Field Guides
Electrical how-to guides, written by the trade
Practical, NEC-referenced field guides from a licensed commercial contractor — the same fundamentals our crews use every day. Pair them with our free calculators.
Power & Distribution
Power & Distribution
How to Wire a Three-Phase Transformer →
Wire a 480V delta to 208Y/120V dry-type step-down: conductors, OCPD per 450.3(B), 250.30 grounding, taps, torque, and energization.
Power & DistributionHow to Size a Bonding Jumper →
Which table applies to which jumper, the 12.5% rule over 1100 kcmil, parallel runs, and worked examples you can check your math against.
Power & DistributionHow to Size a Grounding Electrode Conductor →
Size the GEC from Table 250.66, apply the rod and Ufer caps, and bond the whole electrode system right the first time.
Power & DistributionHow to Install a Commercial Subpanel →
Feeder sizing, isolated neutral, working clearances, and AIC — the right way to add a panelboard downstream of the service.
Wiring Methods
Wiring Methods
How to Wire a Commercial Outlet →
Box selection, MC makeup, pigtails vs feed-through, 210.8(B) GFCI rules, and torque specs for a 20A commercial receptacle.
Wiring MethodsHow to Bend EMT Conduit →
Take-up, offset multipliers, shrink, kicks, and saddles — plus the 360° rule — so your EMT runs come out clean the first time.
Wiring MethodsHow to Pull Wire Through Conduit →
Verify fill, set up the pull right, and land conductors without damage — from pull string to bushings.
Wiring MethodsHow to Identify Commercial Wire Colors →
Read phase, neutral, and ground colors on 120/208V and 277/480V systems — and know which colors the NEC actually mandates.
Wiring MethodsHow to Terminate MC Cable →
Cut the armor clean, use listed fittings, secure within 12 inches — MC terminations done right, per NEC Article 330.
Motors & Controls
Motors & Controls
How to Wire a Three-Phase Motor Starter →
Power wiring, 3-wire control with seal-in, overload settings per 430.32, and branch-circuit sizing per 430.22 — start to bump test.
Motors & ControlsHow to Wire a 480V Disconnect →
Size, mount, and terminate a 480V safety switch for RTUs and motors — fusible vs non-fusible, NEC 430.110 and 440.14, phase rotation.
Testing & Workmanship
Testing & Workmanship
How to Megger Test a Motor or Feeder →
Insulation resistance testing done right: voltages, minimum megohms, temperature correction, and clean baseline records.
Testing & WorkmanshipHow to Torque Electrical Terminations →
NEC 110.14(D) makes torqued terminations mandatory. Finding the values, using the right tools, and skipping the retorque myths.
Lighting & Life Safety
Lighting & Life Safety
How to Wire a Lighting Contactor →
Mechanically vs electrically held contactors, photocell/time clock logic, HOA switches, and sizing for parking lot and site lighting.
Lighting & Life SafetyHow to Wire an Exit Sign and Emergency Light →
The unswitched-hot rule, the three-wire hookup, and the testing duties for battery-backup exit signs and emergency lights.
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