Class A, Class N, and Class X circuits should be separated in horizontal runs by at least how many inches?

Class A, Class N, and Class X circuits should be separated in horizontal runs by at least how many inches?

• A. 24 inches
• B. 36 inches
• C. 48 inches
• D. 60 inches

Answer: (C)

Keep different circuit classes physically apart in horizontal runs to minimize interference and the chance that a fault, heat, or arcing in one circuit affects the others. The standard minimum is four feet (48 inches) of separation, which provides a practical buffer to prevent coupling and makes maintenance easier by clearly segregating the wiring. Distances smaller than this—like 24 or 36 inches—do not adequately reduce interference and risk cross-talk between circuits, while 60 inches is more separation than usually required for this purpose.

Keep different circuit classes physically apart in horizontal runs to minimize interference and the chance that a fault, heat, or arcing in one circuit affects the others. The standard minimum is four feet (48 inches) of separation, which provides a practical buffer to prevent coupling and makes maintenance easier by clearly segregating the wiring. Distances smaller than this—like 24 or 36 inches—do not adequately reduce interference and risk cross-talk between circuits, while 60 inches is more separation than usually required for this purpose.