14
Measurement Category:
CAT III
Measurement category III is for measurements performed in the building installation or on the
load side of the main service breaker. Examples are measurements on distribution boards,
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, for example,
stationary motors with permanent connection to the fixed installation.
The line voltage measurement terminals on the meter are rated for the following CAT III voltages
(these ratings appear on the front label):
Meter Service Type
CAT III Voltage Rating
3Y-208
3D-240
240 Vac
3Y-400
3D-400
400 Vac
3Y-480
3D-480
480 Vac
3Y-600
600 Vac
Table 6: WattNode CAT III Ratings
Current Transformer Inputs:
Nominal Input Voltage (At CT Rated Current):
0.33333 Vac RMS
Absolute Maximum Input Voltage:
5.0 Vac RMS
Input Impedance at 50/60 Hz:
23 kΩ
5.4 Pulse Outputs
Full-Scale Pulse Frequencies:
Standard (All Models):
4.00 Hz
Custom (Bidirectional):
0.01 Hz to 600 Hz
Custom (Option P3, Option PV, Option DPO):
0.01 Hz to 150 Hz
Absolute Maximum Pulse Output Frequencies:
Standard Models (Bidirectional):
900 Hz
Option P3, Option PV, Option DPO:
200 Hz
Output Waveform:
square-wave, ~50% duty cycle
Option PW:
programmable pulse
ON
(closed or conducting period, 1 to 65535 milliseconds
Opto-isolator Outputs:
Isolation:
5000 Vac RMS
Breakdown Voltage (collector–emitter):
60 V (exceeding this may destroy the outputs)
Maximum Reverse Voltage (emitter-collector):
5 Vdc (exceeding may destroy the outputs)
Maximum Leakage (OFF) Current (collector–emitter):
100 nA
Recommended Load Current (collector–emitter):
1 μA (microamp) to 5 mA (milliamp)
Maximum Load Current:
~8 mA
5.5 Certifications
Safety:
●
UL 61010-1 (3rd Edition)
●
CAN/CSA-C22.2 No. 61010-1-04
●
IEC 61010-1:2010 (3rd Edition)