Section 43.85. Signal codes

(a) The code of signals used shall be printed and posted. Posting shall be in a conspicuous place near entrances to work places and in other places as may be necessary to bring the code to the attention of all persons affected by it. The printing and posting of the code shall be in a language necessary to be understood by all persons affected by it.

(b) Effective and reliable signaling devices shall be maintained at all times to give instant communication between the bottom and top of the shaft.

(c) The code for all work in compressed air, when the whistle and repeating rap are used, shall be as follows:

(1) One whistle or rap—Hoist.

(2) One whistle, or rap, with a rattle—Hoist slowly.

(3) Two whistles or raps—Come to a stop at once.

(4) Three whistles, or raps, with a rattle—Lower slowly.

(5) Four whistles or raps—Open high pressure.

(6) Four whistles, or raps, with a rattle—Shut off high pressure.

(7) Five whistles or raps—Call person in charge.

(8) Six whistles or raps—Lights are out.

(9) Seven whistles or raps—Lights are all right.

(10) Eight whistles or raps—Emergency call.

(d) The code for the operation of any car, cage or bucket shall be as follows:

(1) One bell—Stop if in motion or hoist if not in motion.

(2) Two bells—Lower.

(3) Three bells—Run slowly and carefully.

(e) In all cases reply signals repeating the original signals shall be made before proceeding.

(f) Additional signals to meet local conditions may be adopted.

(g) The minimum size of type to be used in notices shall be at least 1 inch in height.