34 Pa. Code § 7.36 – Data plates and numbering.

(a) Metal plates with the permissible load in pounds marked on such plates shall be posted in a conspicuous place in the cars of all elevators.
(b) Metal tags on which are stamped the diameter, stranding, date of installation or renewal, and material of cables, shall be attached to all hoisting and counterweight cables, as required by § § 7.56(i) and 7.280(j) (relating to cables).
(c) When more than one elevator is located in a building, numbers shall be placed upon each for permanent identification.

This section cited in 34 Pa. Code § 7.71 (relating to conflicts); and 34 Pa. Code § 7.291 (relating to general).