Guide to Range Demand Calculation Questions on NEC Electrical Exams (NEC 220.55)
Range (cooking appliance) demand questions are common on NEC-based licensing exams because they test whether you can apply NEC 220.55 and its table notes...
Grounding Electrode Conductor (GEC) Sizing Questions on NEC Electrical Exams (Table 250.66)
Grounding electrode conductor (GEC) sizing questions are high-frequency on Journeyman exams because they test whether you can correctly use NEC Table 250.66—especially when the...
Neutral Conductor Sizing Questions on NEC Electrical Exams (220.61 Exam Method)
Neutral conductor sizing questions show up on Journeyman licensing exams because they test whether you can identify unbalanced load, apply NEC demand rules, and...
Voltage Drop Calculation Questions on NEC Electrical Exams (Fast Guide + Examples)
Voltage drop questions are common on Journeyman electrician exams because they test one skill: choosing a conductor size that keeps voltage loss within a...
NEC Table 430.250: Full-Load Currents for Three-Phase Motors
This guide covers the application of NEC Table 430.250, which is used to determine the Full-Load Current (FLC) for three-phase alternating-current motors. This FLC...
Ground an Electrical Panel: NEC Requirements
🏠 Ground an Electrical Panel: NEC Requirements
Proper grounding is the non-negotiable foundation of electrical safety. It ensures stability and provides a critical path for...
Grounding & Bonding Separately Derived Systems (SDSs)
🔌 What is a Separately Derived System (SDS)?
An SDS is a system sourced from something other than a service where there is no direct...
Equipment Grounding Conductors (EGC)
What is the EGC?
The Equipment Grounding Conductor (EGC) is the primary safety mechanism of the electrical system.
While the Grounding Electrode Conductor (GEC) connects the...
The 8 Grounding Electrodes: NEC 250.52 Overview
What is a Grounding Electrode?
A grounding electrode is simply a conductive object that establishes a direct connection to the Earth.
The NEC lists 8 specific...
Purpose of Grounding (Article 250 Overview)
NEC Article 250 is arguably the most important section of the Code for safety. Its primary goal is to protect people from electrical shock...
Proper Sizing of Conduits and Raceways. NEC Annex C.
NFPA 731 Section 4.6.3.12(2) clearly states that whenever raceways, conduits, or tubing are used (even for security systems), they must be sized in accordance...
Table 250.66 — Grounding Electrode Conductor Size
NEC Table 250.66 is the standard for determining the size of the Grounding Electrode Conductor (GEC) for alternating-current systems.
Grounding Electrode Conductor for Alternating-Current Systems
Use...
