What is the maximum permitted number of separated service disconnects consisting of fusible switches that are grouped together?

What is the maximum permitted number of separated service disconnects consisting of fusible switches that are grouped together?

• A. 4
• B. 8
• C. 6
• D. 10

Answer: (C)

The count of service disconnects that are fusible switches grouped together is limited to six. This rule keeps the service equipment layout straightforward and ensures there’s a clearly identifiable and reachable shutdown path. If you need more than six fusible disconnects in one grouping, you’d typically redesign the arrangement to include a single main disconnect or otherwise structure the disconnects so they fit within the allowed count. Four would be under the maximum, so it isn’t the true upper limit; eight and ten exceed the maximum, so they wouldn’t be allowed as grouped fusible disconnects in a single location.

The count of service disconnects that are fusible switches grouped together is limited to six. This rule keeps the service equipment layout straightforward and ensures there’s a clearly identifiable and reachable shutdown path. If you need more than six fusible disconnects in one grouping, you’d typically redesign the arrangement to include a single main disconnect or otherwise structure the disconnects so they fit within the allowed count.

Four would be under the maximum, so it isn’t the true upper limit; eight and ten exceed the maximum, so they wouldn’t be allowed as grouped fusible disconnects in a single location.