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Standard
""IEC/EN61010-1:
equipment for measurement, control and laboratory use, Part 1:
General
requirements"
commonly called overvoltage category, is. § 6.7.4: Measured circuits,
reads: circuits are divided into the following measurement
categories:
•
Measurement category IV is for measurements performed at the
source of a low-voltage installation.
Examples are electricity meters and measurements on primary
overcurrent protection devices and ripple control units.
•
Measurement category III is for measurements performed on
installations inside buildings.
Examples are measurements on distribution boards, circuit
breakers, wiring, including cables, bus-bars, junction boxes,
switches, socket-outlets in fixed installation, and equipment for
industrial use and some other equipment, for example, stationary
motors with permanent connection to fixed installation.
•
Measurement category II is for measurements performed on
circuits directly connected to the low-voltage installation.
Examples are measurements on household appliances, portable
tools and similar equipment.
•
Measurement category I is for measurements performed on
circuits not directly connected to MAINS.
Examples are measurements on circuits not derived from MAINS,
and specially protected (internal) MAINS-derived circuits. In the
latter case, transient stresses are variable; for that reason, the
standard requires that the transient withstand capability of the
equipment is made known to the user
2. GENERAL DESCRIPTION
23
Safety
requirements
defines
what
measurement
EQUITEST
for
electrical
category,
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