Download 120 Volt house wiring

Unit 2- Electrical
Components-continued
EET 110 Electronics Survey I
Topic Covered Last Week
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Conductors
Wire Sizes
Lamps
Switches
Topics to cover
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120 vs. 240 Voltage systems
phasing
Recptacles
120 Volt house wiring
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2 wires
– Hot-power
carrying wire
– Neutral-grounded
wire
120 V
240 Volt House wiring
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3 wires
– Two hot-power
carrying
– Neutral-grounded
wire
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Connecting 2
colored together
results in 240
120 V
240V
120 V
Outlet Receptacles
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Duplex outlets
220-240 volt outlets
Outlets
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Permanently wired in structure
Provide the Female (receiving)
terminal
GFCI
Nongrounding Type
Receptacle
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Older type
receptacle
Only to be used
where there is no
grounding system
NEC allows GFCI in
place of
nongrounding
110 V current
Grounded Receptacle
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Provides a
connection for
grounding
conductor (green
hex screw)
Safely bleeds off
current to prevent
shock
110V current
Split Receptacle
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Has a break-off
fin to separate
outlets
Can provide two
separate circuits
One circuit with
½ switched
110V current
No-shock safety duplex
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Self-closing outlets
Prevents children
from inserting
objects
Rotary cap snaps
shut when plug is
removed
110 V system
Weatherproof receptacles
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Outdoor use
Seals moisture out
Self closing or
manual close
New installation
must be GFCI
protected
110 V system
Tandem blades, U-shaped
ground
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Terminal
connections
– Silver- ungrounded
(hot)—240
application only
– Brass- ungrounded
(hot)
– Green- grounded
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Used for
– Air conditioners
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240 V system ONLY
Receptacles for three
wires
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2 Brass terminals
Used for
– Electric dryers
– Electric ranges
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240 V system
Horizontal and vertical
blades and U shaped ground
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Used for
– Large air conditioners
– Heavy power tools
– Garden equipment
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240 V system