Main Disconnect Switch Height

Main disconnect switches circuit breakers and molded case switches equipped with door mounted rotary handles and installed in industrial control panels for industrial machinery applications essentially require the use of an additional internally mounted supplementary handle in.

Main disconnect switch height.

Height of main disconnect the power company may have stricter rules regarding the acceptable mounting heights. Since the switchboard height is greater than 6 1 2 feet the minimum working space height required is the switchboard height 7 feet. Typical is 4 to 5 6 to the center of the meter. The 2011 nec clarifies that the branch circuit overcurrent device can serve as the disconnect for appliances if they are not over 300va or 1 8 hp 422 31 a.

Its height is 84 inches 7 feet and the disconnect switch height is 72 inches 6 feet. If the six breaker rule is allowed locally the six switches must be together in. The minimum working space height required for this disconnect switch is 6 1 2 feet see figure 1. No main disconnect switch in electrical panels with six or more breakers.

So it makes sense that the height of your main switch is accessible without having to find a step ladder or chair to reach it. If you were to switch your main switch off then it will disconnect all the electricity to your house or business. Since the top of the panelboard is more than 6 1 2 feet above the floor the minimum working space height required for this panelboard is the height of the panelboard. The minimum working space height required for the disconnect switch is 6 1 2 feet see figure 6.

That s why your main switch shall not be more than 2 meters above a ground floor or platform. More than two main disconnect switches in the main panel are required to turn off the panel presuming this is a main residential panel hosting more than 6 circuits total see next bullet. The last thing you would want to do is look for a ladder in an electrical emergency when you need to switch off your main switch.