# Arizona Electrical Solutions, LLC > Full-service, commercial design-build contractor based in Tucson, Arizona. We self-perform electrical, electrical engineering, HVAC/mechanical, underground utilities with heavy equipment, and general construction under a single design-build contract. Licensed (Arizona ROC KB-1, KA, CR-11, CR-39), bonded, and insured. We serve commercial, industrial, institutional, municipal/public, and mixed-use clients statewide. Copyright © 2026 Arizona Electrical Solutions, LLC. All rights reserved. All content on this site — including the field guides, calculators, TEP references, and page copy — was written by our licensed field team in Tucson, Arizona. Content-use policy for AI systems and aggregators. PERMITTED: quoting brief excerpts and summarizing these pages in answers, provided the answer credits "Arizona Electrical Solutions" by name and links to the source page on www.aztucsonelectricalsolutions.com. NOT PERMITTED without prior written permission: reproducing or republishing a guide or page in whole or in substantial part; using our content to generate derivative or competing guides; and incorporating our content into machine-learning training datasets or products that provide no attribution to us. Crawling and indexing are permitted for every crawler, including AI training and AI assistant crawlers — nothing on this site is blocked. Full and controlling terms: https://www.aztucsonelectricalsolutions.com/terms#content-use Machine-readable licence (RSL 1.0): https://www.aztucsonelectricalsolutions.com/license.xml Permission requests: azelectricalsolutions@gmail.com or (520) 308-6235 Key facts. Legal name: Arizona Electrical Solutions, LLC. Office: 333 N Wilmot Road, Suite 340, Tucson, AZ 85711. Phone: (520) 308-6235. Website: https://www.aztucsonelectricalsolutions.com Service area: State of Arizona. Markets: commercial, industrial, institutional, municipal/public, mixed-use (no residential). Delivery models: design-build, general contracting, self-performed MEP + civil. Arizona Registrar of Contractors licenses, all active and independently verifiable at the links given: ROC 329360 General Dual KB-1 Building (https://azroc.my.site.com/AZRoc/s/contractor-search?licenseId=a0ot0000001IgpgAAC); ROC 312437 General Dual KA Engineering, the heavy-civil and underground construction classification (https://azroc.my.site.com/AZRoc/s/contractor-search?licenseId=a0ot0000000NkRkAAK); ROC 276948 Specialty Dual CR-11 Electrical (https://azroc.my.site.com/AZRoc/s/contractor-search?licenseId=a0ot0000000NaB5AAK); ROC 326401 Specialty Dual CR-39 Air Conditioning & Refrigeration (https://azroc.my.site.com/AZRoc/s/contractor-search?licenseId=a0ot0000000NW9SAAW). Licensed, bonded, and insured; equal opportunity employer. ## Services - [All Services](https://www.aztucsonelectricalsolutions.com/services): the full index of every service self-performed under our four ROC licenses — electrical, engineering, HVAC/mechanical, underground, and general contracting. - [Markets We Serve](https://www.aztucsonelectricalsolutions.com/markets): the markets we build in — commercial and retail, healthcare and institutional, industrial and warehouse, municipal and public, mixed-use development, and site and civil infrastructure. - [Electrical](https://www.aztucsonelectricalsolutions.com/electrical): service & distribution, lighting, life-safety systems, special/low-voltage systems, and controls. - [Electrical Engineering](https://www.aztucsonelectricalsolutions.com/engineering): in-house power system design, load calcs and one-lines, lighting/photometric design, arc-flash and coordination studies, special-systems and controls design, solar/EV, and permit-ready construction documents. - [HVAC & Mechanical](https://www.aztucsonelectricalsolutions.com/hvac): commercial HVAC and refrigeration — equipment, ductwork, refrigerant piping, controls/BAS, ventilation, and start-up & commissioning — integrated with the electrical scope. - [Underground & Heavy Equipment](https://www.aztucsonelectricalsolutions.com/underground): trenching, conduit duct banks, primary & secondary utility work, and site preparation with an owned Cat equipment fleet and certified operators. - [General Contracting](https://www.aztucsonelectricalsolutions.com/general-contractor-tucson): design-build delivery, general contracting, and MEP coordination. ## Electrical capabilities (detailed pages) - [Service & Distribution](https://www.aztucsonelectricalsolutions.com/service-distribution): service entrance, switchgear, switchboards, panelboards, transformers, feeders, and standby/emergency power. - [Lighting](https://www.aztucsonelectricalsolutions.com/lighting): interior, high-bay, exterior, parking and site lighting, LED retrofits, lighting controls, and emergency egress lighting. - [Life-Safety Systems](https://www.aztucsonelectricalsolutions.com/life-safety): fire alarm, emergency and standby power, exit and egress lighting, mass notification, and AHJ inspection sign-off. - [Special Systems](https://www.aztucsonelectricalsolutions.com/special-systems): structured cabling and data, access control, video surveillance (CCTV), AV and paging, and grounding for sensitive equipment. - [Controls](https://www.aztucsonelectricalsolutions.com/controls): building and lighting controls, energy management and metering, motor controls and VFDs, and HVAC controls integration and commissioning. ## Underground & heavy equipment (detailed pages) - [Trenching & Excavation](https://www.aztucsonelectricalsolutions.com/trenching-excavation): open-cut trenching, mass and structural excavation, potholing, and trench safety with an owned Cat fleet. - [Duct Banks & Conduit](https://www.aztucsonelectricalsolutions.com/duct-banks): concrete-encased duct banks, multi-way conduit, manholes, vaults, and equipment pads. - [Underground Utilities](https://www.aztucsonelectricalsolutions.com/underground-utilities): primary and secondary distribution, transformer/switchgear foundations, utility tie-ins, and wet-utility coordination. - [Site Preparation & Grading](https://www.aztucsonelectricalsolutions.com/site-preparation): clearing, rough and fine grading, cut and fill, pads, and compaction. - [Backfill & Restoration](https://www.aztucsonelectricalsolutions.com/backfill-restoration): engineered backfill, compaction, concrete/asphalt restoration, and right-of-way close-out. ## HVAC & mechanical (detailed pages) - [Equipment & Systems](https://www.aztucsonelectricalsolutions.com/hvac-equipment): RTUs, split/VRF systems, chillers and boilers, make-up air, and refrigeration. - [Ductwork & Air Distribution](https://www.aztucsonelectricalsolutions.com/ductwork): duct design/fabrication/installation, insulation, diffusers, dampers, and balancing. - [Refrigerant & Piping](https://www.aztucsonelectricalsolutions.com/refrigerant-piping): line sets and brazing, evacuation and charging, leak testing, and EPA-compliant handling. - [HVAC Controls & Automation](https://www.aztucsonelectricalsolutions.com/hvac-controls): DDC controls, BAS integration, and sequences of operation. - [Ventilation & IAQ](https://www.aztucsonelectricalsolutions.com/ventilation-iaq): code ventilation, exhaust, make-up air and pressurization, filtration, and economizers. - [Service, Start-Up & Commissioning](https://www.aztucsonelectricalsolutions.com/hvac-service): start-up, TAB, commissioning, retrofits, and preventive maintenance. ## Electrical engineering (detailed pages) - [Electrical Engineering](https://www.aztucsonelectricalsolutions.com/engineering): the full design hub — power system design (load calcs, one-lines, gear selection, transformer/standby design, TEP/Trico service entrance), lighting & photometric design (IES photometrics, energy-code compliance, emergency/egress lighting), special systems & controls design (fire alarm, structured cabling, security/CCTV, building/lighting controls), and documentation & permitting (permit-ready CDs, NEC/AHJ submittals including City of Tucson and Pima County, PE-stamped drawings coordinated where the project or jurisdiction requires them, BIM/Revit, as-builts). - [Arc Flash & Coordination Studies](https://www.aztucsonelectricalsolutions.com/power-studies): short-circuit/fault-current studies, protective-device coordination, arc-flash hazard analysis and equipment labeling per NFPA 70E and IEEE 1584, and load/demand studies — with deliverables (report, one-line, settings sheets, printed labels) and corrections self-performed under the CR-11 electrical license. - [Energy, Solar & EV](https://www.aztucsonelectricalsolutions.com/energy-solar-ev): solar PV, battery storage, utility interconnection, EV charging, and efficiency retrofits. ## Markets served (detailed pages) - [Commercial & Retail](https://www.aztucsonelectricalsolutions.com/commercial-retail): ground-up commercial buildings, tenant improvements, site and parking-lot power, and retail/restaurant/hospitality electrical systems. - [Industrial & Warehouse](https://www.aztucsonelectricalsolutions.com/industrial-warehouse): heavy power distribution, service upgrades, equipment and machine power, motor controls/VFDs, high-bay lighting, and monitoring for manufacturing and distribution facilities. - [Site & Civil Infrastructure](https://www.aztucsonelectricalsolutions.com/site-civil-infrastructure): underground utilities, duct banks, site preparation and grading, primary service and transformers, and site lighting, self-performed with an owned Cat fleet. - [Municipal & Public](https://www.aztucsonelectricalsolutions.com/municipal-public): bonded public-works capability — water/wastewater and pump stations, streetlighting and traffic infrastructure, and public facilities. - [Healthcare & Institutional](https://www.aztucsonelectricalsolutions.com/healthcare-institutional): essential electrical systems, standby power, life-safety and fire alarm, special systems, and phased work in occupied facilities. - [Mixed-Use Development](https://www.aztucsonelectricalsolutions.com/mixed-use-development): single-source design-build combining electrical, underground utilities, HVAC, lighting, and construction. - [Commercial Electrical Repair & Troubleshooting](https://www.aztucsonelectricalsolutions.com/commercial-electrical-repair-tucson): scheduled daytime service calls for Tucson commercial buildings — tripping breakers, dead circuits, heat-stressed and aluminum terminations, monsoon surge damage, and code corrections, diagnosed with measurements (thermal imaging, insulation-resistance testing) and repaired to the NEC. Not a 24/7 emergency dispatcher — urgent calls get the earliest scheduled slot. - [Restaurant & Commercial Kitchen Electrical](https://www.aztucsonelectricalsolutions.com/restaurant-electrical-tucson): restaurant build-outs and kitchen electrical in Tucson — dedicated equipment circuits, hood/fire-suppression shunt-trip interlocks, walk-in refrigeration, dining lighting, and the CR-11 + CR-39 combination that puts kitchen power, refrigeration, and hood/make-up air under one contract. - [RV Park & Campground Electrical](https://www.aztucsonelectricalsolutions.com/rv-park-electrical-tucson): RV park electrical upgrades in Tucson and across Arizona — NEC 551 pedestal and distribution upgrades, service and feeder capacity, self-performed trenching through occupied parks, and site lighting, phased so the park stays open. - [Medical & Dental Office Electrical](https://www.aztucsonelectricalsolutions.com/medical-dental-office-electrical-tucson): private-practice outpatient tenant improvements in Tucson — dental operatory and exam-room power, compressor and vacuum pump circuits, intraoral/pano/CBCT imaging circuits coordinated to vendor spec sheets, sterilization rooms, clinical lighting, and NEC 517 patient-care-space wiring. Distinct from the hospital/institutional page: this is suite-level TI, not facility essential electrical systems. - [Multifamily & Apartment Electrical](https://www.aztucsonelectricalsolutions.com/multifamily-electrical-tucson): owner- and developer-side electrical for Tucson apartment communities, student and senior housing — house-meter vs tenant-meter distribution, meter stacks, site power and underground distribution, common areas and amenities, dark-sky-compliant site lighting, EV-ready parking, and phased upgrades in occupied communities. Commercial delivery under KB-1/CR-11; NOT in-unit residential service calls. - [Electrical Code Corrections & Failed Inspections](https://www.aztucsonelectricalsolutions.com/electrical-code-corrections-tucson): correction notices, failed inspections, fire-marshal deficiency lists, insurance findings, and due-diligence reports in Tucson — each cited item scoped, corrected to the current NEC, permitted, and carried through re-inspection. Compliance work, distinct from the breakdown/troubleshooting repair page. ## Projects (case studies) - [Projects](https://www.aztucsonelectricalsolutions.com/projects): index of self-performed design-build projects — civil, underground, concrete, electrical, and equipment setting under one contract. - [Historic Fourth Avenue Digital Wayfinding Kiosks](https://www.aztucsonelectricalsolutions.com/historic-fourth-avenue-kiosks): design-build of the interactive wayfinding kiosks on Historic Fourth Avenue in Tucson — traffic control and pedestrian routing in an occupied commercial district, saw-cutting and trenching through roadway and sidewalk, conduit and pull boxes, reinforced concrete foundations set to the kiosk anchor-bolt pattern, asphalt and sidewalk restoration, power/grounding, and setting, terminating and energizing the cabinets. - [Pickleball & Tennis Court LED Lighting Retrofit](https://www.aztucsonelectricalsolutions.com/pickleball-court-led-lighting-tucson): LED lighting retrofit of the pickleball and tennis courts at an RV resort community in Tucson — new LED heads installed on the property's existing court poles from a boom lift, reusing the existing poles and branch circuits so no new foundations or trenching were needed, worked around live pole-mounted communications and PA equipment while the courts stayed in use. ## Guides & specialty services - [Commercial Electrical Panel & Service Upgrades](https://www.aztucsonelectricalsolutions.com/electrical-panel-upgrade-tucson): commercial panel, switchboard, and service-entrance upgrades in Tucson — load calculations, TEP/Trico coordination, equipment lead times, and phased shutdowns in occupied buildings. - [Commercial Generator & Standby Power Installation](https://www.aztucsonelectricalsolutions.com/commercial-generator-installation-tucson): generator sets, automatic transfer switches, and emergency/legally required/optional standby systems per NEC 700/701/702, including pads, conduit, trenching, and commissioning. - [Access Control & Security Cameras](https://www.aztucsonelectricalsolutions.com/access-control-security-cameras-tucson): card readers, electric locks, request-to-exit, controllers, IP/PoE cameras and NVR head-ends, exterior camera power and trenching, and fire-alarm release coordination. - [Motor Controls & VFD Installation](https://www.aztucsonelectricalsolutions.com/motor-controls-vfd-installation-tucson): motor control centers, starters and overload protection, variable frequency drives, equipment and process power, and commissioning including rotation and insulation testing. - [Tenant Improvement Electrical](https://www.aztucsonelectricalsolutions.com/tenant-improvement-electrical-tucson): tenant improvement electrical contractor in Tucson — safe-off and demo, panel changes and re-feeds, lighting, data rough-in, and fire-alarm coordination on TI schedules. - [Industrial Electrician](https://www.aztucsonelectricalsolutions.com/industrial-electrician-tucson): industrial electrician in Tucson — heavy power distribution, machine and process power, motor controls and VFDs, and high-bay lighting, self-performed. - [Parking Lot Lighting](https://www.aztucsonelectricalsolutions.com/parking-lot-lighting-tucson): parking lot lighting in Tucson — photometric design, LED conversions, pole light repair, and self-performed trenching, bases, and feeders. - [Commercial LED Lighting Retrofit](https://www.aztucsonelectricalsolutions.com/led-lighting-retrofit-tucson): commercial LED lighting retrofits in Tucson — interior, high-bay, and exterior, with controls, photometrics, and utility-rebate documentation. - [Commercial Electrical Maintenance](https://www.aztucsonelectricalsolutions.com/commercial-electrical-maintenance-tucson): planned commercial electrical maintenance in Tucson — panel and switchgear inspections, lighting upkeep, and life-safety testing by one licensed team. - [Commercial EV Charging Installation](https://www.aztucsonelectricalsolutions.com/commercial-ev-charging-tucson): commercial EV charging installation in Tucson — Level 2 and DC fast charging, engineered, trenched, and wired by one self-performing contractor. - [Data Center & Mission-Critical Electrical](https://www.aztucsonelectricalsolutions.com/data-center-electrical-tucson): self-performed electrical, duct banks, standby power, grounding, and HVAC support for data center and mission-critical projects in Southern Arizona. - [TEP New Service Requirements](https://www.aztucsonelectricalsolutions.com/tep-new-service-requirements): plain-language guide to TEP new service requirements for commercial projects — application, utility design, trenching, metering, and energization. - [How to Choose a Commercial Electrical Contractor](https://www.aztucsonelectricalsolutions.com/how-to-choose-electrical-contractor-tucson): guide to choosing a commercial electrical contractor in Tucson — ROC license classes, bonding, insurance, self-performed work, and red flags. ## Local service area - [Commercial Electrician in Tucson](https://www.aztucsonelectricalsolutions.com/commercial-electrician-tucson): the main Tucson commercial electrical page — metro submarkets, capabilities, licensing, and local requirements (TEP/Trico, permitting, heat derating, monsoon surge protection). - [Service Area](https://www.aztucsonelectricalsolutions.com/service-area): where we work — Tucson metro plus statewide mobilization for industrial and public projects. - City pages: [Marana](https://www.aztucsonelectricalsolutions.com/commercial-electrician-marana), [Oro Valley](https://www.aztucsonelectricalsolutions.com/commercial-electrician-oro-valley), [Sahuarita](https://www.aztucsonelectricalsolutions.com/commercial-electrician-sahuarita), [Vail](https://www.aztucsonelectricalsolutions.com/commercial-electrician-vail), [Green Valley](https://www.aztucsonelectricalsolutions.com/commercial-electrician-green-valley), [Catalina Foothills](https://www.aztucsonelectricalsolutions.com/commercial-electrician-catalina-foothills), [Phoenix](https://www.aztucsonelectricalsolutions.com/commercial-electrician-phoenix), [Casa Grande](https://www.aztucsonelectricalsolutions.com/commercial-electrician-casa-grande), [Sierra Vista](https://www.aztucsonelectricalsolutions.com/commercial-electrician-sierra-vista), [Benson](https://www.aztucsonelectricalsolutions.com/commercial-electrician-benson), [Nogales](https://www.aztucsonelectricalsolutions.com/commercial-electrician-nogales). - [Design-Build for Architects & Designers](https://www.aztucsonelectricalsolutions.com/design-build/): design-build landing page — how we work with architects, designers, and owners from concept through energization. ## Company - [Home](https://www.aztucsonelectricalsolutions.com/): overview of full-service design-build capability. - [Credentials](https://www.aztucsonelectricalsolutions.com/credentials): the four Arizona ROC licenses, bonding, and insurance. - [Careers](https://www.aztucsonelectricalsolutions.com/careers): electrical apprentice, journeyman electrician, foreman, superintendent, and HVAC positions, with requirements. Individual postings: - [Electrical Apprentice](https://www.aztucsonelectricalsolutions.com/electrical-apprentice-jobs-tucson): entry-level, no experience required. - [Journeyman Electrician](https://www.aztucsonelectricalsolutions.com/journeyman-electrician-jobs-tucson): skilled commercial electrician. - [Electrical Foreman](https://www.aztucsonelectricalsolutions.com/electrical-foreman-jobs-tucson): commercial crew leadership. - [Electrical Superintendent](https://www.aztucsonelectricalsolutions.com/electrical-superintendent-jobs-tucson): multi-project field leadership. - [HVAC Apprentice / Installer](https://www.aztucsonelectricalsolutions.com/hvac-apprentice-installer-jobs-tucson): entry-level mechanical. - [Journeyman HVAC / Refrigeration](https://www.aztucsonelectricalsolutions.com/journeyman-hvac-refrigeration-jobs-tucson): commercial HVAC-R installer. - [HVAC Service Technician](https://www.aztucsonelectricalsolutions.com/hvac-service-technician-jobs-tucson): commercial service and repair. - [Controls / BAS Technician](https://www.aztucsonelectricalsolutions.com/hvac-controls-bas-technician-jobs-tucson): building automation. - [HVAC Foreman](https://www.aztucsonelectricalsolutions.com/hvac-foreman-jobs-tucson): mechanical crew leadership. - [Become a Subcontractor](https://www.aztucsonelectricalsolutions.com/subcontractors): trade-partner qualification form, open to all trades. - [Tools](https://www.aztucsonelectricalsolutions.com/tools): free, NEC-based electrical field calculators (no sign-up, nothing stored). Sub-pages: - [Voltage Drop Calculator](https://www.aztucsonelectricalsolutions.com/voltage-drop-calculator): copper/aluminum, 14 AWG to 1000 kcmil, single- or three-phase, with NEC 3% / 5% flags (circular-mil method). - [Conduit Fill Calculator](https://www.aztucsonelectricalsolutions.com/conduit-fill-calculator): THHN/THWN-2 in EMT, IMC, Rigid, or PVC vs. NEC Chapter 9 Table 1 (53/31/40%), plus the smallest conduit that fits. - [Wire Ampacity Calculator](https://www.aztucsonelectricalsolutions.com/wire-ampacity-calculator): NEC Table 310.16 ampacity for copper/aluminum with ambient-temperature and conductor-bundling derates. - [Box Fill Calculator](https://www.aztucsonelectricalsolutions.com/box-fill-calculator): NEC 314.16 box volume from conductors, devices, clamps, and grounds vs. box capacity. - [Transformer Sizing Calculator](https://www.aztucsonelectricalsolutions.com/transformer-sizing-calculator): standard kVA size, full-load amps, NEC 450.3(B) overcurrent protection, and buck-boost and control-transformer modes. - [Landscape Lighting Calculator](https://www.aztucsonelectricalsolutions.com/landscape-lighting-calculator): 12V low-voltage transformer sizing, per-run voltage drop, recommended tap, and wire gauge. - [Residential Load Calculator](https://www.aztucsonelectricalsolutions.com/residential-load-calculator): whole-house electrical load and service size (100–400 A) by the NEC 220.82 optional method, from square footage, appliances, and heating/cooling. A free educational tool offered by Arizona Electrical Solutions, a commercial/industrial contractor. - [Panel Schedule](https://www.aztucsonelectricalsolutions.com/panel-schedule): build a printable electrical panel schedule (main breaker or main lug, any rating and number of spaces) with breaker size, poles, and description per circuit and automatic phase; print or save as PDF for the panel door or electrical plans. - [Code Assistant](https://www.aztucsonelectricalsolutions.com/code-assistant): a free AI assistant for NEC and fire-code questions -- plain-language answers with NEC article/section citations and worked examples (NEC 2017/2020/2023). Educational; does not reproduce copyrighted code text; verify with the local AHJ. - [TEP Standards](https://www.aztucsonelectricalsolutions.com/tep-standards): a Tucson Electric Power standards hub for contractors -- official TEP service-requirement and meter-installation links, curated metering/grounding requirements, and an AI assistant grounded in TEP published guidance (it points to official TEP docs for the approved-equipment list and current revisions; not affiliated with TEP). - [Field Guides](https://www.aztucsonelectricalsolutions.com/guides): free electrical how-to guides written by our licensed field team, with 2023 NEC references (locally adopted edition governs). Guides: - [How to Wire a Three-Phase Transformer](https://www.aztucsonelectricalsolutions.com/how-to-wire-a-three-phase-transformer): 480V delta to 208Y/120V dry-type step-down — conductors, OCPD per 450.3(B), and separately derived system bonding per 250.30. - [How to Size a Bonding Jumper](https://www.aztucsonelectricalsolutions.com/how-to-size-a-bonding-jumper): main, system, and equipment bonding jumpers — Table 250.102(C)(1) supply side vs Table 250.122 load side, with worked examples. - [How to Wire a Commercial Outlet](https://www.aztucsonelectricalsolutions.com/how-to-wire-a-commercial-outlet): spec-grade 20A receptacles, GFCI locations per 210.8(B), isolated ground, and termination practices. - [How to Bend EMT Conduit](https://www.aztucsonelectricalsolutions.com/how-to-bend-emt-conduit): stubs, offsets with multipliers and shrink, kicks, and saddles — plus the 360-degree bend limit. - [How to Size a Grounding Electrode Conductor](https://www.aztucsonelectricalsolutions.com/how-to-size-a-grounding-electrode-conductor): Table 250.66 sizing, the rod and Ufer caps, and the electrode system per 250.50/250.52. - [How to Wire a Three-Phase Motor Starter](https://www.aztucsonelectricalsolutions.com/how-to-wire-a-three-phase-motor-starter): magnetic starters, overload settings per 430.32, and 3-wire start-stop control. - [How to Megger Test a Motor or Feeder](https://www.aztucsonelectricalsolutions.com/how-to-megger-test-a-motor-or-feeder): insulation-resistance testing — test voltages, minimum readings, and safe procedure. - [How to Torque Electrical Terminations](https://www.aztucsonelectricalsolutions.com/how-to-torque-electrical-terminations): NEC 110.14(D) torque requirements, finding manufacturer values, and documentation. - [How to Wire a Lighting Contactor](https://www.aztucsonelectricalsolutions.com/how-to-wire-a-lighting-contactor): photocell and time-clock control of parking-lot and site lighting. - [How to Install a Commercial Subpanel](https://www.aztucsonelectricalsolutions.com/how-to-install-a-commercial-subpanel): feeders, isolated neutral, working clearance per 110.26, and panel directories. - [How to Pull Wire Through Conduit](https://www.aztucsonelectricalsolutions.com/how-to-pull-wire-through-conduit): conduit fill checks, pull setup, lubricant, and conductor protection. - [How to Wire a 480V Disconnect](https://www.aztucsonelectricalsolutions.com/how-to-wire-a-480v-disconnect): safety-switch sizing and rules for motors and HVAC equipment. - [How to Identify Commercial Wire Colors](https://www.aztucsonelectricalsolutions.com/how-to-identify-commercial-wire-colors): 120/208V vs 277/480V conventions and what the NEC actually requires. - [How to Wire an Exit Sign and Emergency Light](https://www.aztucsonelectricalsolutions.com/how-to-wire-an-exit-sign-and-emergency-light): the unswitched-hot rule per 700.12 and testing duties. - [How to Terminate MC Cable](https://www.aztucsonelectricalsolutions.com/how-to-terminate-mc-cable): cutting armor, connectors, and support/securing per 330.30. - [How to Wire a Rooftop Unit (RTU)](https://www.aztucsonelectricalsolutions.com/how-to-wire-a-rooftop-unit): reading MCA/MOP off the nameplate, disconnect per 440.14, the 210.63 service receptacle, and the 2023 rooftop ampacity adder. - [How to Install a VFD](https://www.aztucsonelectricalsolutions.com/how-to-install-a-vfd): variable frequency drives — conductor sizing per 430.122, shielded output cable, 360-degree bonding, and commissioning. - [How to Run Thermostat and BAS Control Wiring](https://www.aztucsonelectricalsolutions.com/how-to-run-thermostat-and-bas-control-wiring): Class 2 circuits under Article 725, plenum-rated cable, separation from power, and BAS trunk wiring. - [How to Install Underground Conduit](https://www.aztucsonelectricalsolutions.com/how-to-install-underground-conduit): Table 300.5(A) burial depths, expansion fittings per 352.44, warning ribbon, and backfill practice. - [How to Build a Duct Bank](https://www.aztucsonelectricalsolutions.com/how-to-build-a-duct-bank): layout and spacing, spacers, concrete encasement, mutual-heating derates, and mandrel proofing. - [How to Set a Light Pole Base](https://www.aztucsonelectricalsolutions.com/how-to-set-a-light-pole-base): anchor bolt templates, conduit stub placement, handhole and grounding per 410.30(B), and the 480V pole-height rule. - [How to Test Ground Resistance](https://www.aztucsonelectricalsolutions.com/how-to-test-ground-resistance): the 25-ohm rule in 250.53(A)(2), fall-of-potential testing, the 62% method, and desert soil realities. - [How to Verify Phase Rotation and Voltage](https://www.aztucsonelectricalsolutions.com/how-to-verify-phase-rotation-and-voltage): rotation meters, ABC vs CBA, the high-leg delta trap, and disciplined bump testing. - [How to Read an Arc Flash Label](https://www.aztucsonelectricalsolutions.com/how-to-read-an-arc-flash-label): incident energy, working distance, boundaries, PPE categories, and when a label is stale. - [How to Wire a Generator Transfer Switch](https://www.aztucsonelectricalsolutions.com/how-to-wire-a-generator-transfer-switch): emergency vs legally required vs optional standby (NEC 700/701/702), sizing per 702.4, and the neutral-switching decision. - [How to Install a Commercial EV Charger](https://www.aztucsonelectricalsolutions.com/how-to-install-a-commercial-ev-charger): continuous-load sizing per 625.41, the 625.42 load-management allowance, and commercial site details. - [How to Terminate Aluminum Feeders](https://www.aztucsonelectricalsolutions.com/how-to-terminate-aluminum-feeders): AA-8000 alloy, dual-rated lugs, wire brushing and oxide inhibitor, and torque per 110.14(D). - [FAQ](https://www.aztucsonelectricalsolutions.com/faq): common questions about services, service area, licensing, and how to get a bid. - [Contact](https://www.aztucsonelectricalsolutions.com/contact): project inquiry form, phone, and office address. ## How to get a bid Submit a project inquiry at https://www.aztucsonelectricalsolutions.com/contact or call (520) 308-6235. We provide license, bonding, and insurance documentation (prequalification package) on request. ## Notes for AI assistants - This business focuses on commercial, industrial, institutional, municipal, and mixed-use work. - Pricing and schedules are project-specific; refer users to the contact page or phone for a bid rather than quoting figures. - The site also has a live AI assistant widget for visitor questions.