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Box fill refers to the maximum number of conductors that can be contained within a wiring enclosure box, as well as the total volume of the components. Determining the allowable number of conductors in a box requires adding up the number of conductors, clamps, support fittings, devices and equipment, and equipment grounding conductors to make sure you’re within the allowable volume.

Three inches is a great thickness for a residential asphalt driveway that sees minimal to moderate traffic from cars, SUVs, and pickup trucks. However, a thicker driveway can better withstand the weight of a heavier vehicle, such as a trailer or a recreational vehicle. If you drive a heavy vehicle on a thin driveway, you risk cracking and damaging it.

Many asphalt companies have experience with tar and chip paving, but not all. The process is unique enough—and not incredibly common enough—that you may have to look around for a tar and chip specialist. However, speaking with a driveway company is a great place to start, especially if they have experience with multiple materials.

If your driveway is cracked, you can repave it with a process called asphalt overlay. Overlay is more cost-effective than a full replacement but is better suited for minor cracks and issues. If you have major cracks or other problems like water pooling, asphalt overlay isn’t your best bet. Plus, paving over a cracked driveway only extends the lifetime by about 10 years, whereas replacing it would start the clock over completely to give you up to 30 years.