| Impulse withstand voltage Required – KV | Minimum Clearance Required in air – mm |
|---|---|
| Uimp = 0.33 KV | 0.01 mm |
| Uimp = 0.4 KV | 0.02 mm |
| Uimp = 0.5 KV | 0.04 mm |
| Uimp = 0.6 KV | 0.06 mm |
| Uimp = 0.8 KV | 0.1 mm |
| Uimp = 1.2 KV | 0.25 mm |
| Uimp = 1.5 KV | 0.5 mm |
| Uimp = 2 KV | 1 mm |
| Uimp = 2.5 KV | 1.5 mm |
| Uimp = 3 KV | 2 mm |
| Uimp = 4 KV | 3 mm |
| Uimp = 5 KV | 4 mm |
| Uimp = 6 KV | 5.5 mm |
| Uimp = 8 KV | 8 mm |
| Uimp = 10 KV | 11 mm |
| Uimp = 12 KV | 14 mm |
Degree of Burn is the level of depth of Burn effect on the human skin up to bones.
K factor of transformer is its ability to serve the nonlinear loads without temperature rise, Higher the K-factor greater the capacity to withstand harmonic heating effects.
Arc Blast is the supersonic shockwave produced when the uncontrolled Arc vaporizes the metal conductors and expanding Plasma.
Tested Assemblies Varification Tests as per IEC 61439. Verification by TESTING, CALCULATION, DESIGN-RULES for Construction and Performance of ASSEMBLY.
Utilization Categories indicate the type of Load and Duty Cycle of the load basis which selection of Switchgear should be done for the intended application.
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.
Fire Classification basis Material Involved in Fire and Essential Extinguiser Effect required for Fire Suppression.
Internal Arc Protection ensures Personal and ASSEMBLY protection under arcing conditions due to low impedance path, cause of electrical explosion.
Arc flash occurs when electrical current becomes uncontrolled, results in release of energy that ionizes air, releasing enormous heat, light, sound.