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Section 1
Calculate single-phase and three-phase current
Preview
Preview: 1. Definitions, Calculations, Theory, and Plans (7.5%)
Preview includes- 4 of 5 lesson topics
- 1 overview segment
- 3 core concepts
- 2 exam tips
Lesson Topics
- Single-Phase Current Calculation
- Three-Phase Current Calculation
- Unit Identification
- Power Factor Considerations
Overview
This card focuses on calculating current in single-phase and three-phase circuits based on provided power and voltage values. Accurate unit identification and understanding of the formulas are crucial for correct calculations.
Core Concepts
- Single-Phase Current: For resistive loads, current (I) is calculated using the formula: I = P / V, where P is power (in watts) and V is voltage (in volts).
- Three-Phase Current: For balanced three-phase loads, line current (I) is calculated using the formula: I = P / (V * √3), where P is power (in watts), V is line-to-line voltage (in volts), and √3 is the square root of 3.
- Unit Consistency: Always ensure units are consistent before performing calculations.
Exam Tips
- Double-check your calculations for arithmetic errors.
- Ensure the units are correct before submitting your answer.
Section 1 continues in Pro.Unlock Pro to read the full Calculate single-phase and three-phase current lesson plus every remaining Texas Journeyman Electrician Study Guide section.
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Section 2
Size for continuous load
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Section 3
Distinguish service feeder and branch circuit
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Section 4
Distinguish grounded grounding and bonding conductors
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Section 5
Apply listed labeled and identified equipment rules
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Section 6
Calculate voltage drop from circuit conditions
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Section 7
Read a one-line diagram and load schedule
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Section 8
Apply journeyman license scope and supervision
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Section 9
Locate the service disconnect
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Section 10
Apply service-disconnect grouping rules
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Section 11
Bond the grounded conductor at service equipment
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Section 12
Size and connect the grounding electrode conductor
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Section 13
Use all available grounding electrodes
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Section 14
Size service conductors for load
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Section 15
Apply overhead service clearance and support
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Section 16
Protect underground service conductors
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Section 17
Provide dwelling emergency disconnects
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Section 18
Provide required surge protection
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Section 19
Ground a separately derived system
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Section 20
Protect transformer secondary conductors
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Section 21
Size feeder conductors
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Section 22
Calculate feeder neutral load
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Section 23
Protect feeder conductors from overcurrent
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Section 24
Supply a separate building with a feeder
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Section 25
Size branch-circuit conductors and protection
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Section 26
Calculate general lighting load
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Section 27
Apply dwelling small-appliance circuit rules
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Section 28
Apply dwelling laundry circuit rules
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Section 29
Apply dwelling bathroom circuit rules
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Section 30
Apply dwelling receptacle spacing
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Section 31
Provide GFCI protection for required locations
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Section 32
Provide AFCI protection for dwelling areas
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Section 33
Wire a multiwire branch circuit
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Section 34
Match receptacle ratings to branch circuits
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Section 35
Apply terminal temperature limitations
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Section 36
Adjust ampacity for current-carrying conductors
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Section 37
Correct ampacity for ambient temperature
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Section 38
Calculate household range demand
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Section 39
Calculate household dryer load
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Section 40
Select the larger noncoincident heating or cooling load
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Section 41
Size conductors for a fixed appliance
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Section 42
Apply conductor-identification rules
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Section 43
Select copper or aluminum conductor ampacity
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Section 44
Calculate box fill
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Section 45
Calculate raceway fill
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Section 46
Size raceway for conductor pulling
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Section 47
Support nonmetallic-sheathed cable
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Section 48
Use NM cable only in permitted locations
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Section 49
Select conductors for wet locations
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Section 50
Support EMT
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Section 51
Install rigid PVC conduit
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Section 52
Select flexible raceway appropriately
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Section 53
Install metal-clad cable
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Section 54
Use cable tray as a support system
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Section 55
Keep splices and junctions accessible
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Section 56
Use conduit bodies within their markings
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Section 57
Size pull and junction boxes
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Section 58
Protect conductors at raceway entries
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Section 59
Apply underground cover requirements
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Section 60
Protect cables from nails and screws
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Section 61
Firestop penetrations
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Section 62
Install conductors in parallel
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Section 63
Match connector and terminal ratings
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Section 64
Use flexible cords only as permitted
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Section 65
Maintain raceway electrical continuity
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Section 66
Separate systems in boxes and raceways
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Section 67
Install receptacles with correct grounding and polarity
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Section 68
Switch ungrounded conductors
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Section 69
Install luminaires near combustible storage
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Section 70
Provide appliance disconnecting means
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Section 71
Identify panelboard circuits
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Section 72
Apply transformer protection and ventilation
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Section 73
Install generator transfer equipment
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Section 74
Locate HVAC disconnects
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Section 75
Supply electric vehicle equipment
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Section 76
Bond and protect pools and spas
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Section 77
Install electric signs and outline lighting
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Section 78
Install energy-storage equipment
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Section 79
Provide working space around equipment
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Section 80
Size motor branch-circuit conductors
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Section 81
Select motor short-circuit and ground-fault protection
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Section 82
Set motor overload protection
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Section 83
Provide a motor disconnect
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Section 84
Size a feeder for several motors
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Section 85
Size generator conductors and protection
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Section 86
Classify remote-control and signaling circuits
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Section 87
Use a disconnect within sight
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Section 88
Use a lockable disconnecting means
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Section 89
Identify control-circuit conductors and functions
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Section 90
Classify hazardous locations
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Section 91
Select equipment for a classified location
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Section 92
Apply healthcare patient-care wiring rules
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Section 93
Install emergency systems
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Section 94
Distinguish legally required and optional standby systems
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Section 95
Install fire-alarm circuits
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Section 96
Bond communications systems
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Section 97
Apply temporary-wiring rules
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Section 98
Wire marinas and docking facilities
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Section 99
Wire agricultural buildings
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Section 100
Apply data-center electrical rules
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Section 101
Size and protect photovoltaic circuits
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Section 102
Provide PV disconnects rapid shutdown and marking
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Section 103
Interconnect distributed energy resources
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