Skip to Main Content

This information is provided free of charge by the Department of Industrial Relations from its web site at These regulations are for the convenience of the user and no representation or warranty is made that the information is current or accurate. See full disclaimer at
Subchapter 6. Elevator Safety Orders
Article 7. Hoistways, Hoistway Enclosures, and Related Construction for Power Cable-Driven Passenger and Freight Elevators
Return to index
New query

§3015. Machinery and Sheave Beams, Supports, and Foundations.

(a) Beams and Supports Required.

(1) Machines, machinery, and sheaves shall be so supported and maintained in place as to effectually prevent any part from becoming loose or displaced under the conditions imposed in service.

(2) Supporting beams, if used, shall be of steel, reinforced concrete, or, for existing installations, sound timber.

(3) Beams are not required under machines, sheaves, and machinery, or control equipment which are supported on floors, provided such floors are designed and installed to support the load imposed thereon.

(b) Loads on Machinery and Sheave Beams, Floors or Foundations, and Their Supports.

(1) Overhead beams, floors, and their supports shall be designed for the loads specified in Design Section 3111(a)(2).

(2) The foundations, beams, and floors for machinery not located over the hoistway shall be designed to support the loads specified in Design Section 3111(a)(3).

(c) Securing of Machinery and Equipment to Beams, Foundations, or Floors.

(1) Machinery or equipment shall be secured to and supported on or from the top of overhead beams or floors.

EXCEPTIONS to subsection 3015(c)(1):

1. Secondary or deflecting sheaves of traction elevators. If bolts in tension are used to support such sheaves, the bolts shall be provided with lock nuts and shall be cotter-keyed.

2. Rotable overhead sheaves whose members in tension comply with the requirements of Design Section 3101(b)(1)(C).

(2) Machines and sheaves located below or at one side of a hoistway shall be anchored to beams, foundations, or floors with bolts that meet the specifications of Design Section 3111(c)(1).

(A) Where bolts are used through sloping flanges of structural shapes, the boltheads shall be of the tipped or beveled-head type or shall be fitted with beveled steel washers, and nuts on sloping flanges shall seat on beveled steel washers.

(3) The fastenings including vibration isolation units and supporting structures used to attach controllers, motor generators sets, compensating rope sheave assemblies, machines, machine beams, and sheaves to the building shall conform to Section 3111(c)(3).

(d) Overhead Hoisting Rope Hitches. Where hoisting ropes are secured to the structure above a hoistway, the hitch plates and hitch plate blocking beams, where used, shall be secured to and mounted on top of overhead beams, machine beams, or on top of auxiliary beams connected to the webs of overhead beams. Hitch plates, blocking, or auxiliary beams shall be secured with bolting, riveting, or welding and shall be so located that the tensions in the hoisting ropes will not develop direct tensions in the bolts or rivets. The hitch-plate supporting beams and fastenings shall be designed to support the loads as specified in Design Section 3111(c)(2) and 3111(d).

(e) Cast Metals in Tension or Bending. Cast metals which are subject to tension or bending shall not be used to support machinery or equipment from the underside of overhead beams or floors except as allowed in Design Section 3111(e).

(f) Allowable Stresses or Deflections for Machinery and Sheave Beams or Floors and Their Supports. The unit stresses or deflections for all machinery and sheave beams and floors and their supports, based on the loads computed as specified in Design Section 3111(a), shall not exceed those permitted by Design Sections 3111(a) and 3111(b).

(Title 24, Part 7, Section 7-3015.)

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Amendment of subsection (c) filed 9-5-75; effective thirtieth day thereafter (Register 75, No. 36).

2. Section 3015(c) which was filed 9-5-75 (Register 75, No. 36), was approved by the Building Standards Commission 3-26-76. History note printed in Register 78, No. 30 for technical reasons.

3. Amendment of Exception in subsection (c)(3) filed 12-22-78; effective thirtieth day thereafter (Register 79, No. 1).

4. Amendment filed 6-23-87; operative 6-23-87 (Register 87, No. 27).

Go BackGo Back to Article 7 Table of Contents