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Descriptive of a piece of electric equipment so constructed that there are no parts which can be touched from the front of the assembly that are at a voltage different from that of the earth.
Article 100—
“Without live parts exposed to a person
on the operating side of the equipment.”

In 1928 Strand Electric introduced "a standard modern switch-board" the "Dead-Front"
http://www.strandarchive.co.uk/control/directoperated/deadfront.html
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