ASME A17.1-2010
2.22.4.5(c) gas spring-return oil buffers shall be provided with a switch conforming to 2.26.2.22 that shall be actuated if the plunger is not within 13mm (0.5 in.) of the fully extended position. This is the only thing I see about a buffer switch in Section 2.22 Buffers and Bumpers. 2.26.2.22 just refers you back to 2.22.4.5(c). I'm not sure about ASME A.17.1-2007. Looks like you are ok if you have a gravity or spring return oil buffer.