ADR141A /
Ref ID : ADR241A/IM/I&P
Rev No. : 02
Page No. : 38 of 150
Note: To prevent any possibility of electrolytic action between brass or copper ground conductors
and the rear panel of the product, precautions should be taken to isolate them from one
another. This could be achieved in several ways, including placing a nickel-plated or
insulating washer between the conductor and the product case, or using tinned ring
terminals.
2.3.10 Current Transformers
Current transformers would generally be wired with 2.5 mm
2
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 mm
2
using ring terminals.
The wire should have a minimum voltage rating of 300 V RMS.
Caution: Current transformer circuits must 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 mm
2
PVC insulated multi-stranded
copper wire.
2.3.11 Output Relay Connections
These should be wired with 1 mm PVC insulated multi-stranded copper wire terminated with
M4 ring terminals.
2.3.12 USB Connection (for ADR241A)
The IED has a type B USB socket on the front panel. A standard USB printer cable (type A
one end, type B at the 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.
To Next Page
Loading...
