Electrical connection Deltabar FMD71, FMD72
28 Endress+Hauser
6.4.3 Cable entries
Explosion protection Cable gland Permitted cable diameter Permitted wire cross-sections
• Standard
• Ex ia
• Ex ic
Plastic M20x1.5 5 to 10 mm (0.2 to 0.39 in) 0.5 to 2.5 mm
2
(20 to 14 AWG)
• Ex tD
• Ex nA
• FM approval
• CSA approval
Metal M20 x 1.5 7 to 10.5 mm (0.28 to 0.41 in)
6.4.4 Overvoltage protection
Standard version
The standard version of the pressure instruments does not contain any special elements to
protect against overvoltage ("wire to ground"). Nevertheless the requirements of the
applicable EMC standard EN 61000-4-5 (testing voltage 1kV EMC wire/ground) are met.
Optional overvoltage protection
Devices showing version "NA" in feature 610 "Accessory Mounted" in the order code are
equipped with overvoltage protection.
• Overvoltage protection:
– Nominal functioning DC voltage: 600 V
– Nominal discharge current: 10 kA
• Surge current check î = 20 kA satisfied as per DIN EN 60079-14: 8/20 μs
• Arrester AC current check I = 10 A satisfied
NOTICE
Device could be destroyed!
‣
Devices with integrated overvoltage protection must be grounded.
6.5 Connection data
6.5.1 Maximum load
In order to guarantee sufficient terminal voltage in two-wire devices, a maximum load
resistance R (including line resistance) must not be exceeded depending on the supply
voltage U
0
of the supply unit.
In the following load diagrams, observe the position of the jumper and the explosion
protection:
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