6. Wiring
The interconnecting wiring should:
Be as short as possible - not exceeding 300mm (12”).
Avoid sharp bends >100mm radius is recommended.
Have the conductors twisted together where possible.
Terminals will allow connection of 25mm² (#4AWG) multi-
strand wiring or 35mm² (#2AWG) solid - ref. Table 1. The wire
insulation should be stripped back 8mm (5/16").
7. Residual Current Detectors (RCD)
When a Residual Current Device (RCD) or Ground Fault Circuit
Interrupter (GFCI) is used, it is preferable that the DSD modules
be installed prior to (upstream of) this device to avoid nuisance
tripping which may occur during transient activity.
8. Fusing and Isolation
See Table 1 for suitable fuse ratings.
Note:
Operation of this over-current protection under excessive
surge conditions may occur removing protection from the circuit.
The Remote Status contacts should be monitored for this
possibility.
9. Status Indication
Modules incorporate an internal thermal disconnect element,
which automatically disconnects the varistor from the network in
the event of a thermal overload. Should the internal disconnect
operate, a red flag appears in the transparent window of the
Status Indicator(s) on the front of the module.
10. Maintenance and Testing
Before removing a module from service, ensure that the power
has been removed and if possible “locked out”. Qualified
personnel should only undertake replacement of modules.
Replacement plug-in modules are available for sale and the part
number is on the face of the module.
Note:
It is very important to ensure that the new module is of
the same type and voltage as that being replaced.
Note:
DSD units should be inspected periodically, and also
following any periods of lightning or transient voltage activity.
Check the Status Indicator and replace the module if required.
11. Remote Status
The DSD provides remote status monitoring via voltage-free
contacts. Failure of the module(s) is signified by the N/O
contacts (11,14) opening and the N/C contacts (11,12) closing.
Ensure that the voltage and current ratings of the contacts are
not exceeded.
Note:
Depending how the remote contacts are used, loss of
power to the unit may be incorrectly interpreted as a failure of
the module itself. Visual inspection of the Status Indicator
flag(s) is required to clarify this situation.
Table 1. DSD operating specifications
DSD501000DCSP1
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