Wavecom TNT+, Инструкция по эксплуатации

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Page 7
Technical Information
CLASS 1 (Earthed Appliance) CONSTRUCTION
(Single basic insulated and protectively earthed equipment)
This type of product design provides two safety barriers between all live conductors at
dangerous voltages and the equipment user.
The provision of basic insulation between exposed metal parts and live parts is the first
barrier to provide basic protection against electric shock.
The second safety barrier is by the connection of exposed (accessible) conductive (metal)
parts to the protective earthing conductor (earth wire) in the fixed wiring of the
device/Installation.
The protective earthing terminal of the equipment must be marked with the word "earth" or
the symbol "E" or the symbol for Earth Terminal or Protective
Conductor Terminal.
To perform this test a continuous earth loop must be made between the exposed
conductive material (metal) and the TnT appliance tester. This is done by means of
connecting the earth lead with the crocodile clip/probe attached to a GOOD earth point
(paint & coatings will not provide effective connections) and the DUT (Device Under Test)
plugged into the TnT appliance testers’ DUT socket. [as shown in the above picture]. The
Maximum allowable limit is 1.0
Ω
(ohm).
1