121X-79 is a bolted mechanical connection that functions as a wire or cable splice or tap, and it can be loosened and re-made. A compression splice is permanent and needs the matching die and tool. Pick the bolted clamp when you want a field serviceable tap, for grounding and bonding work, or when you have no press on site. Pick compression when the connection is buried, encased, or spec'd irreversible.
7) Does the PAE2121X-79 come with the joint compound, or do I buy that separately?
Contax joint compound is included with the clamp, so there is no separate tube to order to make the connection. Nothing else is supplied; the 3/8 inch bolt is part of the clamp assembly. It sells as each, so order one per connection point.
8) I need to standardize grounding clamps across a facility. What is the exact part number and where is it made?
Order by Blackburn manufacturer part number PAE2121X-79. It is an aluminum parallel groove clamp, 2/0 to 8 range, supplied with Contax compound, and made in Mexico. Sold individually.
How fast can I get the Blackburn PAE2121X-79 delivered?
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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 PAE2121X-79 come with a warranty?
Absolutely. The Blackburn PAE2121X-79 is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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