What is URD aluminum wire?
What is URD aluminum wire?
Underground residential distribution wire (URD) is a specialty aluminum wire intended for use in residential construction and light to medium duty commercial applications.
Does URD cable need to be in conduit?
URD also called Mobile Home feeder, comes in 3-wire or 4-wire, so it’s an option. It’s legal for direct burial underground, but not for use indoors without conduit as if it was Romex or something.
What is the diameter of 250 aluminum wire?
Specifications: Size AWG: 250 MCM. Stranding: 35. Conductor Diameter Inches: 0.520.
Can URD wire be direct buried?
The cable is rated at 600V for underground secondary distribution not exceeding 90°C. It may be directly buried in earth or installed in duct in both wet or dry locations.
How deep does URD wire need to be buried?
The generally applicable depth is 12 inches, or you can reduce it to 6 inches if you protect the cables with 2 inches of concrete. Under a driveway, you may only need 12 inches of burial depth. Conduits are required for installation in 2 inches of solid rock with concrete.
Can URD cable be installed indoors?
It may be directly buried in earth or installed in duct in both wet or dry locations. Material is constructed with 8000 series compact aluminum conductors and is approved for indoor use per the NEC.
Can you run URD inside?
600V TRI-RATED 8000 SERIES ALUMINUM URD Material is constructed with 8000 series compact aluminum conductors and is approved for indoor use per the NEC.
What size wire is 250 kcmil?
United States Wire Gauges
| Wire Gauge | Typical Amps | THHN Insulated Wire Diameter |
|---|---|---|
| 3/0 AWG | 165-225A | 0.568″ |
| 4/0 AWG | 195-260A | 0.624″ |
| 250 kcmil | 215-290A | 0.678″ |
| 300 kcmil | 240-320A | 0.730″ |
How deep does URD cable have to be buried?
Bury in the Ground: Dig 24 inches There’s one restriction: It needs a conduit where the cable is exposed on the outside of the house and to 18 inches below the ground. Burying the cable 24 inches requires more digging, so this method only makes sense if you have easy-to-dig soil or are renting a trench digger.
Is URD rated for direct burial?
APPLICATION: Quadruplex Aluminum 600V URD cable is designed for use in secondary distribution circuits, where installed in duct or direct burial applications. Maximum operating temperature is not to exceed 90°C in wet and dry locations. Voltage rating is 600 volts.
