3.2.5 MAINS CURRENT TRANSFORMERS
WARNING!: Do not disconnect this plug when the CTs are carrying current.
Disconnection will open circuit the secondary of the C.T.’s and dangerous voltages may then
develop. Always ensure the CTs are not carrying current and the CTs are short circuit
connected before making or breaking connections to the module.
NOTE: The module has a burden of 0.5VA on the CT. Ensure the CT is rated for the
burden of the controller, the cable length being used and any other equipment sharing the CT.
If in doubt, consult your CT supplier.
NOTE: Take care to ensure correct polarity of the CT primary as shown below. If in doubt,
check with the CT supplier.
CT LABELLING
p1, k or K is the primary of the CT that ‘points’ towards the MAINS
p2, l or L is the primary of the CT that ‘points’ towards the LOAD
s1 is the secondary of the CT that connects to the DSE Module’s input for the CT measuring (I1,I2,I3)
s2 is the secondary of the CT that should be commoned with the s2 connections of all the other CTs
and connected to the CT common terminal of the module.
52 CT Secondary for Mains L1
2.5mm²
AWG 13
Connect to s1 secondary of L1 monitoring CT
53 CT Secondary for Mains L2
2.5mm²
AWG 13
Connect to s1 secondary of L2 monitoring CT
54 CT Secondary for Mains L3
2.5mm²
AWG 13
Connect to s1 secondary of L3 monitoring CT
55 DO NOT CONNECT
56
Common for CTs connected to L1,L2,L3
(s2)
2.5mm²
AWG 13
Connect to s2 secondary of L1,L2,L3 monitoring
CTs
labelled as p1,
k
or K
labelled as p2,
l
or L
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