National Standard for Withdrawal – Configurations of Plugs and Receptacles (Socket-Outlets)

TTS 26 20 506:1980 is obsolete and is being withdrawn. Updated information can be obtained from UL 498, UL Standard for Safety Attachment Plugs and Receptacles.

Parties that may be affected by the proposed withdrawal can submit comments via email to

Closing Date for Comments: Monday 18th October, 2021