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To install a fieldbus system complying with the IEC 60079-27 specification, the cable must comply with the following parameters:

Loop resistance, Rc: 15 to 150ohms/km

Loop inductance, Lc: 0.4 to 1mH/km

Capacitance, Cc: 80 to 200nF/km

Maximum length of each

trunk cable:

1km in IIC/Groups A-D; 5km in IIB/Groups C, D (Note 1)

Maximum length of each

spur cable: 30m (Note 2)

Note 1: Limited to 1.9km by FF-816

Note 2: Increased to 60m in later revisions of IEC 60079-27