This is not difficult when the wire gauge is small but becomes impractical with larger wire gauges and multi parallel conductors. Solid-core CTs require that the phase conductor being measured be disconnected at one end so that it can be passed it through the opening in the CT. For best accuracy, these parts should not be interchanged with other CTs. Note that the ‘C’ shaped body and the removable ‘I’ section of opening style CT are calibrated as a single unit. On CTBL bus bar models, reinstall the nylon screws and tighten them with your fingers. Do Not Use Excessive Force! Instead, re-position or rock the removable portion until the CT closes without excessive force.Īfter a CTS model split-core CT has been reassembled, a nylon cable tie may be secured around the perimeter of the CT to prevent accidental opening. If the CT seems to jam and does not close, the steel core pieces are probably not aligned correctly. When closing the CT, be sure to match up the ends the same way.
The removable section only fits one way, so as it is removed, notice how the steel core pieces fit together. A strong pull is required, especially when the CT is brand new. To open a CTBL model bus bar CT, first remove the thumb-screws that secure the ‘I’ section. To open a CTS model split-core CT, pull the ‘I’ section straight-out of the ‘C’ shaped body. These CTs have two parts, a ‘C’ shaped body and an ‘I’ section which is removed for installation.
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Place the CT around the conductor and squeeze closed until you hear the latch snap closed.ĬTS Series and CTBL Series split-core CT models can be opened for installation around a conductor or bus-bar. Debris will increase the gap, decreasing accuracy. Secure the conductor in the bottom of the CT’s ‘U’ shaped section using a cable tie through the CT’s window and around the conductor.ĬTML Series split-core CTs open by pulling up on the latch.
Place the CT around the conductor and rotate the top back to the closed position until the latch snaps closed.
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Install CTs with the arrow or label ‘This side toward source’ facing towards the breaker feeding the load.Install CTs on the phase conductor that corresponds to the voltage input phase.Unlike ratio CTs with current outputs, these CTs are internally burdened to produce a safe 0.333 Vac output voltage, therefore, shorting blocks are not needed.The use of any other type of CT will result in incorrect power measurements, and may permanently damage the WattNode meter. This type of CT has a built-in burden resistor that produces a safe low voltage output signal. Before attempting to install CTs read the CT Installation Safety page.ĬAUTION! WattNode meters are designed to work only with CTs that have a 0.333 Vac output. SAFETY WARNING! Current transformers (CTs) are typically install in electrical equipment with lethal high voltage levels.
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