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Technical appendix
Measuring categories CAT I to CAT IV
The IEC/EN 61010-1 standard subdivides electric circuits into measuring categories CAT I to CAT IV so that measuring devices ca n be designed for the widely varying installation
and application purposes. The measuring categories indicate in which application areas a measuring device can be safely used. T he protection of a measuring device from a transient
(=short-term, temporary) overvoltage is determined by the specification of the measurement category (overvoltage category) and the working voltage (nominal current to ground)
e.g. CAT IV 600 V, CAT III 1,000 V.
The IEC/EN 61010-1 standard subdivides measuring electric circuits into the following measuring categories:
- CAT I: for measurements on electric circuits that are not directly connected to the mains.
- CAT II: for measurements on electric circuits that are directly connected to the mains.
- CAT III: for measurements in building installations.
- CAT IV: for measurements at the source of the low-voltage installation.
- The specification of the measurement category and the maximum nominal voltage determine the protection of the measuring devic e vis-à-vis transient (temporary) overvoltage.
- Transient (temporary) overvoltages can occur due to a lightening strike in the distribution network or due to the switching o n/off of large loads.
- The following basic principle applies: the higher the measurement category and the higher the nominal voltage, the higher the protection of the measuring device vis-à-vis transient
(temporary) overvoltage.
- Protection against transient (temporary) overvoltage to 8 kV
HSS bi-metal hole saw
ø Soft VA- Cast Brass Alumi-
mm steel steel steel nium
14 550 300 400 790 900
16 530 275 365 730 825
17 500 250 330 665 750
19 460 230 300 600 690
21 425 210 280 560 630
22 390 195 260 520 585
24 370 185 245 495 555
25 350 175 235 470 525
27 325 160 215 435 480
29 300 150 200 400 450
30 285 145 190 380 425
32 275 140 180 360 410
33 260 135 175 345 390
35 250 125 165 330 375
37 240 120 160 315 360
38 230 115 150 300 345
40 220 110 145 290 330
41 210 105 140 280 315
43 205 100 135 270 305
44 195 95 130 260 295
46 190 95 125 250 285
48 180 90 120 240 270
51 170 85 115 230 255
52 165 80 110 220 245
54 160 80 105 210 240
57 150 75 100 200 230
59 145 75 100 195 225
HSS bi-metal hole saw
ø Soft VA- Cast Brass Alumi-
mm steel steel steel nium
60 140 70 95 190 220
64 135 70 90 180 205
65 130 65 85 175 200
6713065 85 170195
7012560 80 160185
7312060 80 160180
76 115 55 75 150 170
79 119 55 70 145 165
83 105 50 70 140 155
86 100 50 65 130 150
89 95 45 65 125 145
92 95 45 60 120 140
95 90 45 60 120 135
98 90 45 60 115 130
102 85 40 55 115 125
105 85 40 55 110 120
108 80 40 55 110 115
111 80 40 50 100 110
114 75 35 50 100 105
121 70 35 45 90 95
127 65 30 40 85 90
140 60 30 35 80 85
146 55 25 35 75 80
152 55 25 35 75 80
Data sheet for LED lamps
Designation Art. no. Output Luminous flux Protection class Light angle Operation Operating timeLuminous colour
LED torches 500.01 11 1530 1 W 100 Lm IP 67 6° 2 x LR06 10 hrs 4,500 K
LED torches 500.02 11 1532 1 W 100 Lm IP 67 6° 2 x LR06 7 hrs 4,500 K
LED torches 500.01-4500F 11 1534 1.2 W 180 Lm IP 64 15 - 75° 3 x AAA 10 hrs 4,500 K
LED head lamp 500.03 11 1536 1 W 100 Lm IP 64 6° 2 Xx AA 10 hrs 4,500 K
LED inspection lamps 600.08G 11 1540 0.15 W 5 Lm IP 67 15° 2 x LR06 150 hrs 5,500 K
LED inspection lamps 500.05G 11 1542 1 W 100 Lm IP 67 6° 2 x LR06 10 hrs 4,500 K
LED workshop lamps 730.10-4500FG 11 1560 1.2 W 180 Lm IP 64 15 - 75° 230V/ 3.5V 4,500 K
LED workshop lamps 700.01-4500G 11 1562 6 W 650 Lm IP 64 25 - 100° 230V/ 24V 4,500 K
Measuring Categories
CAT I to CAT IV
Measuring Categories
CAT I to CAT IV
Valid for measurements on electric circuits
that are not directly connected to the mains
(e.g. specially protected devices)
Valid for measurements on electric circuits
that are not directly connected to the mains
(e.g. specially protected devices)
Valid for measurements on electric circuits that
are directly electrically connected to the low-
voltage mains (e.g. household appliances)
Valid for measurements on electric circuits that
are directly electrically connected to the low-
voltage mains (e.g. household appliances)
Valid for measurements in building installations
Valid for measurements on electric circuits that
are directly electrically connected to the low-
voltage mains (e.g. household appliances)
Valid for measurements at the source of the
low-voltage installation (e.g. counter, main
connection, primary overcurrent protectors)
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Underground cable
Outbuilding
Substation
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