California Code of Regulations
Title 8 - Industrial Relations
Division 1 - Department of Industrial Relations
Chapter 4 - Division of Industrial Safety
Subchapter 4 - Construction Safety Orders
Article 14 - Construction Hoists
Section 1604.10 - Bottom and Top Clearances and Runbys for Cars and Counterweights
Current through Register 2024 Notice Reg. No. 38, September 20, 2024
(a) Bottom Car Clearances.
When the car rests on its fully compressed buffer, there shall be a vertical clearance of not less than 2 feet between the pit area (ground or foundation) and the lowest structural or mechanical part, equipment, or device installed beneath the car platform except guide shoes or rollers, safety-jaw assemblies, and platform aprons, guards, or other equipment located within 12 inches horizontally from the sides of the car platform (See Figure 1).
When the car rests on its fully compressed buffer, no part of the car or any equipment attached thereto shall strike any part of the pit or any part of the equipment located therein.
(b) Bottom Runby for Counterweighted Hoists.
The bottom runby of cars and counterweights shall be not less than 6 inches.
EXCEPTION: Where spring return-type oil buffers are used, the runby may be eliminated so that the buffers are compressed by not more than 25% of their stroke when the car floor is level with the terminal landings.
Rated Speed (feet per minute) |
Runby (inches) |
51 to 200 |
9 |
201 to 600 |
12 |
(c) Bottom Runby for Uncounterweighted Hoists.
The bottom runby of uncounterweighted elevators shall be not less than 6 inches.
(d) Maximum Bottom Runby for Permanent Elevators Used as Hoists.
(e) Top Car Clearances for Counterweighted Hoists.
The top car clearance shall be not less than the sum of the following:
(f) Top Car Clearance for Uncounterweighted Hoists.
The top car clearance shall be not less than 2 feet 6 inches.
(g) Top Counterweight Clearances.
The top counterweight clearance shall be not less than the sum of the following:
Where car spring buffers are used, add one-half the gravity stopping distance based on governor-tripping speed.
(h) Overhead Clearances Where Overhead Beams Are Not Over Car Crosshead.
Where overhead beams or other overhead hoistway construction except sheaves are located vertically over the car, but not over the crosshead, the clearance from the car top to such beams or construction, when the car is level with the top landing, shall be not less than the amount specified in Sections 1604.10(e) and 1604.10(f).
(i) Equipment on Top of Car Striking Overhead Structure.
When the car crosshead, or car top where no crosshead is provided, is at a distance of 2 feet from the nearest obstruction above it, no equipment on top of the car shall strike any part of the overhead structure or the equipment located in the hoistway.
(j) Gravity Stopping Distances.
The following formula gives the value of the stopping distance based on gravity retardation from any initial velocity:
where
V = initial velocity, in feet per minute
S = free fall, in inches (gravity stopping distance)
Figure 2 shows the gravity stopping distances from various initial velocities.
Gravity Stopping Distance in Inches
Fig. 2
Gravity Stopping Distance
1. Change without regulatory effect repealing and adopting new Figure 1 within subsection (a)(1)(A) filed 5-19-2008 pursuant to section 100, title 1, California Code of Regulations (Register 2008, No. 21).