INSTALLATION SPECIFICATION
Eaton Industries Pty Ltd
August 2010
10 Kent Road, Mascot, NSW 2020, Australia
Page
9
of
13
DOCUMENT# 510091
5. Cable installation
Note: Surge filters require special treatment regarding installation practices, if optimal protection with
safety is desired. Internal cabling should follow the rules below:
Note for TN models only:
•
The TN models use the supply neutral as the main surge return path. For this reason, it should
not be under-sized and should be the same size as, or larger than the phase conductor size.
Composite cables usually use under-sized neutral conductors and are unsuitable for primary
connections to SPDs.
Notes for TT models only:
•
The TT models use a separate “Surge Return earth”, as well as the normal safety earth. The
purpose of the “Surge Return Earth” is to provide a separate earth path for surges, preventing
their conduction into other equipment.
•
The “Surge Return Earth” should be sized the same as the phase conductors, or larger.
•
The “Surge Return Earth” should be connected to the earth block in the supply SWB i.e. at the
same point as the normal safety earth.
•
If remote from the SWB, a local ground rod or system should be employed and connected to the
“Surge Return Earth” only. In this case, the normal safety earthing conductor should still be
connected at the supply point.
Ensure that the correct wiring diagram is followed for each model. Refer to the diagrams on the preceding
pages:
•
Single-phase TN model – Figure 1a
•
Single-phase TT model – Figure 1b
•
3-phase TN model – Figure 2
•
3-phase TT model – Figure 3
If you have any questions, please contact Eaton or your distributor prior to commencing work.
F
Open door.
F
Carefully unplug the door earth cable from lug on door.
F
Remove door.
F
Attach the supplied cable glands to the enclosure. Tighten using appropriate tools.
F
Determine the cable length necessary for installation and, leaving an extra 100mm, cut off any
surplus cable.
F
Feed the cable(s) through the gland to the required depth and tighten gland.
To prevent slippage during termination, place a strong cable tie around the cable, immediately
above and below the cable gland. Remember to remove before commissioning.
F
Strip the cable sheath and form the individual wires roughly into position.
F
With reference to the wire lugs to be applied to the cable, cut each cable to the correct length.
F
In the case of an armoured/shielded input cable, cut the armour/shield back and use a clamp.
If using armoured/shielded cable with an earth clamp, provide a suitable length of 16-25mm
2
cable
to link the earth clamp with the geartray earth stud. Keep length as short as possible (<300mm).
Earth stud torque is 10Nm.
