TL;DR
Current (Amperage): Flow of electrical charge through a conductor, measured in amperes (A).
Current (Amperage)
Definition
Flow of electrical charge through a conductor, measured in amperes (A).
Assessment Techniques
Flow of electrical charge through a conductor, measured in amperes (A). Current calculations and conductor sizing tested on IBEW, JE, and ME exams.
Relevant formula: Power (3-phase) is P = 1.732 x E x I x PF. Variables: P (watts), E (line voltage), I (line current), PF (power factor).
Exam Focus Areas
On the Ibew Apprenticeship, Journeyman Electrician, Master Electrician exam(s), questions about current (amperage) typically test:
- NEC code references and their correct application
- Safety procedures including LOTO, arc flash, and approach boundaries
- Conductor sizing, overcurrent protection, and grounding requirements
Related Procedures
Flow of electrical charge through a conductor, measured in amperes (A). Current calculations and conductor sizing tested on IBEW, JE, and ME exams.
Relevant formula: Power (3-phase) is P = 1.732 x E x I x PF. Variables: P (watts), E (line voltage), I (line current), PF (power factor).
Troubleshooting
Troubleshooting issues related to current (amperage):
- Wrong breaker size
- Using 20A breaker on 14AWG circuit (max 15A per 240.4(D))
- No AFCI protection
- Bedrooms and living areas in new construction require AFCI per 210.12
- Missing GFCI
- Bathroom, kitchen, garage, outdoor, and crawl space receptacles require GFCI per 210.8
Practical Example
Electrical Calculation: Power (3-phase)
Formula: P = 1.732 x E x I x PF
Variables: P (watts), E (line voltage), I (line current), PF (power factor)
Example: 480V x 20A x 0.85 x 1.732 = 14,117W
Why It Matters
Current calculations and conductor sizing tested on IBEW, JE, and ME exams.
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