58 Specifications
Electrical
Power Consumption:
The following table shows typical power consumption and power factor
values with all three phases powered at nominal line voltages. The power supply draws
most of the total power consumed, while the measurement circuitry draws 1-10% of the total
(6-96 milliwatts per phase, depending on the model). Due to the design of the power supply,
WattNode meters draw slightly more power at 50 Hz.
Model
Real
Power
(60 Hz)
Real
Power
(50 Hz)
Power
Factor
Rated
VA
(1)
Power
Supply
Range (Vac)
Power
Supply
Terminals
WNC-3Y-208-MB
1.5 W
1.8 W
0.79
4 VA
96 – 138
N
and
Ø
A
WNC-3Y-400-MB
1.6 W
1.8 W
0.73
4 VA
184 – 264
N
and
Ø
A
WNC-3Y-480-MB
1.6 W
2.0 W
0.69
4 VA
222 – 318
N
and
Ø
A
WNC-3Y-600-MB
1.0 W
1.3 W
0.76
4 VA
278 – 399
N
and
Ø
A
WNC-3D-240-MB
1.2 W
1.5 W
0.70
4 VA
166 – 276
Ø
A
and
Ø
B
WNC-3D-400-MB
1.1 W
1.4 W
0.67
3 VA
320 – 460
Ø
A
and
Ø
B
WNC-3D-480-MB
1.2 W
1.6 W
0.70
3 VA
384 – 552
Ø
A
and
Ø
B
Table 13: Power Supply Characteristics
(1)
Note: This is the maximum at 115% of nominal Vac at 50 Hz. This is the same as the value that
appears on the front label of the meter.
Maximum Power Supply Voltage Range:
-20% to +15% of nominal (see table above). For the
WNC-3D-240-MB, this is -20% of 208 Vac (166 Vac) to +15% of 240 Vac (276 Vac).
Operating Frequencies:
50/60 Hz
Measurement Category:
CAT III
Measurement category III is for measurements performed in the building installation. 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 volt-
ages (these ratings also appear on the front label):
Model
CAT III Voltage Rating
WNC-3Y-208-MB
WNC-3D-240-MB
240 Vac
WNC-3Y-400-MB
WNC-3D-400-MB
400 Vac
WNC-3Y-480-MB
WNC-3D-480-MB
480 Vac
WNC-3Y-600-MB
600 Vac
Table 14: 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
Receiver Sensitivity:
±200 mV
Receiver Bus Load:
1/8 unit load (up to 256 WattNode meters per subnet)
Receiver Failsafe Modes:
bus open, bus shorted, bus idle
