Hioki CM4002, Instruction Manual

Page: 21 / 104

13
Safety Information
Measurement category II (CAT II)
Applicable to test and measuring circuits connected directly to utilization points (socket outlets and similar
points) of the low-voltage mains installation.
EXAMPLE: Measurements on household appliances, portable tools, and similar equipment, and on the
consumer side only of socket-outlets in the fixed installation.
Measurement category III (CAT III)
Applicable to test and measuring circuits connected to the distribution part of the building’s low-voltage
mains installation.
EXAMPLE: Measurements on distribution boards (including secondary meters), photo voltaic panels,
circuit breakers, wiring, including cables, bus-bars, junction boxes, switches, socket-outlets
in the fixed installation, and equipment for industrial use and some other equipment such as
stationary motors with permanent connection to the fixed installation.
Measurement category IV (CAT IV)
Applicable to test and measuring circuits connected at the source of the building’s low-voltage mains
installation.
EXAMPLE: Measurements on devices installed before the main fuse or circuit breaker in the building
installation.
T
Outlet
CAT II
Internal Wiring
Distribution Panel
Service Entrance
Service Drop
CAT IV
Power Meter
CAT III
Fixed Installation
HIOKI CM4002A961-02