IEC 60439-1  มอก. 1436-2540   Distinctive Features : • Uniform busbar arrangement in top part    of cubicle or rear side of cubicle • Strict separation of switchboard cable    termination and busbar compartments • Interpanel busbar barriers as standard feature • Pressure-relief flap • High-grade steel enclosure • Switchboard compartment up to 25 modules   (Draw-out type) • Modular design of subsections • Largely-dimensioned cable termination   compartment • Single-front or double-front arrangement as   per request • Free-standing or against-the-wall installation •Standard Design   Application :          The switchboard is designed to handle any switching,   protection, isolating,distribution and control functions. It is   used in all cases where emphasis is placed on a high   degree of availability in operation and extra protection   of personnel and plant.   Standard and Regulations :   IEC 60 439-1 : 1999   BS EN 60439   TIS 1436-2540