Frequently Asked Questions - Aluminum SEU

What special instructions should I follow when using Aluminum SEU?
Aluminum SEU is a cable used as panel feeder within multiple unit buildings but it may also be used for branch circuits. When using this cable, there are instructions you need to follow. While you may use the cables in wet locations, you should not exceed operating temperatures of 90 degrees Celsius. The voltage rating should be 600 volts. When using the cables, if they are terminated to equipment having circuits rated 100amps or less, the maximum temperature rating should be 60 degrees Celsius. If the circuits are rated over 100amps, then the temperatures can be up to 70 degrees Celsius. Generally, you should not exceed temperature of 90 degrees Celsius whether in dry or wet locations.

How are Aluminum SEU cables constructed?
Aluminum SEU cable consists of compact strands made using 8000 series aluminum material. The cables have an insulation cover made of cross linked polyethylene (XLP) TYPE XHHW-2 and the conductors are cabled alongside a bare copper ground with a reinforced binder tape cover. A polyvinyl chloride (PVC) jacket is used for enhanced protection.

How can I identify Aluminum SEU cable?
The cable has compacted strands made of 8000 series aluminum and have XHHW-2 specification. If you strip off the insulation, you will see the conductor look light grayish, which is the color of aluminum. The insulation is made of cross linked polyethylene and the jacket is looks gray and is made of polyvinyl chloride (PVC).

What are the specifications of Aluminum SEU cable?
The Aluminum SEU cables are designed with 8000 series aluminum alloy meeting ASTM B-801 requirements. They are listed UL 44 and UL 854 while also meeting Federal Specification J-C- 30B. Aluminum SEU cables, when used for dwelling units, they need to be used at the listed ampacities and at 120/240 volts in single phase service. The ampacities are based on NEC section 310-15 of the 2005 edition.

Is there a difference between SEU and SER cables?
Yes, there is a difference between these two wires. Although both are Service Entrance (SE) cables, SER have a reinforcement tape and SEU cables have an overall reinforcement together with neutral tape. SEU cables may be used in applications of 600 volts and under, but SER cable is used in applications of 600 volts. 

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