In a letter dated September 28, 2015, OSHA references 1926.403(b)(2) – Installation and Use. Part of the letter’s answer clearly states that “OSHA will continue to enforce the listing, labeling, or certification requirements as outlined in 29 CFR 1926.403(b)(2) – Installation and use. That provision requires that listed, labeled, or certified (i.e., approved) equipment be used in accordance with the instructions included in the listing, labeling, or certification.”
Thanks for a great article on daisy chaining extension cords. Applies to outlet/power strips as well. Be Safe Steve