Untitled Deck Flashcards
What is the minimum burial depth for a 22 kV conductor?
30”
What is the minimum flush burial depth of a 500 volt conductor?
24”
What is the maximum separation for bonding between above ground metallic power and communications apparatus?
6 ft
According to the NESC, fall protection is required for elevations over how many feet?
10
What type of jumper shall be used to bond across a gate?
bonding jumper
How high should grounding conductor guards extend above the ground or platform?
8 ft
What is the minimum total length of metal strips that constitute an acceptably made electrode?
10 ft
In areas with high soil sensitivity or shallow bedrock, what is the minimum total length of buried strips of metal for an acceptably made electrode?
10 ft
What is the minimum thickness for pole butt plates?
1/4”
What is the minimum continuous bare length of copper wire wrap below ground level?
12 ft
What is the minimum size for copper wire wrap?
6 AWG
What is the minimum overhang for insulated communication conductors over roads and parking lots?
15.5 ft
What materials is the supplier or contractor required to provide to the building owner for house fire warning installations?
All materials except drawings that show the interconnection of tandem connected detectors
Where should smoke detectors be mounted on a beam ceiling with beams less than 12” in depth and spacing less than 96”?
bottom of beam
What is the maximum air velocity for a smoke detector?
300 fpm
