Section 75 00-02-0522
04-06-11 - 47 -
J10 – Connections from the CT’s
The most accurate method of measuring current will be to connect each wire from each of the
CT’s directly to the controller at J10. The controller offers a low impedance path to neutral
(~.25 Ohms) so the common mode voltage will be well within a safe range.
In applications where the CT’s are commoned together (4 wires - CT1+, CT2 +, CT3+ and
CT common) the system will only read 1/2 of the current signal, unless the iGUARD is
programmed to reflect commoned CT’s.
The iGUARD supports both, full differential CT inputs (both wires from each CT brought back
to the EMB) and “commoned” CTs (where the high sides are brought back individually but
the low sides are all connected together). See the following illustration of current input
construction.
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