How Deep Do I Bury UF Cable To My Post Light?
March 26, 2006
Q: I’m installing a new post light at the end of my driveway. The trench will be a straight shot from my house down the driveway (approximately 40′) to the post light. What is the minimum burial depth for the UF? Is it necessary to ground the metal post?
A: The answer is found in Table 300.5 and is based on a number of variables. Let’s look at them. The maximum UF cable burial depth is 24 inches and applies where the cable is run under streets, highways, roads, alleys, driveways and parking lots. For one and two family dwelling driveways and parking areas used for dwelling related purposes, the maximum burial depth is reduced to 18 inches.
Residential branch circuits rated 120 volts or less with GFCI protection and overcurrent protection not exceeding 20 amperes qualify for a burial depth of only 12 inches, which applies where installed under dwelling driveways and outdoor parking areas associated with one and two family dwellings.
Part (B) of 300.5 requires grounding and bonding of underground installations. The equipment-grounding conductor in the UF cable must be connected to the metal pole supporting the luminaire (lighting fixture). This conductor must comply with 250.118 and be sized according to Table 250.122.
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