Testboy 20 PLUS, Operating Instructions Manual, Page: 32 / 160

Operation
32 Testboy
®
20 Plus
Definition of measurement categories
Measurement category II: Measurements on circuits directly
connected to low voltage networks electrically via plug. Typical
short-circuit current < 10 kA.
Measurement category III: Measurements within the building in-
stallation (stationary consumer devices with non-plug-in con-
nection, distributor connection, permanently installed equipment
in the distributor). Typical short-circuit current < 50 kA.
Measurement category IV: Measurements at the source of the
low voltage installation (meters, mains connection, primary
overcurrent protection). Typical short-circuit current >> 50 kA.
To establish the measurement category in a combina-
tion of test lead and measuring instrument, the lowest
category, either of the test lead or the measuring in-
strument, always applies
.
Flashlight
Slide the switch on the side of the tester downwards. The high-
performance LED can illuminate for up to 80 hours! The lifespan
of the LED is over 100,000 hours.