Engineering intelligence for medium-voltage switchgear.
Source-aware technical guidance for specification, design, protection, testing, commissioning and safe operation—organized for engineers who need practical answers.
- IEC / IEEE mapped
- Application focused
- Sources and revisions recorded
Six permanent technical libraries
One controlled structure from fundamentals through protection, LVC engineering, FAT and safety—without turning every new article into a new section.
MV Switchgear Fundamentals
Ratings, configurations, insulation, earthing, internal arc concepts and equipment selection.
Explore disciplineCircuit Breakers & Drives
Vacuum interruption, switching duties, mechanisms, coils, timing, interlocks and diagnostics.
Explore disciplineProtection & Control
Relays, CTs and VTs, trip circuits, selectivity, IEC 61850 and secondary interfaces.
Explore disciplineLow-Voltage Compartments
LVC architecture, schematics, wiring, EMC, terminals, documentation and verification.
Explore disciplineTesting & FAT
Routine and type tests, inspection plans, FAT methods, evidence and acceptance criteria.
Explore disciplineStandards & Safety
IEC and IEEE requirements, arc-flash risk, safe operation and environmental regulation.
Explore disciplineRecently published engineering guides
ANSI 59N and 64 Ground-Fault Protection: Calculated 3V0 vs Broken-Delta Voltage
A structured engineering comparison of 59N and 64 protection, calculated 3V0, broken-delta voltage, VT requirements, settings, grounding methods, and commissioning tests.
View detailsWire Numbering in Switchgear LVCs: Standards, Methods and Best Practice
A practical engineering guide to wire numbering in switchgear low-voltage compartments, covering IEC requirements, numbering philosophies, EPLAN implementation, marker selection, quality control and a worked 110 VDC trip-circuit…
View details
G98, G99 and G100 Explained: The Complete UK Grid-Connection Guide
A practical engineering guide to G98, G99 and G100 for solar PV, battery storage, generators and V2G in Great Britain—including DNO applications, protection, export limitation, commissioning and a…
View details
Medium-Voltage Feeder Protection: A Complete Engineering Guide
A practical engineering guide to protecting MV incomers, outgoing feeders, transformers, motors and capacitor banks—with function matrices, trip logic, setting principles and official relay application diagrams.
View details
DC MCB Polarity Explained: Correct Wiring, Arc Extinction, and Common Mistakes
Polarized DC miniature circuit breakers must be wired in the direction tested by the manufacturer. This guide explains arc physics, terminal markings, ABB SB200 DC diagrams, voltage-to-earth limits,…
View details
Hitachi Energy RTXP 24 Test Switch: Complete Wiring, CT-Shorting and Secondary-Injection Guide
A field-focused engineering guide to the Hitachi Energy RTXP 24 COMBITEST switch, including contact sequencing, the RK 926 315-AK terminal map, CT and trip safety, accessories, mounting and…
View detailsProducts, manufacturers and reusable resources
A growing evidence-led database with exact source links, technical ratings, document revisions, verification dates and lifecycle status.
Product intelligence
Compare equipment by ratings, technology, application and manufacturer.
Open directoryManufacturer directory
Independent profiles connected to official portfolios and product families.
Open directoryEngineering resources
Practical checklists, templates, diagrams, calculators and videos.
Open directoryInnovation, regulation and the technologies changing switchgear
Follow verified product developments and the specialist technology providers influencing protection, testing, monitoring and lifecycle decisions.
Switchgear Innovation Hub
F-gas-free insulation, solid dielectric systems, grid-edge automation, digital switchgear and regulatory change.
Explore innovationTechnology providers
Protection, test, diagnostic, monitoring and gas-lifecycle specialists kept distinct from switchgear manufacturers.
Explore providers