TL;DR
Wire Sizing: Conductor selection based on ampacity, voltage drop, and derating factors per NEC Table 310.16.
Wire Sizing
Definition
Conductor selection based on ampacity, voltage drop, and derating factors per NEC Table 310.16.
Practical Example
Electrical Calculation: Ohms law
Formula: E = I x R
Variables: E (voltage in volts), I (current in amps), R (resistance in ohms)
Example: 120V circuit with 10 ohm load: I = 120/10 = 12A
Related Procedures
Conductor selection based on ampacity, voltage drop, and derating factors per NEC Table 310.16. Core JE exam calculations.
Relevant formula: Ohms law is E = I x R. Variables: E (voltage in volts), I (current in amps), R (resistance in ohms).
Troubleshooting
Troubleshooting issues related to wire sizing:
- Overcrowded box
- Box fill exceeds allowable volume per 314.16, common in renovation work
- Improper grounding
- Bootleg ground (jumping neutral to ground at receptacle) or missing EGC
- No AFCI protection
- Bedrooms and living areas in new construction require AFCI per 210.12
Documentation
Proper documentation of wire sizing follows facility policies and regulatory requirements. All entries must be dated, timed, and signed. Errors are corrected with a single line through the incorrect entry, initialed and dated. Never erase or cover with correction fluid.
Why It Matters
Core JE exam calculations.
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