Factors affecting Clerance :
Factors affecting Crepage :
Short-Circuit fault allows the current to flow through unintended path with very low impedance, which results into excessive current flow through the path.
An arc flash causes a very loud sound created by quickly-moving air, or a sound wave, that can reach 140 decibels at a distance of
While commissioning Assembly, Switchgear Nameplate gives important information, characteristics, Energy, Short Circuit, Accordingly Safety can be ensured.
Arc Flash is light and heat produced as a result of Arc Fault, due to low impedance path, which causes electrical explosion or discharge.
Temperature rise is defined as the average temperature rise of the ASSEMBLY above the Ambient Air Temperature, with Rated Current load for 8 hours.
Thermal Memory of CB remembers previous fault, till conductor cools – comes to Ambient temperature, if CB is closed before this it will to trip CB faster.
Clearance is the shortest distance in air between two conductive parts. Minimum Clearance required to withstand transient overvoltages as per IEC 61439.
Severity Test for Assembly is Degree of impact a defect has on its operation, under conditions of high humidity combined with cyclic changes in temperature.
Lightning is electrostatic discharge, causing the instantaneous release of energy. SPD diverts surge to ground without impacting utility supply.