Rigging equipment for material handling (slings, chains, hooks) must be:

解析

Rigging equipment must be inspected by a competent person before use on each shift and as necessary during its use, removed from service when damaged or defective, and never loaded past its rated capacity, which has to be legible on the sling itself. What the wrong answers share is that each replaces today's look with a periodic certificate. An annual inspection (a) is a genuine requirement in some rigging regimes and says nothing about the nick the sling took yesterday. Proof testing (c) is done by the manufacturer or after a repair, not before every lift, and is not an alternative to inspection. And a tag (d) records history: what the standard wants on the sling is the identification and rated capacity markings, and what it wants before the lift is an examination.