Clearances and Fastener Requirements

Service entrance cable should be secured:

Within 12 inches of the masthead
At intervals not to exceed 30 inches

Service drops required building clearances:

18 feet over public roadways
15 feet over alleys
12 feet over private driveways
10 feet over finish grade and sidewalks
10 feet over platforms, decks, and porches
8 feet over roofs with less than a 4 in 12 pitch
8 feet over flat roofs
3 feet over roofs with more than a 4 in 12 pitch
3 feet horizontally from fire escapes, porches and decks
3 feet from windows
18 inches over roofs where there is a 4 foot or less overhang

Clearances in closets for light fixtures:

18 inches between fixtures and where combustibles may be stored
6 inches between flush mounted fixtures and where combustibles may be stored

Recessed lighting (typically inspected from the attic):

One half inch spacing of recessed portion of the fixture from combustible materials
3 inch spacing of thermal insulation between recessed light fixtures and combustible materials with nothing above the fixture (Non-thermally protected)

Special appliances (such as laundry equipment):

6 feet maximum distance from outlet to appliance

Supply cords for air conditioners:

10 feet maximum for 120 volt wire
6 feet maximum for 208/240 volt wire