The panel builder who completes the final wiring, configuration, and routine verification before delivery. The 3 Design Verification Methods
: Setting mandatory physical air gaps (clearances) and surface tracking distances (creepage) to prevent electrical arcing based on insulation voltages. iec 61439-1 standard pdf
Covers everything from industrial motor control centers (MCCs) and power distribution boards to residential consumer units. The panel builder who completes the final wiring,
This method allows manufacturers to verify a new panel configuration by structurally comparing it to a similar, stricter reference design that has already passed physical testing. 13 Pillars of Design Verification iec 61439-1 standard pdf
IEC 61439-1 clearly defines and separates the responsibilities of the parties involved in bringing an assembly to market: The Original Manufacturer