What Is a Dead Front Plug
The Face of a Dead Front Plug Is Either Factory Sealed, Secured with Screws, or Openable Only from the Back, So That There Is No Possiblity of Exposing Live...
The face of a dead front plug is either factory sealed, secured with screws, or openable only from the back, so that there is no possiblity of exposing live wires behind the plug prongs. … It is an old-style plug and they have not been legal for sale in the US for many years.
Should an open front plug be replaced with a dead front plug?
Replace open front plugs with dead front plugs. Dead front plugs are sealed and present less danger of shock or short circuit. Do not use light duty extension cords in a non-residential situation. Do not carry or lift up electrical equipment by the power cord.
Must Read
What is a dead front device?
Per the Article 100 definition, electrical equipment is considered to be “dead front” when there are no live parts exposed to a person on the operating side of the equipment. In your case, there were exposed energized parts as you installed conductors.