| 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.
Typical safe ability of Transformer, Generator and Cable to withstand Isc – short circuit fault current in multiple of its In – rated current, without damage to the equipment.
Arc Flash occurs when insulation or isolation between electrified conductors is breached or can no longer withstand the applied voltage.
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.
Electric Shock is flow of external electric current through human body. RCD must be installed with 30mA sensitivity for protection against Electric Shock.
Circuit Breaker with Short Time withstand Icw capacity are Calassified as Category B (eg. ACB), and without Icw are Category A (eg. MCCB, MCB).
Switchboard ASSEMBLY Base Frame Provides Base support to Assembly structure and evenly pass load onto base concrete foundation.
NFPA 70E establishes the default arc flash boundary at 4 feet for low voltage (< 600V) systems where the total fault exposure is less than
Galvanization is the process of applying Zinc coating on Steel to prevent Corrosion. In Hot dip Galvanization, Fabrication is submerged in Molten Zinc.