The location of this enclosure prevents the temperature of the
TDS unit(s) from exceeding its maximum specified rating.
Adequate electrical and safety protection is provided by the
enclosure to all exposed terminals.
The location and type of enclosure meets the specified
environmental requirements and prevents the ingress of moisture
and water.
The indicator status of the TDS can be readily inspected.
5. Electrical Connection
When connecting the TDS on the input side of the distribution
panel wiring, it is usual to wire the TDS L-N (L1, L2, L3 to N on 3
phase systems). When connecting the TDS to the output side of
the panel wiring, it is usual to wire it L-PE/PEN.
On TN-C networks, three TDS units are required. L1, L2, L3
should be protected to PEN.
On TN-S networks, four TDS units are required. L1, L2, L3
should be protected to N, and N should be protected to PE.
On TT networks, three TDS units and a SGD unit are required.
L1, L2, L3 should be protected to N using the TDS units, and N
should be protected to PE using the SGD unit.
On IT networks, four TDS units are required. L1, L2, L3, N
should be protected to PE using 440V TDS units on a normal
230V system.
On the TDS1100 series, a “Kelvin” type connection can be
made using separate input and output terminal pairs. This
configuration helps reduce the effects of lead length. The
maximum load current under such a configuration should be
limited to 125A.
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 an RCD is used, it is preferable that the TDS modules be
installed prior to (upstream of) this device to avoid nuisance
tripping which may occur during transient activity.
8. Fusing and Isolation
Overcurrent protection must be installed in the upstream circuit of
every TDS unit if the mains supply is > 100A. This is to provide
protection to the TDS, the load and the wiring in the case of a fault
- ref. 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
TDS 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 TDS.
10. Maintenance and Testing
Before removing a TDS module from service,
ensure that the power has been removed and if
possible “locked out”. Qualified personnel should
only undertake replacement of TDS modules.
Replacement plug-in modules are available.
Note:
It is very important to ensure that the new
module is of the same type and voltage as that
being replaced.
Note:
TDS 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 TDS provides remote status monitoring via
voltage-free contacts. Failure of the TDS is signified
by the N/C contacts (11,14) opening and the N/O
contacts (11,12) closing. Ensure that the voltage
and current ratings of the contacts are not
exceeded.
Note:
The TDS contacts are independent of
whether power is supplied, or not, to the TDS
module. The status of the contacts is given solely
by the failure status of the TDS module.
Table 1. TDS operating specifications
TECHNICAL SUPPORT
www.erico.pentair.com
IPCR1502_A
2 OF 2
INSTRUCTION SHEET
Pentair, CADDY, ERICO CADWELD, ERICO CRITEC, ERICO, ERIFLEX, and LENTON are owned by Pentair or its global affiliates. All other trademarks are
the property of their respective owners. Pentair reserves the right to change specifications without prior notice.
© 2005-2017 Pentair All Rights Reserved
