
Installing the Equipment
2.5.2 Technical Earth
Caution!
It is strongly recommended that the Technical Earth terminal at the rear panel of the
equipment be connected to a site Technical Earth before any external connections
are made and the equipment is powered. This limits the migration of stray charges.
The Technical Earth provides a suitable connection between the TT1222 and the
installation to give a low impedance path at normal operating frequencies. A terminal
at the rear panel (left of the power socket) is provided to:
1. Ensure all equipment chassis fixed within a rack are at the same technical earth
potential. To do this, connect a wire between the Technical earth terminal and a
suitable point on the rack.
2. Eliminate the migration of stray charges when connecting between equipment.
Figure 2.2: Technical Earth Connector
Note: The technical earth shall be fitted with a bolt of M4 x 6 dimensions,
4 millimetres in diameter, and no longer than 6 millimetres.
Location of the Technical Earth
2.5.3 AC Power Supply Cord
2.5.3.1 General
A mains cord is normally supplied with this product. It is fitted with a moulded plug
suitable either for mainland Europe, the UK, Australia or USA as advised when
ordered.
Note: The TT1222 is not fitted with an AC power supply ON/OFF switch. Ensure
the socket-outlet supplying the equipment is installed near the equipment,
so that it is easily accessible.
When replacing the power cord in the USA, make sure to always replace it with a
cord of the same type. The cord should be of type: Feller type SVT cord rated 3x18
AWG with plug 498 G and appliance coupler C13.
EN/LZT 790 0002/2 R1A
2-8
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