Some panelboards are provided with a door covering the breaker switch handles, but all are constructed with a dead front; that is to say the front of the enclosure (whether it has a door or not) prevents the operator of the circuit breakers from contacting live electrical. Some panelboards are provided with a door covering the breaker switch handles, but all are constructed with a dead front; that is to say the front of the enclosure (whether it has a door or not) prevents the operator of the circuit breakers from contacting live electrical. If you've ever found yourself scratching your head over whether that metal door on your distribution cabinet really needs a grounding wire, you're not alone. In factories, construction sites, and even commercial buildings, this question pops up all the time. Your boss might insist on it, while your. A distribution box is the heart of any electrical system. However, the key to. Electrical panel boxes, aka breaker boxes, can be on a wall in an out-of-the-way area of your home. A distribution box, also known as a. It met all my needs, flush mount, indoor, 6 spaces, except it doesn't have a door. I would like a door, so I went delving into the SquareD part number structure and determined I needed a number with F and D in it to get me a flush panel with a door. He stated that it had been approved from his insurance company for several years but now someone else has taken over that insurance company and they canceled his policy. I advised he may need to consolidate into.