Residential Electrical Service Panels — Power, Panels, and the Code

In this episode I cover everything a Class B general contractor needs to know about residential electrical service panels for the CSLB licensing examination. From the historical reason your home runs on alternating current to the specific code numbers that drive exam questions, I walk you through service sizing under both the California Electrical Code and Title 24 Energy Code, the function of every conductor entering the main panel, the physics of split-phase voltage, grounding electrode systems including the Ufer ground, meter placement clearances, working space requirements, permit rules, and the authority hierarchy governing this work in California.

Key concepts covered include the 100-amp historical CEC minimum and the 200-amp modern standard driven by California Energy Code Title 24, why the two hot legs are 180 degrees out of phase, why neutral and ground bond only at the main panel and never at a subpanel, the three grounding electrode methods under CEC Article 250.52, the 3-foot clearance requirement from doors and gas meter vents, the 10-foot maximum distance from the front corner of the residence, working space dimensions at the panel, and how the Authority Having Jurisdiction governs code compliance and alternate methods.

I built an audio practice quiz specifically for this episode — twelve questions read aloud so you can answer by tapping while driving to a job site. Find the link in the description below. Tap the link that says PassTheCSLB and it will take you directly to the quiz.

DISCLAIMER: This content is produced by Pass The CSLB, an independent educational channel. Not legal, professional, or engineering advice. Based on publicly available CSLB study resources. Exam content is set by PSI and CSLB and may change — always verify with official CSLB materials. No exam outcome is guaranteed.

0:00 Introduction and Disclaimer
1:18 A Hundred and Forty Years of Electrical History
3:42 The Journey of Power: Pole to Panel
5:40 Split-Phase: The Physics Behind 120 and 240 Volts
8:38 The Four Wires and What Each One Does
12:05 Service Sizing: From 100 Amps to California's New Mandate
15:20 The Grounding Electrode System and the Ufer Ground Story
18:29 Meter Placement and Panel Working Space
20:46 Permits, Authority, and the AHJ
23:35 Memory Anchors and Key Numbers

California B License Exam - Residential Electrical Service Panels | Study Guide

Electrical Calculations for the California General B Contractor Exam

I built this episode specifically for General B candidates who need to master electrical calculations before walking into the PSI testing center. In this episode I cover every calculation type that official CSLB preparation resources consistently identify as testable material — from the foundational Ohm's Law and Watt's Law triangles through continuous load sizing, voltage drop limits, kitchen circuit baselines, demand factors, and three-phase power. Because this exam is strictly closed-book with a calculator provided, I go beyond explaining the concepts and focus on locking the exact numbers, multipliers, and constants into memory.

Key concepts covered in this episode include: Ohm's Law and Watt's Law triangle method with original mnemonics, the 80 percent continuous load rule and 125 percent conductor sizing multiplier, mixed continuous and noncontinuous load calculations, the 3 percent branch circuit and 5 percent total system voltage drop limits, the 1,500 volt-ampere minimum for kitchen small appliance circuits, demand factors with electric heat calculated at 100 percent, and the 1.732 three-phase power constant. I also cover the history of these electrical units — the real stories behind Volta, Ampere, Ohm, and Watt — because knowing the why is what makes the numbers stick.

There is an audio practice quiz linked in the description specifically for this episode. The quiz is designed for people studying on the go — questions are read aloud and you answer by tapping. If you are driving to a job site, in between tasks, or have limited sitting-down study time, that quiz format was built for you. Find the PassTheCSLB link in the description below.

DISCLAIMER: This content is produced by Pass The CSLB, an independent educational channel. Not legal, professional, or engineering advice. Based on publicly available CSLB study resources. Exam content is set by PSI and CSLB and may change — always verify with official CSLB materials. No exam outcome is guaranteed.

0:00 Introduction and the History of Electrical Units
1:23 Ohm's Law and Watt's Law — The Two Triangles
8:22 The 80 Percent Rule and Continuous Loads
11:41 Mixed Loads — Continuous and Noncontinuous Together
14:13 Voltage Drop — The Distance Problem
17:48 The 1500 Volt-Ampere Kitchen Rule
20:04 Demand Factors and Service Sizing
21:47 Three-Phase Power and the 1.732 Factor
25:52 Closed-Book Survival — Eight Trigger Numbers

California B License Exam - Electrical Calculations | Complete Study Guide

Electrical Conductors: Wire Types, Sizing, and California Code

I built this episode to cover everything the General B exam draws from when it tests electrical conductors — and it tests this material under the Core Trades domain, which is thirty percent of your total score. In this episode I walk you through how to read wire gauge designations, why the A W G system runs backwards, how to identify every cable type by its construction and application, and the single most important California-specific amendment that overrides the base National Electrical Code on aluminum wiring.

Key concepts covered in this episode: American Wire Gauge sizing from 18 A W G through 4/0 A W G and into the k c m i l and M C M system, the letter-by-letter breakdown of T H H N and T H W N dash two wire, N M cable jacket color codes and ampacity ratings, the five-times bending radius rule, service entrance cable, the critical grounding difference between Type MC and Type A C cable, underground feeder cable construction, the continuous load eighty percent rule, and the California Electrical Code amendment to Article 310 restricting aluminum conductors to a minimum of 1/0 A W G. All material is referenced to the 2025 California Electrical Code derived from the 2023 NEC under Title 24, Part 3.

There is an audio practice quiz in the description specifically built for this episode. Twelve questions, read aloud, you tap your answer — designed for people studying on the go. Find the link in the description below marked PassTheCSLB and tap it to go straight to the quiz.

DISCLAIMER: This content is produced by Pass The CSLB, an independent educational channel. Not legal, professional, or engineering advice. Based on publicly available CSLB study resources. Exam content is set by PSI and CSLB and may change — always verify with official CSLB materials. No exam outcome is guaranteed.

0:00 Introduction and Disclaimer
1:16 Copper and Aluminum: The History Behind the Rules
4:59 The A W G Sizing System
8:14 T H H N and T H W N dash two Decoded
11:00 N M cable and Romex
14:54 Ampacity and Load Rules
17:12 Cable Types: SE, MC, AC, and UF
22:50 California Electrical Code Amendments
25:36 How to Think on the Exam
28:49 Call to Action

California B License Exam - Electrical Conductors | Complete Study Guide

Concrete Mixtures and Placement — CSLB General B Exam Prep

В этом эпизоде я разбираю одну из самых насыщенных числами тем экзамена General B — бетонные смеси и их пропорции, пять типов Portland cement, полную кривую твердения с ограничениями по нагрузке, методы укладки включая boom truck и правила вибрирования, расчёт объёма в кубических ярдах, minimum cover для арматуры, lap splice и контроль качества через slump test и цилиндры. Я объясняю каждое число с точки зрения инженерной логики — почему оно такое, откуда взялось, и как оно отражено в официальных учебных материалах CSLB. После этого эпизода ты сможешь уверенно отвечать на вопросы по любому из этих подразделов.

In this episode, I break down one of the most number-dense topics on the California General B contractor exam — concrete mix ratios, all five Portland cement types, the full curing timeline with load restrictions, placement methods including boom truck logistics and vibrator rules, cubic yard volume calculations, rebar minimum cover, lap splice requirements, and quality control through slump testing and cylinder acceptance. Every number is explained through engineering logic — not just memorized. After watching, you will be prepared to answer questions across all of these sub-topics as they appear in CSLB study materials.

Аудиовикторина по этому эпизоду уже готова — двенадцать вопросов в стиле PSI, читаются вслух, отвечаешь нажатием. Идеально для учёбы в дороге, на объекте или в обеденный перерыв. Ссылку найдёшь в описании под видео — PassTheCSLB.

DISCLAIMER: This content is produced by Pass The CSLB, an independent educational channel. Not legal, professional, or engineering advice. Based on publicly available CSLB study resources. Exam content is set by PSI and CSLB and may change — always verify with official CSLB materials. No exam outcome is guaranteed.

0:00 Введение / Introduction
1:05 Состав бетона / Concrete Mix Ratios
4:06 Виды цемента / Portland Cement Types
8:23 Сроки твердения и PSI / Curing Timeline & Minimum PSI
11:23 Методы укладки / Placement Methods
14:07 Расчёт объёма / Volume Calculations
15:51 Арматура и контроль качества / Rebar Cover & Quality Control
19:41 Ключевые числа / Key Numbers to Memorize

Бетонные Смеси и Укладка | Concrete Mixtures & Placement | CSLB B

Concrete Finishing, Joints, Slump Test & Site Preparation — California Class B Exam

В этом эпизоде я разбираю полный цикл бетонных работ для экзамена California General Building, Class B. Ты узнаешь точную последовательность операций отделки бетонной поверхности — от screeding до broom finishing, три типа швов с формулами расчёта глубины и расстояния, полный протокол slump test по ASTM C143, правила curing и все критические числа, которые нужно знать наизусть. После этого эпизода ты будешь уверенно ориентироваться в этих темах и отвечать на вопросы по Core Trades — Domain Three.

This episode covers the full concrete work cycle for the California General Building Class B exam. Topics include the exact sequence of concrete surface finishing operations from screeding to broom finishing, all three joint types with depth and spacing formulas, the complete slump test protocol per ASTM C143, curing methods and temperature thresholds, and all critical numbers required for the exam. After watching, you will be fully prepared to answer Core Trades Domain Three questions on concrete and site preparation.

К этому эпизоду есть аудиовикторина — вопросы зачитываются вслух, отвечаешь нажатием на экран. Это идеально для тех, кто учится в дороге, на обеде или прямо на объекте. Ссылка — в описании под видео: PassTheCSLB.

0:00 Введение / Introduction
1:15 Подготовка площадки / Site Preparation
5:53 Последовательность отделки / Finishing Sequence
10:34 Типы швов / Joint Types & Formulas
14:57 Испытание на осадку / Slump Test
19:03 Уход за бетоном / Curing
22:24 Ключевые числа / Key Numbers to Memorize

This content is produced by Pass The CSLB, an independent educational channel. Not legal, professional, or engineering advice. Based on publicly available CSLB study resources. Exam content is set by PSI and CSLB and may change — always verify with official CSLB materials. No exam outcome is guaranteed.

| Concrete Finishing & Joints | CSLB B

В этом эпизоде я разбираю одну из самых насыщенных числами тем экзамена General B — бетонные смеси и их пропорции, пять типов Portland cement, полную кривую твердения с ограничениями по нагрузке, методы укладки включая boom truck и правила вибрирования, расчёт объёма в кубических ярдах, minimum cover для арматуры, lap splice и контроль качества через slump test и цилиндры. Я объясняю каждое число с точки зрения инженерной логики — почему оно такое, откуда взялось, и как оно отражено в официальных учебных материалах CSLB. После этого эпизода ты сможешь уверенно отвечать на вопросы по любому из этих подразделов.

In this episode, I break down one of the most number-dense topics on the California General B contractor exam — concrete mix ratios, all five Portland cement types, the full curing timeline with load restrictions, placement methods including boom truck logistics and vibrator rules, cubic yard volume calculations, rebar minimum cover, lap splice requirements, and quality control through slump testing and cylinder acceptance. Every number is explained through engineering logic — not just memorized. After watching, you will be prepared to answer questions across all of these sub-topics as they appear in CSLB study materials.

Аудиовикторина по этому эпизоду уже готова — двенадцать вопросов в стиле PSI, читаются вслух, отвечаешь нажатием. Идеально для учёбы в дороге, на объекте или в обеденный перерыв. Ссылку найдёшь в описании под видео — PassTheCSLB.

DISCLAIMER: This content is produced by Pass The CSLB, an independent educational channel. Not legal, professional, or engineering advice. Based on publicly available CSLB study resources. Exam content is set by PSI and CSLB and may change — always verify with official CSLB materials. No exam outcome is guaranteed.

0:00 Введение / Introduction
1:14 Состав бетона / Concrete Mix Ratios
4:42 Виды цемента / Portland Cement Types
9:24 Сроки твердения и PSI / Curing Timeline & Minimum PSI
12:39 Методы укладки / Placement Methods
15:40 Расчёт объёма / Volume Calculations
17:36 Арматура и контроль качества / Rebar Cover & Quality Control
22:05 Ключевые числа / Key Numbers to Memorize

Study smarter.
Pass the CSLB.

Built for how contractors actually study

Audio-first

Real exam format

The WHY behind every rule

One topic at a time

Latest Study Episodes

Residential Electrical Service Panels — Power, Panels, and the Code

Electrical Calculations for the California General B Contractor Exam

Electrical Conductors: Wire Types, Sizing, and California Code

Concrete Mixtures and Placement — CSLB General B Exam Prep

Concrete Finishing, Joints, Slump Test & Site Preparation — California Class B Exam

Concrete Mixtures and Placement — CSLB General B Exam Prep

New episodes every week

Study smarter.Pass the CSLB.

Built for how contractors actually study

Audio-first

Real exam format

The WHY behind every rule

One topic at a time

Latest Study Episodes

Residential Electrical Service Panels — Power, Panels, and the Code

Electrical Calculations for the California General B Contractor Exam

Electrical Conductors: Wire Types, Sizing, and California Code

Concrete Mixtures and Placement — CSLB General B Exam Prep

Concrete Finishing, Joints, Slump Test & Site Preparation — California Class B Exam

Concrete Mixtures and Placement — CSLB General B Exam Prep

New episodes every week

Study smarter.
Pass the CSLB.