408.56 Minimum Spacings
Where close proximity does not cause excessive heating, parts of the same polarity at switches, enclosed fuses, and so forth shall be permitted to be placed as close together as convenience in handling will allow.
Exception: The distance shall be permitted to be less than that specified in Table 408.56 at circuit breakers and switches and in listed components installed in switchboards, switchgear, and panelboards.
Table 408.56 Minimum Spacings Between Bare Metal Parts
|AC or DC Voltage||Opposite Polarity Where Mounted on the Same Surface||Opposite Polarity Where Held Free in Air||Live Parts to Ground*|
|Not over 125 volts, nominal||19.1||3/4||12.7||1/2||12.7||1/2|
|Not over 250 volts, nominal||31.8||11/4||19.1||3/4||12.7||1/2|
|Not over 1000 volts, nominal||50.8||2||25.4||1||25.4||1|
|*For spacing between live parts and doors of cabinets, the dimensions in 312.11(A) shall apply.|