EXAMPLE ELECTRICAL DESIGN OF A SMALL OFFICE In your packet there is a floor plan of a small building...
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Transcript of EXAMPLE ELECTRICAL DESIGN OF A SMALL OFFICE In your packet there is a floor plan of a small building...
EXAMPLE ELECTRICAL DESIGN OF A SMALL EXAMPLE ELECTRICAL DESIGN OF A SMALL OFFICEOFFICE
In your packet there is a floor plan of a In your packet there is a floor plan of a small building that shows all the electrical small building that shows all the electrical outlets needed for the function of the building.outlets needed for the function of the building.
The following demonstrates the progression The following demonstrates the progression of placing electrical apparatus in the plan, step of placing electrical apparatus in the plan, step by step, until all the necessary devices are by step, until all the necessary devices are distributed and divided into electrical circuits distributed and divided into electrical circuits that comply with the electrical code.that comply with the electrical code.
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39'-8"8'-4"
20'-0
"
40'-0
"
20'-0
"
26'-0
"14
'-0"
20'-0"
68'-0"
FIXTURE ABCDEF
200 watts100100100100100
Circuit A-16A-17A-18A-19
1/ 2 HP 1 pole ex. fan1 HP 2 pole AC blower6 KW 2 pole water htr.26 A 3 pole AC compressor
100 watt exhaust fan
four 300 wattH.I.D. fixturesin parking lot
A
A A A
A
A
D
A-1
A-2
A-3
A-4
A-5 switchat time clock
G
G G
G
A-5to timeclock
E
F B
B B BB
B
BC
C
A A
AA
A AA
AAAA
AA
AA
A
A A
A
A
C
C
B
B
B
BB
A-5to time
E
clock
GG
G G
at time clockA-5 switch
A
A
A-3
A
A
A
A
A-2A
A
A
A
A
A
A-6
A-7
A-8
A-9
A-10A-11
A-12A-13
A-14
A-15
100 watt exhaust fan
26 A 3 pole AC compressor6 KW 2 pole water htr.1 HP 2 pole AC blower1/ 2 HP 1 pole ex. fan
C
FED
FIXTURE AB
100
100100100
200 watts100
A-19A-18A-17A-16Circuit
in parking lotH.I.D. fixturesfour 300 watt
WPgfi
WPgfi
A
A A A
A
A
D
A-1
AA
F
A-4
B
B
A A
A A
A
A
F B
A
A-15
A
A-4
A-6
A-7
B
A-14
B
A A
A A
A-1A-16
A
MA
A-13
A
A
B
C
C
A-8to timeclock
E
A-5
B
B B
A-3
A
A-11
A
G
G
G
G
at time clockA-5 switch
A
A
A-9
A-10
A-2A
AA-12
A
A
A
A
MA-17
A-18ElecPanel "A"
M
A-19
100 watt exhaust fan
26 A 3 pole AC compressor6 KW 2 pole water htr.1 HP 2 pole AC blower1/ 2 HP 1 pole ex. fan
C
FED
FIXTURE AB
100
100100100
200 watts100
A-19A-18A-17A-16Circuit
in parking lotH.I.D. fixturesfour 300 watt
A
A A A
A
A
D
WPgfi
WPgfi
EXAMPLE PROBLEMS involving electrical EXAMPLE PROBLEMS involving electrical connections. connections.
ONE: 120/240 v deltaONE: 120/240 v delta 1. 6 lighting circuits, each with connected load
of 1800 watts, single pole. For each circuit find:
Quantity of wires_________________ Amperage of each circuit__________ Circuit breaker size in amps________ Size of wires (awg)_______________
2. One electric range outlet, 2 pole, with total load of 9,600 watts. Find:
Amperage of circuit_______________ Quantity of wires required__________ Size of wires required_____________ Circuit breaker size in amps________
3. Two pole outlet for water heater with heat element load of 27 amperes. Find:
Amperage of circuit_______________ Quantity of wires required__________ Size of wires required_____________ Circuit breaker size in amps________
4. A single phase 2 pole attic fan motor rated at 2 horsepower. Find:
Amperage of circuit_______________ Size of wires ____________________ Quantity of wires required__________ Circuit breaker size in amps________
PROBLEM TYPE B A commercial building has a 120/240 volt, 3 phase,
delta electrical system with the following outlets:
1. A 3 pole A/C compressor rated at 33 amperes. Find:
Amperage for the circuit___________ Quantity of wires required__________ Size of wires required_____________ Circuit breaker size in amps________ Size of conduit required___________
2. A 2 pole electric heater element with a connected load of 5600 watts. Find:
Amperage for the circuit___________ Quantity of wires required__________ Size of wires required_____________ Circuit breaker size in amps________ Size of conduit required___________
3. If the total load for the electrical panel from all connected circuits amounts to 86,000 watts, find:
Amperage for the panel____________ Quantity of wires required__________ Size of wires required_____________ Circuit breaker size in amps________ Size of conduit required___________ Size of ground wire_______________
END OF DAY 15END OF DAY 15
