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7 Explanation of symbols
The following symbols appear on the product/device or in the text:
This symbol warns of hazards that can lead to injury.
This symbol warns of a dangerous voltage which can lead to injuries due to electric
shock.
Protection class 2 (double or reinforced insulation, protective insulation)
Measurement Category I: For measuring circuits of electrical and electronic equip-
ment that is not directly supplied with a mains voltage (e.g. battery-operated de-
CAT I
vices, safety extra-low voltage systems, signal/control voltages, etc.)
Measurement Category II: For measuring circuits of electrical and electronic equip-
ment that is directly supplied with a mains voltage via a mains plug. This category
CAT II
also includes all lower categories (e.g. CAT I for measuring signal and control volt-
ages).
Measurement Category III: For measuring circuits of installations in buildings (e.g.
mains sockets or sub-distributions). This category also includes all lower categories
(e.g. CAT II for measuring electrical devices). Measuring in CAT III is only permitted
CAT III
with test prods with a maximum free contact length of 4 mm or with cover caps
over the test prods.
Measurement Category IV: For measuring at the origin of a low-voltage installation
(e.g. mains distribution, electricity provider's transfer points to homes) and outdoors
(e.g. when conducting tasks on underground cables or overhead lines). This cat-
CAT IV
egory also includes all lower categories. Measuring in CAT IV is only permitted with
test prods with a maximum free contact length of 4 mm or with cover caps over
the test prods.
Earth potential
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