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AL Comp Reducer, Tin Plated 500-400
Manufacturer Resources
Product Specs
- Connection Type:
- Compression
- Country Of Origin:
- United States (US)
- Insulation Material:
- None
- Product Group:
- Wire & Cable Management
- Product Type:
- Compression Splice Reducer
- Selling Unit Of Measure:
- each
- Standards:
- ANSI C119.4
- Surface Finishing:
- Tin Plated
- Type2:
- Wire or cable compression splice
- Department:
- Electrical
- Product Subgroup:
- Splices
- Product Size:
- 8-7/8 inch
Blackburn AC 500 R 400 TN – Frequently Asked Questions
1) What conductor sizes does the Blackburn AC 500 R 400 TN reducer splice join?
The AC 500 R 400 TN is a reducing compression splice that joins a 500 kcmil conductor on one end to a 400 kcmil conductor on the other. It's aluminum bodied and tin plated, so it works on aluminum-to-aluminum or aluminum-to-copper runs where a dual-rated compression connector is called for. Overall length is 8-7/8 inches, which matters when you're checking whether it will fit inside the gutter, pull box, or splice enclosure you're working in.
2) Is the tin plating on this aluminum compression reducer enough to land a copper conductor?
Tin plating over the aluminum body is what makes an AL connector suitable for copper as well, because it keeps bare aluminum from sitting directly against the copper. The AC 500 R 400 TN is tin plated and built to ANSI C119.4, the standard for connectors on distribution and secondary conductors. Use the oxide inhibitor and the crimp sequence the connector calls for, and the correct die for the conductor size on each end.
3) Will this reducer work if both my conductors are 500 kcmil?
No. The AC 500 R 400 TN has two different bores, 500 kcmil on one end and 400 kcmil on the other, so a 500 conductor will not seat properly in the 400 end. For a straight 500 to 500 joint you need a same-size compression splice rather than a reducer. Match the connector's stamped sizes to the actual conductor on each end before you crimp.
4) Does this Blackburn reducer come insulated, or do I have to tape or shrink it myself?
No insulation on it. The AC 500 R 400 TN ships as a bare tin plated aluminum barrel, so the insulation is your responsibility: heat shrink, cold shrink, or tape build, whatever the spec on the job requires. Budget for that in your material list, and account for 8-7/8 inches of connector body plus the shrink when you size the splice space.
5) Can I use a compression reducer instead of a mechanical set screw connector for a 500 to 400 kcmil transition?
Both will make the transition, but they install differently. A compression reducer like the AC 500 R 400 TN is crimped with a hydraulic tool and the matching die, which gives a permanent, tamper-resistant joint and a smaller profile than most set screw bodies. A mechanical connector needs no crimp tool and can be taken apart later, which is why it gets used for maintenance-friendly splices and field changes. If you own the crimper and the splice is permanent, compression is the tidier choice.
6) What standard does this aluminum compression splice reducer meet for a spec submittal?
ANSI C119.4 is the standard listed for the AC 500 R 400 TN, which is the connector standard engineers usually cite for splices and reducers on secondary and distribution conductors. That plus the Blackburn part number AC 500 R 400 TN and the 500 to 400 kcmil range is generally what a submittal reviewer is looking for on a reducing splice.
7) How is the Blackburn AC 500 R 400 TN sold, individually or in a bag?
Sold each. One AC 500 R 400 TN reducer per unit, so order one per splice you're making and count your phases plus neutral accordingly. Made in the United States.
How fast can I get the Blackburn AC 500 R 400 TN delivered?
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Does the Blackburn AC 500 R 400 TN come with a warranty?
Absolutely. The Blackburn AC 500 R 400 TN is backed by a manufacturer’s warranty.
For full warranty terms, check the product documentation or Contact Us.
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