Application Notes

Estimating Power for Wye Circuits

EstWyePower.pdf

You've installed a wye WattNode® (WNA-3Y-208, 3Y-400, 3Y-480, or 3Y-600) and you're not sure if the measured power is reasonable. This app note describes a technique for estimating the power consumption of a wye circuit.

Estimating Power for Delta Circuits

EstDeltaPower.pdf

You've installed a delta WattNode (WNA-3D-240 or WNA-3D-480) and you're not sure if the measured power is reasonable. This app note describes a technique for estimating the power consumption of a delta circuit.

Fusing the WattNode

Fusing.pdf

This app note describes when and how to add fuses to your WattNode installation. It even lists recommended suppliers and part numbers.

Pulse WattNode Scale Factors

ScaleFactors.pdf

This is a table of Watt-Hours per Pulse and Pulses per Kilowatt-Hour for all WattNode models and CT sizes (amps).

Using the WattNode with 5 Amp Output CTs

5AmpCTs.pdf

This app note explains the use of the WattNode with 5 amp output current transformers.

Using the WattNode with Potential Transformers

PTs.pdf

With potential transformers (PTs), it is possible to use the WattNode to measure kilovolt circuits. This app note explains using PTs and gives an example for measuring a 4160 VAC circuit.

Measuring Variable Speed Drives and Noisy Loads

VFDs.pdf

Variable speed motor drives and other noisy loads can be difficult to measure. This app note explains techniques to minimize the effects of noise from these loads.

Measuring 230 VAC Circuits

Meas230.pdf

230 VAC circuits arise in many different situations, and each of them needs to be measured differently. This app note describes these situations and provides wiring diagrams.

Using a Three-Phase WattNode to Measure One or Two Phases

SinglePhase3Y208.pdf

This app note explains how to use the 3Y-208 model to measure power and energy on one or two phase circuits with 120VAC from phase-to-neutral voltage.

Using Multiple CTs Per Phase

ParallelCTs.pdf

This app note explains how to wire multiple CTs on a phase into the WattNode. This technique is useful when all conductors for a phase cannot be put into one CT.