Short-Circuit Strength of 11KV MetalClad Switchgear according to WAPDA Specification P-44:96

• The Switchgear, all apparatus and connections shall be so supported and proportioned as to be capable of safely withstanding stresses to which they may be subjected during service including those due to short circuit of 12.5KA or 25KA as required and under the cinematic conditions specified herein.
• Each panels shall be designed  to carry and withstand thermal and mechanical stresses caused by the following rated currents:

•   12.5 KA Panels:

1. Rated normal current  (for main-circuits)                                                400A & 1250A 
2. Rated short-time (1 sec) withstand current (for main & earthing circuits)        12.5KA
3. Rated peak withstand current (for main & earthing circuits)                                 32KA

•   25 KA Panels:

1. Rated normal current  (for main-circuits)                                                630A & 2500A 
2. Rated short-time (1 sec) withstand current (for main & earthing circuits)           25KA
3. Rated peak withstand current (for main & earthing circuits)                                 63KA