13
CAUTION
In cases where PTs are required, the secondaries should be fused.
Current Input Specifications
Current Transformers
Use CTs that are compliant with the electrical safety code in your region.
1
If the peak anticipated load is considerably less than the rated system
capacity, you can improve accuracy and resolution by selecting a lower
rated CT.
Connector Type Ring or split-ring, or bare wire.
Wire
14 to 12 AWG (2.1mm
2
to 3.3mm
2
)
Inputs I1, I2, I3
Rated Inputs
10 A RMS (+ 20% maximum, 300 V RMS
to ground)
Compliance
Installation category III (Distribution).
Pollution degree 2
Overload 120 A RMS for 1 second, non-recurring
Dielectric Withstand 3000 V RMS, for 1 minute
Starting Current 0.005 A RMS
Burden 0.05 VA (typical) @ 5 A RMS
Compliance
UL3111-1; and IEC 61010-1, Pollution
Degree 2, Overvoltage Category III
Primary CT Rating
Equal to current rating of the power feed
protection device.
1
Secondary CT Burden
Capacity
> 3VA
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