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WCB Standards
WCB Standard: G609 Mobile Equipment Roof Structures - Light Duty, March 1990
© Workers' Compensation Board of British Columbia. All rights reserved. No part of this document may be copied, reproduced, or distributed for profit or other commercial enterprise, nor may any part be incorporated into any other publication, without written permission of the Workers' Compensation Board of B.C.
1. General
1.1. Scope
This Standard pertains to mobile industrial equipment exposed to hazards from
falling objects such as bricks, concrete blocks, and hand tools that may fall
from relatively low heights encountered in operations such as highway maintenance
or landscaping and other services on construction sites.
1.2. Purpose
This standard is intended to describe the minimum requirement for the design
and selection of plates for roof construction.
2. Design Criteria
2.1. Option One - Testing Method
The roof shall be designed to the Minimum Performance Criteria for Falling Object
Protective Structure (FOPS) for Industrial Equipment - SAE J1043.
2.2. Option Two - Minimum Recommended Size
The roof shall be designed in accordance with the minimum recommended size as
outlined in §4.0.
3. Design Requirements
3.1.
The roof plate shall be designed in accordance with the design criteria as outlined
in §2.0.
3.2.
All frame members and supports of the Cab Protective Structure shall be designed
to resist the applied load. Equipment covered by SAE J1040 shall be designed
in accordance with SAE J1040 or its equivalent.
3.3. Weldments
Weldments shall conform to applicable sections of General Specifications for
welding of Steel Structures, CSA W59.1-1970 (or latest revision thereof) and
shall be performed by licensed welders only.
4. Minimum Recommended Sizes
Minimum thickness of roof plate shall be 10 ga, equivalent to 3.4 mm (0.1345 in).
The above is designed on the assumption that stiffeners will be used to limit the unstiffened areas not to exceed 7740 cm2 (1200 in2).
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