EMERSON KJ3243X1-BA1 I/O Bus Terminator

Content introduction

For effective protection, the reverse standoff voltage should be between 200 to 300 percent of nominal line-to-ground voltage of the appropriate ac service lines for a spark gap type surge arrester that is to be installed line to ground. The reverse standoff voltage should also be between 200 to 300 percent of nominal line-to-line voltage of appropriate ac service lines for a spark gap type surge arrester that is to be installed line to line. The reverse standoff voltage for metal oxide varistor (MOV) and zinc oxide non-linear resistor (ZNR) type arresters should be 175 ± 25 percent of the nominal line-to-ground or line-to-line voltages of the appropriate ac service lines. (2) Electrical and electronic equipment at various facilities has been severely damaged by lightninggenerated transients. The transients occur on externally exposed lines that directly interface equipment. Externally exposed lines are outside lines, buried, overhead, etc., that are exposed to weather elements. The lines include incoming ac service conductors, equipment signal, status, control, grounding conductors, and intrafacility ac and dc power lines.

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