This is a great idea it is a LOTO (life on the line) type product and exactly what you want. You can then look at Hubbell or similar for a less expensive male/female plug. You will be aware to have the cord powered down before joining or un-joining it properly.Prevent accidental plug-in of faulty equipment. Use during service and repair. Rotating design for easy installation in confined spaces. Corrosion-resistant Zenex shell. Fits most 220-550 volt plugs. Includes reusable write-on labels. Lockout Padlocks and Tags sold separately.ULINE offers over...www.uline.ca
LOTO is Lock Out Tag Out.
Tagging is an integral part of LOTO and is the law, in the eyes of OSHA.Of course you are correct. The slogan where I worked was lock out tag out life on the line. The OP may want to consider the LOTO lock system on his application along with the tags as it explains who's lock is on the cover and why they don't want to override it. View attachment 24846