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2.4.4 Surge Arrester
To avoid lightning damages to the clock, a gas discharge surge arrester is included with Kronos and must
be installed at the building or cabinet entrance. See also section
Mount the surge arrester using a 'L' shaped bracket and ground it using a cable with a cross
Note:
section of at least 10 AWG (6mm
rise-potential damage.
2.5
IRIG-B Cables
Twisted pair and coax cabling for connecting the IEDs to the clock output cards must be wired as follows:
▪ One main cable.
▪ Short connections to IEDs.
▪ Termination resistor at the end. The terminator should match the impedance of the cable being used
which is typically between 100 and 200 Ohm.
See also the following figure for best installation practices.
2
). Use the same ground point as the clock to avoid ground-
Figure 3: IRIG-B wiring to IEDs
13
Kronos Series 3
Surge
Arrester.
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