B-6
IEC 417, No. 5017
Earth (ground) terminal - Primarily used for functional earth
terminals which are generally associated with test and
measurement circuits. These terminals are not for safety earthing
purposes but provide an earth reference point.
IEC 417, No. 5019
Protective conductor terminal - This symbol is specifically reserved
for the protective conductor terminal and no other. It is placed at the
equipment earthing point and is mandatory for all grounded
equipment .
IEC 417, No. 5020
Frame or chassis terminal - Used for points other than protective
conductor and functional earth terminals where there is a
connection to accessible conductive terminals to advise the user of
a chassis connection.
I
EC 417, No. 5021
Equipotentiality - Used in applications where it is important to
indicate to the operator that two or more accessible functional earth
terminals or points are equipotential - More for functional rather
than for safety purposes.
IEC 417, No. 5007
On (Supply) - Note that this symbol is a bar, normally applied in the
vertical orientation. It is not the number 1.
IEC 417, No. 5008
Off (Supply) - Note that this symbol is a true circle. It is not the
number 0 or the letter O.
IEC 417, No. 5172
Equipment protected by double insulation or reinforced insulation
(equivalent to Class II if IEC 60536).
