Trades Exam Prep

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to calculate balanced three-phase apparent power using square root of three times line volts times line amps - The mathematical relationship between apparent power in volt-amperes and real power in watts using power factor - A step-by-step 208V and 10A calculation example producing 3603 VA and 2882 W at 0.8 power factor - P...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to calculate base single-phase current by dividing volt-amperes by line voltage. - The distinction between volt-amperes as apparent power and watts as real active power. - Why fixed electric space heating is calculated as a continuous load requiring a 125 percent multiplier. - Why a 25-ampere overcurrent device under Article 240.6(A) a...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: * Distinguishing separately derived from non-separately derived generator systems based on neutral switching under the 2023 NEC. * Identifying listing requirements and safety functions of transfer equipment to prevent unintended backfeed. * Understanding NEC Article 690 for solar photovoltaic arrays, Article 705 for interconnections, and Article 706 for energy storage systems. * Avoiding common grounding traps related to neutral-to-frame bonds i...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How Chapters 5, 6, and 7 of the 2023 NEC modify or supplement general rules where applicable. - The distinction between Class and Division hazardous location concepts and the Zone system. - How Article 680 distinguishes equipotential bonding from standard equipment grounding. - Why specified pool bonding elements require a minimum 8 AWG solid copper conductor. - A...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How voltage and current share an inverse relationship in ideal step-down transformers at constant volt-amperes. - Why a 240V to 120V step-down transformer doubles secondary current at the same volt-ampere rating. - How to avoid the common trap of sizing secondary conductors based on primary current. - Standard grounding rules governing s...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • Why motor overload protection and short-circuit protection require separate calculations under NEC Article 430. • How starting inrush current differs from continuous running current and sustained mechanical overloads. • When standard 125% or 115% overload initial sizing rules apply based on motor service factor and temperature rise. • Why high short-circuit breaker settings never permit undersized branch-circuit conductors. • How to corr...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - When to use NEC Article 430 full-load current tables versus motor nameplate ratings under the 2023 NEC. - How section 430.6(A)(1) uses table values to size branch-circuit conductors and short-circuit protection for standard AC motors. - Why section 430.6(A)(2) requires using motor nameplate full-load current to determine overload protection. - Specific exceptions where n...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • The technical distinction between complete luminaires and individual lampholders under the 2023 NEC. • Requirements for installing luminaires in wet locations versus damp locations. • How to calculate general lighting loads using required unit loads rather than actual connected wattage. • Common calculation traps involving high-efficiency LED lighting in commercial occupancies. • A practical decision rule for separating...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • How 2023 NEC Section 110.3(B) mandates compliance with equipment listing and labeling instructions. • General requirements for grounding-type receptacles and device rating rules under Article 406. • Permitted code options for replacing non-grounding two-prong receptacles on ungrounded branch circuits. • Why installing a GFCI receptacle on a two-wire circuit provides personnel protection but does not create an equipment...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • How National Electrical Code Chapter 9 Table 1 limits raceway fill percentages based on conductor count. • Why wire insulation types affect total conductor cross-sectional area in Chapter 9 Table 5. • The distinction between geometric conduit fill limits and electrical ampacity adjustment factors. • How to apply Note 4 sixty percent fill rules for conduit nipples twenty-four inches or less. • A...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • Volume allowance values per conductor size according to 2023 NEC Table 314.16(B) • How to count internal cable clamps and single or multi-gang device yokes • The 2020 and 2023 NEC equipment grounding conductor volume rule for up to four grounds and additional grounds • Step-by-step calculation for an exact 32.0625 cubic inch required box volume and why rounding down is p...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The distinction between dry, damp, and wet locations under the 2023 NEC - Why Section 300.5(B) classifies the interior of all underground raceways as wet locations - How to separate raceway physical protection from conductor insulation moisture ratings - Why Type NM-B cable is prohibited inside underground conduit and which wet-rated alternatives t...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • Minimum required dwelling unit branch circuits including small-appliance, laundry, and bathroom circuits under the 2023 NEC • How small-appliance circuit rules prohibit general outlets while allowing specific code exceptions • The single-bathroom branch circuit exception permitting additional equipment on that individual circuit • General wall-space receptacle spacing rules, including continuous measurement around corners and floor-line wall breaks •...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: * The distinct safety hazards addressed by GFCI personnel shock protection versus AFCI arcing-fire protection. * Why Class A GFCI devices sense conductor current imbalance across 4 to 6 mA thresholds without needing an equipment grounding conductor. * How AFCI protection identifies hazardous arcing waveforms without replacing standard overcurrent and overload protection. * Why code edition and occupancy t...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: * Explain how overloads, short circuits, and ground faults relate to overcurrent under the 2023 NEC. * Identify standard fuse and circuit-breaker ampere ratings listed in NEC Section 240.6(A). * Apply the three conditions required to use the next-size-up overcurrent rule in NEC 240.4(B). * Distinguish feeder conductors from multioutlet branch circuit conductors when applying rounding rules. * I...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • How ambient temperature correction factors adjust allowable conductor ampacity relative to standard table baselines under the 2023 NEC. • When bundling multiple conductors triggers current-carrying adjustment factors in a raceway. • Which conductors count toward raceway adjustment totals and why equipment grounds are excluded. • How neutral conductor qualification rules apply under Section 310.15(E) for linear, non-linea...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • The distinction between conductor insulation ratings and equipment termination temperature limits under 2023 NEC 110.14(C). • Default terminal temperature rating rules for circuits rated 100 amperes or less versus circuits over 100 amperes. • Why 90°C conductor insulation does not automatically permit using 90°C column ampacity for final equipment terminations. • How to use 90°C insulation ratings as the baseline...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: * How the 2023 NEC Article 100 defines a continuous load based on three hours or more of maximum current operation. * The basic continuous load calculation formula requiring 125 percent of continuous loads plus 100 percent of noncontinuous loads. * When listed 100-percent-rated overcurrent assemblies permit sizing conductors at 100 percent of total continuous and noncontinuous loads. * Why load c...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How Article 100 of the 2023 NEC defines the operational boundary between feeders and branch circuits. - The critical role of the final overcurrent protective device in identifying circuit classifications. - Why physical conductor properties like THHN or wire gauge do not determine circuit role. - How to analyze a panel-to-subpanel system scenario t...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Role and location rules for service disconnecting means versus service overcurrent protection - Qualifying grounding electrodes required to be bonded into a grounding electrode system under 2023 NEC - Supplemental electrode rules and the twenty-five ohm resistance testing exception - Key differences between grounding electrode conductors and equipment grounding conductors - Ground-fault c...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: • The functional distinction between a grounded neutral conductor and an equipment grounding conductor. • Why the equipment grounding conductor is not intended to carry normal load current during standard operation. • System bonding concepts for standard simple services and premises supply equipment like generators and transformers. • Rules for mandatory downstream separation of neutral and ground to...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The technical distinction between grounding to earth and bonding metal components under the 2023 NEC. - Why earth resistance is too high to act as an effective ground-fault current path under Section 250.4. - How simplified Ohm's law models calculate fault current when relying on high-impedance earth loops. - Why adding remote ground r...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to calculate total resistance and circuit current for resistors connected in series. - How to determine branch currents and total current for parallel resistive circuits. - Why adding parallel branches decreases total circuit resistance while increasing total current. - How to avoid common exam traps when converting between series and p...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The fundamental distinction between real power in watts and energy consumption in watt-hours. - How apparent power, real power, and power factor relate in single-phase circuits. - How to calculate single-phase power and total energy for resistive loads. - How to calculate real power for balanced three-phase loads using line-to-line voltage a...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Fundamental Ohm's law relationships connecting voltage, current, and resistance in DC circuits - How to calculate current when 120 volts is applied across a 30 ohm resistive load - The key distinction between voltage across two points and current flowing through a conductor - Common exam traps including improper formula operations and incorrect t...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to efficiently navigate the Table of Contents and Index during a timed exam - The structural consolidation of definitions into Article 100 in the 2023 NEC - How to determine an article's scope using section .1 - The crucial distinction between mandatory code language and informational notes - How mandatory and permissive exceptions a...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why there is no single nationwide journeyman electrician license in the United States - The distinction between national standard core exams and state or local municipal tests - Code edition differences between ICC R17 (2023 NEC) and ICC T17 (2020 NEC) - How exam reference code editions can differ from locally enforced installation c...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to integrate all five NATE CHP-5 domains into a systematic troubleshooting workflow. - Why OSHA 1910.147 lockout/tagout and capacitor discharge must always precede diagnostic measurements. - How to separate symptoms like low suction pressure from root causes such as airflow restrictions. - Strategies for reading ladder schematics and measuring voltage d...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to perform steady-state post-repair operational testing to ensure complete system recovery. - Why comparing air handler static pressure, amp draw, and temperature rise to manufacturer specifications is essential for NATE exam scenarios. - The requirement to test all operational modes and actively prove safety controls function at designated setpoints. - H...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The distinction between visual checklist maintenance and quantitative measured proof of performance on NATE exams. - How to accurately evaluate electrical health through capacitor microfarad tolerances and loaded voltage checks. - Airflow verification techniques using total external static pressure and furnace temperature rise over simple filter checks. - Combustion analysis and h...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Understanding the exact step-by-step sequence of operation for gas furnaces on the NATE exam - Identifying why pressure switches must start open before inducer activation to pass safety checks - Measuring flame sensor rectification correctly in microamps DC to diagnose ignition lockouts - Differentiating between automatic reset high limits and manual r...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to diagnose reversing valve internal leakage using temperature differential checks across valve bodies. - The operational differences between time-temperature and demand defrost initiation and termination rules. - How to distinguish normal frost patterns from abnormal icing caused by low refrigerant charge or airflow restrictions. - Key definitions and exam applications f...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to isolate step-down transformer failures and identify secondary short circuits on the NATE HVAC exam - How to differentiate between mechanical causes and electrical failures in pressure switches and limit switches - How to test run capacitors and motor winding resistance using exact NATE pass-fail threshold standards - How to m...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to differentiate between low indoor airflow and low refrigerant charge using superheat and subcooling readings on the NATE HVAC exam. - Why verifying airflow, static pressure, and thermal load must always be completed before attaching gauges or adjusting refrigerant levels. - The specific system symptoms of dirty filters, blower faults, a...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to analyze suction pressure, discharge pressure, superheat, and subcooling together to diagnose NATE refrigerant circuit faults. - The critical diagnostic difference between an undercharged system and a liquid line restriction. - How TXV systems and fixed-orifice metering devices respond differently to refrigerant overcharge and undercharge conditions. - How to identify m...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to convert vague HVAC customer complaints into testable observations for NATE exam questions - Diagnostic techniques for evaluating timing, weather conditions, sounds, and odors in system troubleshooting - How thermostat settings and zone complaints impact airflow and relative humidity diagnostics - Why reviewing previous service work and operating history prevents c...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - The eleven-step chronological service call workflow required for NATE certification scenario questions. - Why safety inspections and customer interviews must always precede diagnostic tool usage and measurements. - How to differentiate root-cause diagnosis from symptom treatment when evaluating system failures like frozen coils. - The vital role of post-repair performance verification i...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - How to measure Total External Static Pressure and compare it against manufacturer blower charts before setting refrigerant charge. - Key differences between TXV subcooling verification and fixed orifice superheat calculations during system startup. - Critical steady-state timing requirements and carbon monoxide thresholds for gas furnace combustion analysis. - Requirements for verifying c...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Why dry nitrogen pressure testing and low-PSI purging during brazing are required before system evacuation on NATE exams. - How to evaluate a vacuum decay test at five hundred microns using the rule: Spike Means Leak, Slope Means Moisture. - Why verifying proper evaporator airflow at four hundred CFM per ton i...

This podcast is made by Ran Chen, who holds an EA license, Insurance and Securities licenses (Series 6, 63, 65), and the CFP® designation. He is passionate about opening access to high-quality exam preparation resources and helping learners prepare more effectively for professional certification exams. In this episode you will learn: - Gas shutoff valves must be installed within 6 feet of appliances, with sediment traps placed downstream of the shutoff valve and as close to the inlet as possible. - Gas line pressure testing over 0.5 PSI (14 inches water column) requires isolating or disconnecting appliance gas controls to prevent diaphragm damage. - Combustion air c...