UL Standards free download UL 498F 2021 pdf download – Plugs, Socket-Outlets and Couplers with Arcuate (Locking Type) Contacts UL 498F 2021 pdf download - Plugs, Socket-Outlets and Couplers with Arcuate (Locking Type) Contacts. 5.3 ATTACHMENT PLUG – A male contact device for the temporary connection of a flexible cord or cable to a receptacle, cord... 02-11 Download Now