The OSHA Regulations 29 CFR 1910.147 state that Tagout devices, including their means of attachment, shall be substantial enough to prevent inadvertent or accidental removal, shall be of a non-reusable type, attachable by hand, self-locking, and non-releasable with a minimum unlocking strength of no less than 50 pounds and shall have the general design and basic characteristics of being at least equivalent to a one-piece, all-environment-tolerant nylon cable tie.