Opening the main electrical panel, also known as the breaker box ... You can insert the new cable into any knockout on the top, bottom, or sides of the panel box. Find the least congested area ...

How to fix a missing knockout plug First, determine the size of the missing knockout hole and subtract 3/8" to figure out what size knockout plug you'll need. For example, if you have a 7/8" hole ...

Generally, replacing an electrical panel will cost $521 to $2,096 on average, but it could cost more than $4,000. The total cost varies depending on the size of your home, the type of panel you ...