Safety is a primary issue when doing any wiring around home or garden. According to EZ DIY Electricity, eighteen inches of depth are the standard in open areas not covered by concrete or a building of some kind if using PVC as the conduit. Under a concrete slab, like a sidewalk four inches thick, lay the conduit four inches deep. For concrete two inches thick, a depth of twelve inches is required.
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Check Local Codes
Electrical codes vary from state to state and county to county. Check your county building supervisor for the minimum requirements in your area. You will also need to determine where other underground cables are located before you dig. Call 811, in any state, to receive that information.
Line voltage wiring, which is 120 volts (the same as the wiring in your home) should follow the safety guidelines recommended. PVC conduit requires deeper trenches than rigid steel conduit and the depth varies according to the location, such as under a sidewalk or driveway. The best tack is to call your local authorities and follow the guidelines they recommend.
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