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Engineering Guide · Electrical

How Electrical Engineering Works

Electrical engineering for the built environment and industry covers power distribution, lighting, low-voltage systems, controls, and increasingly, EV charging and battery storage.

Discipline overview

Building electrical engineers design service entrances, switchgear, transformers, panelboards, branch circuits, lighting, fire alarm, and low-voltage telecom backbones. They produce E-sheets sealed by a P.E. and coordinate with the utility for service and metering.

Industrial electrical engineers handle medium-voltage distribution, motor control centers (MCCs), variable-frequency drives, PLC and SCADA integration, arc-flash studies, and protection coordination. They write specs to UL, IEEE, and IEC standards.

Power-system engineers focus on generation, transmission, and substation work for utilities and large industrial owners — short-circuit, load-flow, transient stability, and protection studies in tools like SKM PowerTools, ETAP, EasyPower, and PSCAD.

Process breakdown

The end-to-end design and delivery workflow on a typical project.

  1. 01

    Load calculation & service sizing

    Connected and demand load per NEC Article 220, motor schedules, future capacity. Coordinate with utility for available fault current and service voltage.

  2. 02

    Single-line diagram

    Distribution architecture, transformer sizes, generator and ATS layout, metering, harmonic mitigation.

  3. 03

    Power, lighting & low-voltage plans

    Receptacle and equipment power layouts, lighting design with photometric studies, fire alarm and telecom riser.

  4. 04

    Studies

    Short-circuit, coordination (TCC curves), and arc-flash hazard analysis per IEEE 1584 / NFPA 70E.

  5. 05

    Construction documents & spec

    Sealed E-sheets, panel schedules, switchgear elevations, equipment cut-sheet review (Division 26).

  6. 06

    Commissioning & energization

    Megger and hi-pot testing, relay testing, infrared scans, utility witness, energization sequence, and final arc-flash label updates.

Project examples

Representative engagements drawn from the discipline.

  • Hyperscale data center

    Scope: 60 MW campus, 2N redundant distribution, on-site substation, generator yard, lithium-ion UPS.

    Outcome: Achieved Uptime Institute Tier IV; PUE design point 1.15.

  • Public school renovation

    Scope: Service upgrade from 800 A to 2000 A, LED retrofit, fire alarm replacement, classroom AV power.

    Outcome: Delivered over a summer shutdown; passed AHJ first inspection.

  • Refinery MCC modernization

    Scope: Replacement of 1970s 5 kV MCCs with arc-resistant gear, VFDs on critical pumps, full coordination study.

    Outcome: Arc-flash incident energy reduced from 40 cal/cm² to <8 cal/cm² across the line-up.

  • Grid-tied solar + storage

    Scope: 5 MW PV with 10 MWh BESS, IEEE 1547 interconnection, utility protection settings.

    Outcome: Commissioned and energized in 14 weeks after PPOC.

Codes & standards

The reference documents the work is designed and reviewed against.

StandardIssuerScope
NEC (NFPA 70)NFPANational Electrical Code — adopted (often with amendments) in every U.S. state.
NFPA 70ENFPAStandard for Electrical Safety in the Workplace — arc-flash, shock, and PPE.
NFPA 72NFPANational Fire Alarm and Signaling Code.
NFPA 110NFPAStandard for Emergency and Standby Power Systems — generator and ATS.
IEEE 1547IEEEInterconnection of distributed energy resources with the electric power system.
IEEE 1584IEEEGuide for Performing Arc-Flash Hazard Calculations.
UL 891 / 1558ULSwitchboard and switchgear listings.

Licenses & certifications

Credentials commonly required or earned by practitioners.

  • P.E. (Electrical)
    NCEES / state boards

    Required to seal electrical drawings.

  • LC (Lighting Certified)
    NCQLP

    Specialty credential for lighting designers.

  • NETA Level III / IV
    InterNational Electrical Testing Association

    Acceptance testing of switchgear, transformers, and protective relays.

  • NABCEP PV Installation Professional
    NABCEP

    Solar PV system designers and contractors.

  • NICET Fire Alarm Levels III–IV
    NICET

    Fire alarm design and inspection.

  • CEM (Certified Energy Manager)
    AEE

    Energy auditors and lighting retrofit leads.

FAQs

What's the difference between an electrical engineer and an electrician?
Engineers design and seal drawings; electricians install and maintain the built work under those drawings. Electricians hold trade licenses (Journeyman, Master); engineers hold a P.E. license.
When is an arc-flash study required?
NFPA 70E requires that an arc-flash incident-energy analysis be performed for every facility where employees work on or near energized equipment. OSHA enforces NFPA 70E. Most owners require updated studies every 5 years or after any major distribution change.
What is a coordination study?
An analysis of upstream and downstream protective devices (breakers, fuses, relays) to make sure the device closest to a fault opens first, minimizing the part of the system that loses power. Output is a TCC (time-current curve) plot per bus.
Do utility-scale projects need state P.E. licenses?
Yes — utility substations and transmission projects still require a state-licensed P.E. of record. FERC, NERC, and IEEE standards layer on top of state licensing.
How is EV charging different from regular power design?
Mostly about load diversity, demand management, utility coordination, and metering. Level-3 DC fast chargers drive transformer sizing and may trigger demand-charge mitigation (BESS, load-shedding controls).