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Concrete trowel handle shutoff after release

Summary A manufacturer asked whether its safety switch met the construction rule for power concrete trowels. OSHA said the rule aimed to stop handle rotation after an operator let go. A centrifugal switch that stopped the handle within one revolution appeared to comply.
Document
Federal opinion letter
Agency
Occupational Safety and Health Administration (OSHA)
Document number
1986-07-29
Date issued
July 29, 1986
Status
Active
Status last verified October 10, 2026

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July 29, 1986
Mr. George Barley
Project Engineer
Stow Manufacturing Company
[Recipient address omitted]
Dear Mr. Barley:
This is in response to your correspondence of July 25, requesting clarification of the requirements of [29 CFR 1926.702(c)].
The intent of [29 CFR 1926.702(c)] is to prevent rotation of the trowel machine handle, after release of the operator's hands from equipment handles. A centrifugal safety switch which precludes the concrete trowel machine from rotating less than a revolution of the handle after release appears to comply with the requirements of the above mentioned standard.
If we may be of further assistance, please feel free to call or write.
Sincerely,
John B. Miles, Jr., Director
Directorate of Field Operations
[Corrected 05/28/2004]

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