International Electrical Symbols; Definition Of Measurement Categories - AEMC PMR-1 Manual De Instrucciones

1.1

International Electrical Symbols

Signifies that the instrument is protected by double or rein-
forced insulation.
This symbol on the instrument indicates a WARNING and that the
operator must refer to the user manual for instructions before
operating the instrument. In this manual, the symbol preceding
instructions indicates that if the instructions are not followed,
bodily injury, installation/sample and/or product damage may
result.
Risk of electric shock. The voltage at the parts marked with this
symbol may be dangerous.
In conformity with WEEE 2002/96/EC
1.2

Definition of Measurement Categories

Cat. I: For measurements on circuits not directly connected to
the AC supply wall outlet such as protected secondaries,
signal level, and limited energy circuits.
Cat. II: For measurements performed on circuits directly con-
nected to the electrical distribution system. Examples
are measurements on household appliances or portable
tools.
Cat. III: For measurements performed in the building installation
at the distribution level such as on hardwired equipment in
fixed installation and circuit breakers.
Cat. IV: For measurements performed at the primary electrical
supply (<1000V) such as on primary overcurrent protec-
tion devices, ripple control units, or meters.
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Phase & Motor Rotation Tester Model PMR-1