CCPIA Videos - Certified Commercial Property Inspectors Association

About this video:

The main service disconnect is a means for disconnecting the building from the utility supply. This is typically in the form of a breaker or lever depending on the piece of equipment. The main service equipment should always have a main service disconnect. The ComSOP inspection requirements are:

  • Inspect the means for disconnecting the service main.
  • Determine the rating of the service disconnect amperage, if labeled.

Each piece of main service equipment must have a permanent sign indicating its point of disconnect. Additionally, there should be a visual indicator to determine whether it is in the “on” or “off” position. The main service disconnect is typically distinct and not visually integrated or interconnected with other elements. Any instances where signs or labeling are absent at the main service disconnect should be reported. The inspector should locate the amperage rating of the service disconnect on a label affixed to the main service disconnect and document it in the inspection report.

How Many Main Service Disconnects Should Be Present?

In most cases, a building will have one main service disconnect. However, there could be up to six main service disconnects per main service. These may include up to six switches or circuit breakers, each clearly labeled and specifying the load they serve. These disconnects can be mounted in a single enclosure or a group of separate enclosures. When used together, these components completely shut off power to a building.

Note that a building may have more than one main service. This is common for buildings that require different service sizes or if the building requires a service amperage of 2,000 or greater. There are also other exceptions. There are additional exceptions. The key takeaway is that inspectors should be aware that there may be multiple services in a building, and each main service can potentially have up to six main service disconnects.


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