240.87 Noninstantaneous
Where a circuit breaker is utilized without an instantaneous trip, one of the following or approved equivalent means shall be provided:
[INDENT](1) Zone-selective interlocking
(2) Differential Relaying
(3) Energy-reducing maintenance switching with local status indicator.
[/INDENT]Do you use protective devices without an instantaneous as part of the design and if so, what changes (if any) have you made to comply with this article?
[INDENT]

• We never specify devices without an instantaneous trip.
• Zone selective interlocking
• Differential Relaying
• Maintenance Switch
• Something else (please comment)

[/INDENT]Select all that apply.

We have not had a design with L,S only (no Instantaneous) since the 2011 NEC came out. The next time we do, we will likely specify a maintenance switch. Seems like the simpler approach.