Electrical Training Guides
Expert guides covering qualifications, regulations, career advice, and everything you need to know about the electrical trade.
From how to become an electrician and UK salary expectations to understanding EICRs, 18th Edition wiring regulations, and ECS cards — our free resources help you plan your training and career. Ready to get qualified? Browse our courses.
Becoming an Electrician
Everything you need to know about starting a career in the electrical trade.
How to Become an Electrician in the UK: 4 Routes Compared (2026)
Four routes to becoming a qualified electrician: apprenticeship (3–4 years), fast-track diploma (18–24 months), FE college, or experienced worker assessment. Costs from £0–£11k.
25 min readHow Much Does It Cost to Become an Electrician?
A full breakdown of training costs, exam fees, tools, and other expenses for each route to becoming a qualified electrician in the UK.
10 min readElectrician Salary UK 2026: £33K–£43K Average (Full Breakdown)
UK electricians earn £33,000–£43,000 on average in 2026, with self-employed electricians earning £50,000+. Breakdown by experience, specialism, region, JIB rates, and day rates.
15 min readCareer Change to Electrician at 30, 40 or 50: A Realistic Guide
Honest advice for adults retraining as an electrician — no experience needed. Train part-time around your job, qualify in 18–24 months, earn £35k–45k.
10 min readHow Long Does It Take to Become an Electrician?
Realistic timelines for every route — diploma, apprenticeship, experienced worker, and package courses.
9 min readElectrician Qualifications Explained: Full UK Guide
Every UK electrical qualification explained — from entry-level diplomas to the 18th Edition, inspection and testing, and specialist certifications.
12 min readWomen in Electrical Trades: Getting Started
A guide for women considering a career in electrical installation — addressing common concerns, role models, and practical advice.
8 min readElectrician Training vs University: Which Is Better?
An honest comparison of trade training vs a university degree — earnings, debt, job security, and career progression.
9 min readAm I Too Old to Become an Electrician? Age Is Not a Barrier
Honest answers for career changers in their 30s, 40s, and 50s — age demographics, earning potential, physical demands, and the realistic route to qualification.
12 min readBecoming an Electrician at 40: A Realistic Guide (2026)
Can you become an electrician at 40? Absolutely. Here's the realistic timeline, costs, and steps — from someone juggling a mortgage, family, and career change.
10 min readApprenticeship vs Fast-Track Courses: Which Route Into Electrical Work Is Right for You?
A side-by-side comparison of apprenticeships and intensive training courses — costs, timelines, pros and cons, and which route suits adult career changers.
13 min readCSCS Card vs ECS Card: Which One Do Electricians Need?
The difference between CSCS and ECS cards explained — which card electricians need, how to apply, card types and costs, and how the ECS Gold Card works.
11 min readMilitary to Electrician: ELCAS Funding, CTP & Your Route to Qualification
A complete guide for service leavers and veterans — ELCAS credits, CTP resettlement, military qualification mapping, and the step-by-step route from armed forces to qualified electrician.
14 min readUK Electrical Industry Bodies Explained: JIB, IET, NICEIC, NAPIT & More
Every major UK electrical industry organisation explained — what they do, whether you need to join, and when each one matters in your career as an electrician.
13 min readThe Adult Diploma Route to Becoming an Electrician
How the adult diploma route works as an alternative to apprenticeships for career changers wanting to become qualified electricians.
8 min readQualification Pathways
Understand the different routes to becoming a qualified electrician.
The Diploma Route to Becoming an Electrician
How the City & Guilds 2365 diploma route works — entry requirements, course structure, what you learn, and next steps after qualifying.
10 min readNVQ Level 3 Electrical: Everything You Need to Know
A complete guide to the City & Guilds 2357 NVQ Level 3 — who it is for, how it works, evidence requirements, and how it leads to your gold card.
12 min readNVQ Level 2 Electrical: Why It Doesn't Exist & What You Need Instead
There is no NVQ Level 2 in Electrical Installation. The qualification you need is the City & Guilds 2365-02 Level 2 Diploma. This guide explains the difference between diplomas and NVQs and the full electrician pathway.
8 min readAM2 Assessment: What to Expect & How to Prepare (2026 Guide)
Everything you need to know about the AM2 practical assessment — format, tasks, pass rates, costs, and how to prepare with the right training.
12 min readElectrical Apprenticeships UK: How They Work & Alternatives (2026)
Complete guide to electrical apprenticeships in the UK — duration, pay rates, how to find one, entry requirements, and how the fast-track diploma route compares for adult career changers.
18 min readLevel 2 vs Level 3 Electrical: What's the Difference?
A clear comparison of the Level 2 and Level 3 diplomas in electrical installation — content, difficulty, career outcomes, and whether you need both.
8 min readElectrician Qualification Pathway: Step-by-Step
A visual step-by-step map of how electrical qualifications fit together — from your first course to your ECS gold card.
8 min readCity & Guilds 2365 Course: Complete Guide
Everything about the C&G 2365 qualification — what it covers, how the course is structured, assessments, and what comes after.
10 min readFast-Track Electrician Course: Qualified in 18–24 Months Without an Apprenticeship
Fast-track electrician training: same City & Guilds qualifications as a 4-year apprenticeship, completed in 18–24 months. Online theory, intensive practicals, flexible schedule.
9 min readTESP Training Routes Explained: Every Path to Becoming a Qualified Electrician
The official TESP training routes mapped out — apprenticeship, college, self-funded adult learner, and experienced worker assessment. What each route requires and where they lead.
14 min readSpotting Rogue Electrical Training Providers: Red Flags to Watch For
How to identify unscrupulous electrical training providers — misleading claims, fake accreditation, pressure tactics, and what legitimate training looks like.
12 min readWhat Qualifications Do You Really Need to Become an Electrician?
The truth about electrical qualification requirements — what the EAS actually demands, why shortcuts do not work, and the only routes that lead to scheme membership and your gold card.
13 min readCity & Guilds Course Numbers Explained: What 2365, 2391, 2382 & Every Code Means
Decode every City & Guilds electrical course number — what the scheme numbers and suffixes mean, popularity rankings, and the order you should take them.
14 min readThe History of City & Guilds: From 1878 to Modern Electrical Qualifications
How City & Guilds was founded by the City of London and medieval trade guilds, and how their electrical qualifications evolved from the 236 to today's 2365.
11 min readAward vs Certificate vs Diploma vs NVQ: Electrical Qualification Types Explained
Understand the difference between Awards, Certificates, Diplomas, and NVQs — what the labels mean, how the UK qualification framework works, and which ones you need as an electrician.
11 min readOld Electrical Qualifications: Do Your 2360, 2330 or 2351 Certificates Still Count?
Find out whether your old City & Guilds 236, 2360, 2330, 2394, or 2395 qualifications are still valid, what you need to update, and the fastest route back to full recognition.
12 min readPart-Time Electrician Course: How to Train Around Your Job (2026)
Become an electrician part-time — study theory online in evenings, attend practical workshops on weekdays or weekends. Same City & Guilds qualification, flexible schedule.
8 min readElectrician Course Online: What You Can (and Can’t) Study From Home
Online electrician courses let you study theory from home, but practical skills need hands-on training. See how our online-plus-workshop model gets you qualified faster.
8 min readExperienced Worker Assessment (EWA): C&G 2346-03 Route to Level 3 for Working Electricians
The City & Guilds 2346-03 Experienced Worker Assessment is the assessment-only route for practising electricians with 5+ years of experience to gain a formal Level 3 qualification and ECS Gold Card. Eligibility, process, cost, and timeline explained.
9 min read18th Edition & Wiring Regulations
Guides to BS 7671 wiring regulations and the 18th Edition qualification.
What Is the 18th Edition? BS 7671 Explained
A plain-English guide to the 18th Edition wiring regulations — what they are, why they matter, key changes, and who needs the qualification.
12 min read18th Edition Exam: What to Expect & How to Pass
Practical guidance for the 2382-22 exam — format, pass mark, question types, revision tips, and common mistakes to avoid.
10 min read18th Edition Amendment 2: Key Changes Explained
A summary of the major changes introduced by Amendment 2 to BS 7671 and what they mean for practising electricians.
9 min read18th Edition Amendment 4: What Electricians Need to Know
Everything about BS 7671 Amendment 4 (2026) — key changes, timeline, the new 2382-26 exam, and what it means for practising electricians.
11 min readA History of UK Wiring Regulations: IEE to BS 7671
How UK wiring regulations have evolved from the first IEE rules in 1882 to today's 18th Edition BS 7671.
10 min readBS 7671 Key Changes Every Electrician Must Know
The most important regulation changes across recent editions of BS 7671 that affect day-to-day electrical work.
9 min readInspection & Testing
EICRs, testing procedures, and the City & Guilds 2391 qualification.
EICR Explained: What Is an Electrical Installation Condition Report?
Everything about EICRs — what they are, when they are required, who can carry them out, costs, and observation codes.
12 min readCity & Guilds 2391 Course: Everything You Need to Know
A complete guide to the 2391-52 qualification — course content, practical assessments, exam format, and career benefits.
12 min readEICR Codes Explained: C1, C2, C3 and FI
What the observation codes on an EICR mean, how they are classified, and what action is required for each.
8 min readElectrical Testing Procedures: A Practical Guide
A guide to the key electrical tests — continuity, insulation resistance, earth fault loop impedance, RCD testing, and polarity checks.
12 min readEIC vs EICR: What's the Difference?
A clear explanation of the difference between an Electrical Installation Certificate and an Electrical Installation Condition Report.
7 min readPAT Testing Explained: What It Is, Who Needs It & How to Get Qualified
What PAT testing is, who needs it, legal requirements, and why 2391 is the professional next step.
10 min readPAT Testing for Landlords: Legal Requirements, Costs & How to Comply (2026)
Landlord PAT testing obligations explained — legal duties, 2025-2026 regulation changes, penalties up to £40,000, and how to get qualified.
14 min readHow to Become a PAT Tester: Course, Equipment & Earning Potential (2026)
How to become a PAT tester in the UK — City & Guilds 2377-77 course, equipment costs, earning potential, and how to build a PAT testing business.
12 min readCity & Guilds 2391 Inspection & Testing Guide
Everything you need to know about the 2391-52 Inspection and Testing qualification — course content, exam format, and career benefits.
10 min readEICR Cost UK 2026: £100–£300 (Prices by Property Size)
EICRs cost £100–£300 for UK homes (average £200). Prices for flats, houses, HMOs and commercial properties. What affects the cost, remedial work pricing, and how to qualify to carry out EICRs.
10 min readEV Charging
Electric vehicle charger installation qualifications and career opportunities.
How to Become an EV Charger Installer
The qualifications, training, and steps needed to install electric vehicle charging points in the UK.
12 min readEV Charging Course: What You'll Learn & Career Opportunities
What the City & Guilds 2921-34 EV charging course covers, who it is for, and the career opportunities it opens up.
10 min readEV Charger Installation Regulations UK
The regulations, standards, and codes of practice that govern EV charger installation in the UK.
10 min readStarting an EV Charging Installation Business
The business case for EV charger installation — market size, earning potential, and how to get started.
9 min readDomestic vs Commercial EV Charging: Qualifications & Differences
The differences between domestic and commercial EV charging installations — qualifications, equipment, and regulations.
9 min readSolar PV & Renewables
Solar panel installation, battery storage, and green energy careers.
How to Become a Solar Panel Installer in the UK
The qualifications, training pathway, and career prospects for solar PV installation in the UK.
12 min readSolar PV Course: What to Expect & Career Prospects
What the solar PV installation course covers, prerequisites, and the career opportunities in renewable energy.
10 min readMCS Certification Explained: What Installers Need to Know
How MCS certification works, why it matters for solar and battery storage installers, and how to get certified.
9 min readBattery Storage Systems: A Guide for Electricians
How battery storage works, the growing market, qualifications needed, and opportunities for electricians.
10 min readGreen Skills for Electricians: Future-Proof Your Career
How renewable technologies are transforming the electrical trade and the skills you need to stay ahead.
9 min readRegistration & Compliance
ECS cards, Part P, competent person schemes, and industry registration.
JIB Preferred Provider: What It Means & Why It Matters (2026)
JIB Preferred Provider is a recognised upgrade over JIB Approved Centre. What the status means, how it differs, and why it matters for your ECS Gold Card application and career.
7 min readECS Card Types: Which Card Do You Need? (2026 Guide)
Every ECS card type explained — Trainee, Registered, Gold, Labourer and more. Colours, requirements, costs (~£36), and how to apply for each.
15 min readECS Gold Card Requirements: Full Qualification Checklist (2026)
ECS Gold Card requires NVQ Level 3 (or Experienced Worker Assessment), current BS 7671 18th Edition, and ECS Health & Safety Assessment. Three routes explained with a full checklist.
14 min readECS Health & Safety Test: Free Practice Questions & Revision Guide
ECS HSE practice quiz with all 327 official revision questions. Free topic-by-topic study with instant feedback. Upgrade to Mock Exam Pro for timed mock exams, adaptive learning, and progress tracking.
15 min readHow to Renew Your ECS Card: Steps, Costs & HSEAP Retake
ECS card expired or expiring? Step-by-step renewal guide — HSEAP retake, updated qualifications, costs (~£36), and timeline. Free practice quiz included.
6 min readPart P Building Regulations: What Electricians Need to Know (2026)
What is Part P? Do you need a "Part P course"? We explain the building regulations for electrical work, what qualifications you actually need, and how to self-certify.
10 min readNICEIC vs NAPIT: Which Scheme Should You Join?
A comparison of the two main competent person schemes — costs, requirements, reputation, and which is right for you.
10 min readCompetent Person Schemes for Electricians: Full Guide
What competent person schemes are, why you need one, the main providers, and the qualification requirements.
9 min readLandlord Electrical Safety: EICR Rules, Costs & Penalties (2026)
Landlord EICR obligations under the 2020 regulations — when you need one, timelines for new and existing tenancies, fines up to £30,000, costs (£100–£300), and what to do if the report fails.
10 min readHow to Register as an Electrician or Electrical Business
Practical steps for registering as a sole trader, limited company, or partnership in the electrical trade.
8 min readJIB Gold Card for Domestic Electricians
How domestic electricians can obtain the JIB ECS Gold Card — required qualifications, application process, and eligibility criteria.
7 min readTechnical Knowledge
Core electrical knowledge — circuits, testing, earthing, and safe working.
UK Wiring Colours: Brown (Live), Blue (Neutral), Green/Yellow (Earth)
UK wiring colours since April 2006: brown = live, blue = neutral, green/yellow = earth. Old colours (pre-2006): red = live, black = neutral. Quick reference table, three-phase colours, and mixed installation safety rules.
14 min readSafe Isolation Procedures: Step-by-Step Guide
The correct safe isolation procedure in accordance with GS38 — equipment, steps, and common mistakes.
10 min readEarthing and Bonding Explained
What earthing and bonding are, why they are essential for electrical safety, and how to check they are correct.
10 min readConsumer Unit Guide: Replacement, Regulations & Costs
Everything about consumer units — types, replacement regulations, costs, and when an upgrade is needed.
10 min readDomestic Rewire Guide for Electricians
A practical guide to domestic rewiring — when it is needed, the process, first and second fix stages, and compliance.
10 min readCable Safe Zones: Wiring Regulations Explained
What cable safe zones are, where they apply in walls, ceilings, and floors, and the protection requirements.
8 min readTypes of Electrical Circuits: Ring, Radial & Lighting
An overview of the main circuit types used in domestic electrical installations and when each is used.
9 min readElectrical Testing Equipment: What You Need & Why
A guide to the test instruments electricians need — multifunction testers, insulation resistance testers, and more.
9 min readConsumer Unit Replacement Cost UK: £500–£1,200 (2026 Prices)
Consumer unit replacement costs £500–£800 for a dual RCD board or £800–£1,200 for a full RCBO board in 2026. Prices by property size, labour costs, Part P certification requirements, and signs you need a new fuse box.
9 min readBusiness & Self-Employment
Going self-employed, pricing work, tools, and running an electrical business.
How to Go Self-Employed as an Electrician UK (2026 Step-by-Step)
Step-by-step guide to setting up as a self-employed electrician in the UK. Covers HMRC registration, public liability insurance, Part P scheme, pricing your work, VAT threshold (£90,000), and finding customers.
12 min readElectrician Day Rates UK 2026: £300–£500/Day (Hourly & JIB Rates)
UK electrician day rates: £300–£500 (average £350). Hourly rates £45–£60, up to £100 in London. Includes 2026 JIB graded rates and pricing advice for self-employed electricians.
10 min readEssential Electrician Tools: Complete Kit List
Every tool an electrician needs — from basic hand tools to specialist test equipment, with buying guidance.
9 min readDomestic vs Commercial Electrician: Differences & Pay
The key differences between domestic and commercial electrical work — qualifications, day-to-day work, and earning potential.
9 min readElectrician Insurance: What Cover Do You Need?
The insurance policies electricians need — public liability, professional indemnity, tools cover, and van insurance.
8 min readExams & Funding
Exam preparation tips and funding options for your training.
Electrical Exam Tips: How to Pass City & Guilds Exams
Practical exam tips for City & Guilds electrical qualifications — revision strategies, time management, and common pitfalls.
10 min readELCAS Funding for Electrical Training: Full Guide
How Enhanced Learning Credits work, eligibility requirements, and how to use ELCAS funding for electrical training.
9 min readFunding Your Electrician Training: All Options
Every funding option for electrical training — ELCAS, bursaries, payment plans, employer sponsorship, and government schemes.
10 min readFree Electrician Courses UK: What's Actually Available (2026)
Are there free electrician courses in the UK? We break down the realistic options — apprenticeships, college, skills bootcamps — and what "free" actually means.
9 min readCareer Comparisons & Job Security
How electrical careers compare and why the trade is future-proof.
Electrician vs Plumber UK: Which Pays More? (2026 Comparison)
Electricians earn £33,500 vs plumbers at £31,900 on average. Full 2026 comparison of training costs, salaries, job demand, daily work, and future career growth in both trades.
12 min readWhy Electricians Will Always Be in Demand
The economic, technological, and regulatory factors that make electrical work one of the most secure trade careers.
12 min readElectrician vs Gas Engineer: Which Career Is Better?
A comparison of electrician and gas engineer careers — training, earnings, the gas boiler ban, and future demand.
10 min readData Centre Electrician: A Growing Career Path
How the UK data centre boom is creating high-paying opportunities for qualified electricians.
10 min readUK Electrician Shortage: Facts, Figures & What It Means for You
Current data on the UK electrician skills shortage — retirement rates, training numbers, and what this means for career prospects.
10 min readHighest Paying Electrical Specialisms in 2026
The electrical specialisms commanding the highest day rates and salaries — from EV charging to data centres.
10 min readJIB Grading System Explained: Grades, Pay Rates & Requirements
The JIB grading structure for electricians — grade definitions, current pay rates, qualification requirements, and how to progress.
10 min readFire Alarm Installation: BS 5839, Qualifications & Career Guide
A guide to fire alarm installation as a career — BS 5839 standards, qualifications needed, and opportunities for electricians.
10 min readEmergency Lighting: BS 5266, Testing Requirements & Career Opportunities
Emergency lighting explained — BS 5266 requirements, testing schedules, system types, and why it is a valuable specialism for electricians.
10 min readIs Being an Electrician a Good Career? Honest Pros & Cons (2026)
Yes — electricians earn £33,000–£55,000+, the UK needs 250,000+ construction workers by 2028, and the trade is future-proof. Honest breakdown of salary, demand, pros, cons, and how to start.
11 min readIndustry Trends & Future
Smart homes, heat pumps, net zero, and the future of the electrical trade.
Smart Home Installation: Opportunities for Electricians
How smart home technology is creating new work for electricians and the skills you need to get started.
10 min readHeat Pumps and Electricians: What You Need to Know
How the gas boiler phase-out is driving demand for electricians and what qualifications are relevant.
10 min readUK Construction Boom: Why Electricians Are Needed More Than Ever
How major infrastructure projects, housing targets, and data centres are driving unprecedented demand for electricians.
9 min readWill AI Replace Electricians? Why the Trade Is Robot-Proof
Why physical trades like electrical work are among the safest careers from automation and AI disruption.
9 min readNet Zero 2050: What It Means for Electricians
How the UK's net zero commitment is transforming the electrical industry and creating new career opportunities.
10 min readPractical Guides
Day-to-day guidance for working electricians.
A Day in the Life of an Electrician
What a typical working day looks like for domestic and commercial electricians at different career stages.
9 min readElectrician Van Setup: Kit, Storage & Best Vans
Practical advice on choosing and fitting out a van for electrical work — popular models, racking systems, and costs.
9 min readHow to Quote Electrical Jobs: Pricing Guide for Electricians
How to price electrical work — day rates, fixed pricing, common job costs, and tips for winning quotes.
10 min readFirst Fix vs Second Fix Electrical: What's Involved
What first fix and second fix mean in electrical installation, what each stage includes, and the skills required.
8 min readElectrical Certificates Explained: EIC, EICR, Minor Works & Part P
Every electrical certificate explained — when each is required, who can issue them, and what they cover.
10 min readSafety & Regulations
Electrical safety, building regulations, and compliance.
Electrical Safety at Home: Warning Signs & When to Call an Electrician
Common warning signs of electrical problems, basic safety tips, and when you need to call a qualified electrician.
9 min readUK Electrical Regulations: A Complete Timeline
The history of electrical regulation in the UK from 1882 to the present day — key milestones, editions, and amendments.
9 min readNotifiable Electrical Work: What Requires Building Control?
Which types of electrical work must be notified to building control, who can self-certify, and the penalties for non-compliance.
9 min readPart P Certificate Guide: How to Get Part P Registered (2026)
What is a Part P certificate? How to become Part P registered through competent person schemes, what qualifications you need, costs, and the difference between Part P and BS 7671.
10 min readRewiring a House: Costs, Process & What to Expect (2026)
How much does it cost to rewire a house? Typical costs by property size, what the process involves, how long it takes, Part P requirements, and how to find a qualified electrician.
12 min readCalculations & Theory
Core electrical calculations and technical theory for students and practising electricians.
How to Calculate Maximum Demand for Electrical Installations
A practical guide to calculating maximum demand — formulae, diversity factors, worked examples, and BS 7671 requirements.
12 min readDiversity Factors Explained: A Practical Guide for Electricians
How to apply diversity factors to electrical circuit loads — tables, worked examples, and when diversity can and cannot be applied.
10 min readVolt Drop Calculations: BS 7671 Limits & Worked Examples
How to calculate voltage drop in electrical circuits — formulae, BS 7671 limits, cable selection tables, and worked examples.
11 min readZs Values & Earth Fault Loop Impedance Explained
What Zs values are, how earth fault loop impedance works, the Zs = Ze + R1+R2 formula, and maximum permitted values from BS 7671.
11 min readThree-Phase Power for Electricians: Fundamentals & Applications
Three-phase power explained — how it works, calculations, star and delta configurations, and when electricians encounter it.
12 min readElectrical Fault Finding: The 6-Step Systematic Method
Step-by-step guide to the six-point fault finding technique used by working electricians. Covers safe isolation, instrument selection, common fault types, and logical diagnosis with worked examples.
12 min readRing Main vs Radial Circuits: How They Work & When to Use Each
Understand the difference between ring final circuits and radial circuits — how each works, advantages and disadvantages, spur rules, testing procedures, and what the exams ask.
13 min readUK Electrical Symbols: Complete BS EN 60617 Reference (50+ Symbols)
All UK electrical symbols to BS EN 60617 with clear diagrams — switches, sockets, lighting, distribution boards, protective devices, and wiring methods. Essential for 2365 and 2391 exams.
12 min readProtective Devices
RCDs, RCBOs, SPDs, AFDDs and modern circuit protection.
Special Locations
Electrical regulations for bathrooms, kitchens, outdoors, and other special installations.
Bathroom Electrical Regulations: Zones, IP Ratings & Requirements
BS 7671 Section 701 explained — bathroom zones 0 to 2, IP rating requirements, RCD protection, and what can be installed where.
11 min readKitchen Electrical Regulations: Circuits, RCDs & Positioning Rules
Electrical requirements for kitchens — circuit design, RCD protection, socket positioning, and common installation mistakes.
10 min readOutdoor & Garden Electrical Regulations
Regulations for outdoor electrical installations — garden lighting, outbuilding supplies, IP ratings, RCD protection, and Part P requirements.
11 min readHot Tub Electrical Requirements: Supply, RCD Protection & Installation
Electrical requirements for hot tub installations — supply sizing, RCD protection, cable selection, and BS 7671 compliance.
10 min readSwimming Pool Electrical Regulations (BS 7671 Section 702)
Electrical regulations for swimming pools and fountains — zones, equipotential bonding, permitted equipment, and testing requirements.
11 min readElectric Underfloor Heating: Regulations, Installation & Opportunities
Electrical requirements for underfloor heating systems — circuit design, RCD protection, regulations, and the growing market for electricians.
10 min read