5th Test Flashcards
(42 cards)
What are the cheapest type of poles
Wood
What are some non wood poles / structures
Aluminum concrete fiberglass and steel
How do you determine the whole depth used for poles
Is determined by the pole type and soil
Four classes of insulators for poles
Pin post suspension and strain
What are conductors for overhead lines made out of
Stranded or solid aluminum copper steel
What’s another name for a down guy
Anchor
What do grounds protect
Equipment
When would you use underground electrical distribution systems
When ordinance codes require its use or overhead is unsightly
Two types of underground electrical distribution systems
Direct buried and conduit encased in concrete
Where are underground electrical distribution systems used
Industrial areas residential and airfields
Another name for a manhole
Splice chamber or cable vault
What is a riser and what must it go into
Underground connection to overhead via riser goes into pothead
All Ferris hardware used in Pole line construction must be what
Standard line galvanized steel
What is the pitch in a duct system underground
3 in per 100 ft for draining
How to lay ducks
Is began midway between manholes and when ducks May flare out
When does interior wiring begin
Begins where distribution system service connects to building and extends throughout known as service entrance
How often is the NEC published and who publishes it
Every three years by the NFPA
What sub part houses electrical in the 29 CFR
Subpart k
What should portable tools always be plugged into and should have what
Should have a third prong for a ground and should always be plugged into a GFCI
What is the simplest wiring system
Two wire single phase 50 amps or less usually for lighting
What is the most common wiring system
Three wire single phase
110/220 lighting and power
Heating and air conditioning
What are the four types of wiring systems
2 wire single phase
3 wire single phase
3 wire 3 phase
4 wire 4 phase
What are three types of service disconnects
Knife blade
fuse block
breaker which is the most common
Are three types of nmsc
NM insulated conductor non-metallic jacket
Nmc insulated conductor non corrosive jacket
Nms signaling and data non-metallic
