Firing the blast-1926.909

1926.909(a)
A code of blasting signals equivalent to Table U-1, shall be posted on one or more conspicuous places at the operation, and all employees shall be required to familiarize themselves with the code and conform to it. Danger signs shall be placed at suitable locations.

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TABLE U-1
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WARNING SIGNAL - A 1-minute series of long blasts 5 minutes prior to
blast signal.
BLAST SIGNAL - A series of short blasts 1 minute prior to the shot.
ALL CLEAR SIGNAL - A prolonged blast following the inspection of blast
area.
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