Here is the excerpt from the Safety Pass A2 class regarding lightning.
2020SAFETYPASSA2-LIGHTNING.pdf
Here is the link to Safety Bulletin 38 which specifies a threshold of 6 miles to enact the lightning Emergency Action Plan.
IATSE Local 728
Dedicated to Motion Picture Set Lighting since 1939
Address
IATSE, Local 728
Studio Electrical Lighting Technicians
1001 W. Magnolia Blvd.
Burbank, CA 91506
(818) 954-0728
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Phone
Office:
818-954-0728
800-551-2158
FAX:
818-954-0732
Local 728 Bulletin
The color version of the Local 728 Bulletin is available online.