Ashida ADR111A, Instruction Manual

Page: 38 / 128

Doc ID : ADR111A_IM_01
Ref ID : ADR111A/IM/I&P
Rev No. : 04
Page No. : 38 of 127
ADR111A /
ADR211A
2.3.11 Current Transformers
Current transformers would generally be wired with 2.5 mm2 PVC insulated multi-stranded
copper wire terminated with M4 ring terminals. The wires should be terminated with rings
using 90º rings terminals, with no more than two rings per terminal.
Due to the physical limitations of the ring terminal, the maximum wire size user can use is
4.0 mm2 using ring terminals.
The wire should have a minimum voltage rating of 300 V RMS.
Caution: Current transformer circuits never be fused.
Note 1: Terminal blocks must not be detached whilst current transformer (CT) circuit is live. CT
shorting must be achieved by external means;
Note 2: For 5A CT secondary, we recommend using 2 x 2.5 mm2 PVC insulated multi-stranded
copper wire.
2.3.12 Output Relay Connections
These should be wired with 1 mm PVC insulated multi-stranded copper wire terminated with
M4 ring terminals.
2.3.13 USB Connection (For ADR211A only)
The IED has a type B USB socket on the front panel. A standard USB printer cable (type A
one end, type B at other end) can be used to connect a local PC to the IED. This cable is the
same as that used for connecting a printer to a PC.