Safety
Operating Instructions ET-xx8 / MT-xx8
R. STAHL HMI Systems GmbH / OI_ET_MT-xx8_en_V_01_02_03.docx / 10.03.2021
Page 17 of 84
3.4
Special conditions of use
The intrinsically safe circuits are earthed.
Equipotential bonding is required for the entire
intrinsically safe circuits.
Devices with wireless interface
Type feature for devices with wireless interface:
W02,
W05
,
W22, W55 or W25
Maximum transmission power of antenna
2
W (group IIC)
Connection terminal for antenna:
X36 and X37
The maximum transmission power is the result of: antenna gain, power loss in the cable and
transmission power of the transmitter (X36 / X37), according to the data in these operating
instructions.
The intrinsically safe circuits at terminals X36 and X37 are earthed. When connecting external
antennae, please note the following earthing requirements for intrinsically safe circuits:
EN 60079-14 of the National Electrical Code ANSI/NFPA 70
Canadian Electric Code CSA C22.1
Requirements for plug connectors and switches
The covers of the terminal boxes are fitted with cable entries and blind plugs. As an option, they
may be fitted with plug connectors and switches.
The devices must be certified individually for the respective type of protection and also have IP66.
Panel mount with xx8 Mounting-Kit
The devices can be mounted inside an enclosure with a suitable cut-out with the aid of fixing
frame kits (xx8 Mounting-Kit). Where degree of protection Ex e, Ex p or Ex tb is required, the
device must
be mounted with a xx8 Mounting-Kit mounting frame (see chapter
