PETS-2 Crossing Telephone System
QUICKFIX INSTALLATION HANDBOOK
Page 23
of 40
Issue 2
13/12/99
23
The lower left hand M6 hexagonal bolt is to be used for earthing the case. An earth label is
fixed to the case at the side of this bolt. This bolt was fitted with a crinkle washer, and this
washer is essential for integrity of the earth connection.
At this stage it is important to determine the system earthing policy. The case earth is
intended for the safety of the user and must be connected to the same earth point as the
surrounding electrical equipment. This will generally be the same point as the
telecommunications earth point within the Junction Box, and the green /yellow wire along
with the earth bond connection will be made together. In some instances, the case may be
fixed to a signalling frame and the integrity of earthing on the frame must not be affected.
Under these circumstances the PETS 2 unit (case) will be bonded to the local safety earth
of the signalling equipment, and telecommunications earth will be kept isolated.
The hexagonal bolt and
ring terminal are fitted
with the following items
and order:
M6 bolt - split washer -
plain washer - ring
terminal - crinkle washer
- case
The green/ yellow wire
is to be threaded
through the Connector
retention bracket and
then into the trunking.
In most applications the
green/ yellow wire will be terminated to the earth point in the Junction Box.
The ‘Telecommunications Earth’ inside the Junction Box will be terminated to an
appropriate earth point in accordance with normal telecommunications practise.
5.6 Configuration
This handbook will not describe the various configurations that are possible; in this section
the factory set configuration will be described. Any changes to configuration should be
detailed in the Installation Method Statement to be provided by the System design
Authority. Both units are factory configured to the most common applications, factory set
configurations are summarised over: