According to NEC 501.15, conduit seals are required in Class I Division 1 locations within how many inches of an enclosure containing an arcing device?

• 18 inches of enclosures containing arcing or sparking devices
• 24 inches of enclosures containing arcing or sparking devices
• 36 inches of enclosures containing arcing or sparking devices
• 12 inches of enclosures containing arcing or sparking devices