![]() Check out NEC section 310.15(B)(2)(a) for more info. This ensures the current-carrying capacity of your conductors stays intact. These handy little gadgets help prevent sagging and deforming of conduits.įor power conduits, maintaining a 3″ separation between them is best practice. When you’re working with two or more conduits, install molded plastic spacers every six feet. That’s why adding expansion fittings on vertical risers is essential, allowing for settling. Plus, these changes happen more slowly underground.ĭrastic temperature shifts can cause conduit damage from expansion and contraction. You might have a 10☏ change underground compared to a whopping 100☏ above ground. Important Note: Temperature fluctuations are usually milder underground. Add expansion fittings on the vertical riser sections, allowing for settling. This segment is most likely to get damaged. Now, a part of your conduit will eventually rise above ground, exposing it to frost. So, if your frost line is 5-feet below ground, install the 1-inch thick insulation at the 4-foot mark. For instance, using 1-inch rigid insulation is equivalent to about one foot of regular soil depth. This helps stop frost from reaching deeper into the soil. Simply place a layer of rigid insulation above your conduit in the dug-out area. ![]() But if you hit a dead-end, don’t worry! I’ve got an awesome trick up my sleeve. If you’re in a seriously cold place, there’s bound to be some advice on the best installation practices. First, consult your local jurisdiction for guidance. However, if your frost depth is 8-feet below ground, installation might not be practical. ![]() Doing this prevents water from freezing inside and guards against damage due to thermal expansion and contraction. In super frosty areas, make sure you install your conduit below the frost depth. Important Note: Control groundwater to prevent the bottom of excavations from softening, and ensure your dewatering systems don’t remove natural soils. ![]()
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