Combo Electric
High-voltage substation transformers at dusk
34.0522° N, 118.2437° W — Los Angeles, CA

Precision power · engineered to last

POWERING
THE CORE WITH NUMBERS.

Commercial and industrial electrical contractors for data centers and power generation — low and high voltage, engineered and installed to a lifetime guarantee.

Request Technical Consultation(310) 696-1150
Lifetime
Guarantee
Insured
& Bonded
Low + High
Voltage
LA Based
Crews

Lifetime Guarantee

Our workmanship is guaranteed for the life of the installation.

Insured & Bonded

Fully covered for commercial and industrial project exposure.

Licensed Contractor

California-licensed electrical contractor, held to code.

Los Angeles Based

Local crews serving LA and the surrounding counties.

01Capabilities

Built for facilities that cannot lose power.

Combo Electric specializes in commercial and industrial electrical work where downtime is measured in dollars per minute. One contractor, one accountable crew, from the utility service to the server rack.

01

Data Center Electrical Infrastructure

Complete power paths for colocation and enterprise halls — service entrance, distribution, PDU and rack-level delivery engineered to ride through utility loss.

02

High & Low Voltage Distribution

Medium-voltage service down to 120V branch circuits. We build and terminate the entire chain, from 4,160V switchgear to the last receptacle.

03

Power Generation & Backup

Generator paralleling, automatic transfer switches and standby power for generation plants and mission-critical facilities.

04

Switchgear, Panels & Transformers

Rigging, bus assembly, torque-to-spec terminations and insulation testing for new installs and equipment replacements.

05

Battery Storage & UPS Systems

VRLA, lithium-ion and modular UPS builds with N+1 and 2N redundancy, integrated with your monitoring platform.

06

Testing, Commissioning & Service

Megger and insulation resistance testing, torque verification and load bank runs — documented, then backed by our lifetime guarantee.

02The Phase Lab

Power is a waveform. We read it precisely.

Every service we build is a study in phase, balance and harmonic load. Below are the three distributions we engineer daily — the sine and cosine relationships that decide whether your equipment runs clean for decades or fails early.

Single-Phase

SINGLE

1 waveform · sin θ · 60 Hz

0°90°180°270°360°450°540°
sin θ

One alternating sine wave. The foundation of tenant power — 120V line-to-neutral and 240V line-to-line feeding lighting, controls, receptacles and single-phase equipment.

Dual-Phase

DUAL

3 waveforms · sin, cos, tan · 60 Hz

0°90°180°270°360°450°540°
sin θcos θtan θ

Sine and cosine — two waveforms a quarter-cycle apart — and tangent, their ratio, the phase-angle relationship that governs power factor and reactive load. We also engineer split-phase services where legs L1 and L2 sit 180° apart, doubling voltage without doubling conductor size.

Three-Phase

THREE

3 waveforms · 120° apart · 60 Hz

0°90°180°270°360°450°540°
A · 0°B · 120°C · 240°

Three waveforms spaced 120° deliver constant, balanced power. It is what drives chillers, CRAH units, pumps and 480V UPS systems — and why phase balance is engineered, never guessed.

03Voltage Ladder

From 120V branch circuits to medium voltage service.

Combo Electric works the full voltage stack — the same crew that lands a 480V feeder can trace a 120V control circuit. That range is what keeps a facility coherent from the utility transformer to the last outlet.

120V
Single-phase branch power

General lighting, receptacles, control and instrumentation circuits, IDF closets and emergency egress lighting. We balance these circuits across phases so neutral current and harmonic distortion stay in check.

Lighting controlReceptaclesLife safetyInstrumentation
240V
Single-phase, three-wire

Panelboards, HVAC condensers, small machinery, tenant fit-outs, EV chargers and dry-type step-down transformers. Split-phase legs L1 and L2 deliver 240V from the same service that gives you 120V.

HVACEV chargingTenant powerStep-down
480V+
Three-phase & medium voltage

The distribution voltage of data centers and heavy industry. Feeds chillers, CRAH units, pumps, large motors, UPS input and switchgear — with medium-voltage service to 4,160V and beyond where the utility requires it.

ChillersUPS inputMotorsMV switchgear
Switchgear and transformer distribution room
Transformers

Stepping utility power down — correctly sized, not just matched.

Dry-type and isolation transformers from 480V to 208/120V, specified for the load you actually run: K-rated for harmonic-rich server equipment, delta-wye or isolation configuration as the design requires, with thermal margin, shielding and a grounding electrode system built to code.

  • K-rated for non-linear loads
  • Isolation & harmonic mitigation
  • Neutral and grounding sized to load
  • Thermal and fault-current margin
Data center battery storage and UPS room
Battery Storage & Redundancy

Redundancy engineered so a utility sag never reaches a rack.

Battery strings, modular UPS and generator-backed power built to N+1 and 2N topologies. We monitor battery health, sequence automatic transfer, and prove runtime under load before the hall goes live — then stand behind it for the life of the installation.

  • N+1 and 2N UPS topology
  • VRLA and lithium-ion strings
  • Automatic transfer switches
  • Load bank and runtime testing
04Data Center Plans

We read the plan before we pull a single wire.

A data center electrical plan is a set of promises about redundancy, capacity and separation. Here is a typical low-voltage scope we take from drawing to commissioned system — every item coordinated with the GC, the mechanical trades and the commissioning agent.

Electrical floor plan of a data center
Typical low-voltage distribution planSHEET E-1

Every sheet is reviewed for one-line accuracy, device coordination, conduit fill, voltage drop and available fault current before mobilization. Changes that would compromise redundancy get flagged in pre-construction — not found during commissioning.

01

Utility Service & Medium-Voltage Switchgear

Incoming service, metering, main breakers and MV gear — sized with future capacity so a pod expansion never forces a service upgrade.

02

Transformers & Main Distribution

Step-down to 480V and 208/120V feeding main distribution boards, with selective coordination and arc-flash labeling from day one.

03

UPS Modules & Battery Cabinets

Double-conversion UPS with N+1 modules and monitored battery strings carrying the hall through transfer to generator.

04

Power Distribution Units

Floor-mounted or in-row PDUs delivering branch circuits to racks, metered per circuit for real capacity planning.

05

Busway & Intelligent Rack PDUs

Overhead busway drops and switched rack PDUs giving per-outlet monitoring and remote reboot at the cabinet.

06

Structured Cabling Backbone

Cat6A and OM4 fiber from MDA to HDA to rack, with labeled patch panels, dressing and certified test results handed over.

07

Cable Tray, Pathway & Containment

Overhead tray and basket pathways that keep power separated from data and tie cleanly into hot/cold aisle containment.

08

Grounding & Bonding

Telecommunications bonding backbone, grounding busbars and isolated ground reference protecting equipment and signal integrity.

09

Monitoring, Controls & Life Safety

EPMS/BMS points, leak detection, thermal sensors, lighting control and fire alarm interfaces — wired, addressed and commissioned.

Data center electrical distribution room with switchgear

Switchgear, UPS and distribution — installed, torqued, tested and commissioned by one accountable contractor.

05Selected Work

Scopes we have built, tested and energized.

A representative sample of recent data center, power generation, industrial and commercial work — with the actual service voltages, equipment ratings and coordination specs we delivered. The same plan-read, coordination and commissioning discipline applies from a single switchgear to a full white-space build-out.

Hyperscale colocation build-out — 2N UPS and generator plant
Service
4,160V / 3,000A
Redundancy
2N + N+1
IT load
3.2 MW
Timeline
14 weeks
Data Center

Hyperscale colocation build-out — 2N UPS and generator plant

Irvine, CA · 40,000 sq ft white space
MV utility tie
4,160V, 3Ø, 3-wire via 2× 2,500 kVA oil-filled transformers
Main distribution
480/277V, 4,000A MDP with 100kAIC bus & SCS coordination
UPS
2× strings 750 kVA double-conversion, N+1 modules per string
Battery
VRLA cabinets, 10-min ride-through to gen sync
Generator
2× 2 MW diesel, paralleled, soft-load transfer
PDU / busway
Overhead 400A busway, in-row 60 kVA metered PDUs
  • Medium-voltage utility tie-in and two 2,500 kVA step-down transformers feeding 480V main distribution.
  • Two (2N) double-conversion UPS strings with paralleled battery cabinets carrying the hall through transfer to generator.
  • In-row cooled 400A overhead busway and metered rack PDUs across four data halls, with per-circuit metering.
  • EPMS/BMS commissioning points, leak detection and thermal sensors wired back to a single operations dashboard.
  • Selective coordination study, arc-flash analysis and incident-energy labels delivered before energization.
  • Hot/cold aisle containment, overhead cable tray and a telecommunications bonding backbone to TIA-942.
Standby generation plant for a regional hospital campus
Generators
2 × 1 MW
Voltage
480V / 3Ø
Transfer
Closed-transition ATS
Code
NFPA 110 / CEC 700
Power Generation

Standby generation plant for a regional hospital campus

Los Angeles, CA · 2 MW diesel + paralleling
Gensets
2× 1,000 kW, 1,250 kVA, 480V @ 0.8 PF
Paralleling
Synchronizing switchgear, load-demand control
ATS
4,000A closed-transition, soft-load (no-break)
Fuel
Dual-wall 8,000 gal sub-base tanks, 96-hr run
Black start
Battery + charger, 10-sec start sequence
Relaying
27/59/81/32/46, utility interlock per IEEE 1547
  • Two 1 MW standby gensets with synchronizing switchgear and automatic load-step sequencing.
  • Closed-transition transfer with soft-load controls for no-break switchover to utility.
  • Black-start capability and monthly load-bank testing for NFPA 110 Level 1 compliance.
  • Utility interlock and protective relaying (27/59/81/32/46) coordinated with the serving utility.
  • Dual-wall sub-base fuel tanks sized for 96 hours of rated standby operation.
  • Life-safety and critical branch distribution to OR, ICU and imaging suites per CEC Article 700.
Manufacturing facility 480V power upgrade and arc-flash program
Capacity
3,000 A
Voltage
480/277V
Arc-flash
Cat 2 / PPE
Motors
12 × VFD
Industrial

Manufacturing facility 480V power upgrade and arc-flash program

Vernon, CA · 120,000 sq ft plant
Service
480/277V, 3Ø, 4W, 3,000A main
Switchgear
3,000A main + 6 motor control centers
AIC rating
65kAIC with fully rated OCPD
VFDs
12× 50–200 HP drives, line reactors, harmonic mitigation
Metering
Branch-circuit metering, MODBUS to SCADA
Coordination
TCC study, Cat 2 incident energy at MCC
  • New 3,000 A main distribution board replacing aging switchgear, sized for 25% growth.
  • Six motor control centers with twelve variable-frequency drives on process lines, each with line reactors.
  • Coordinated protective device (TCC) study and updated arc-flash labels at every MCC and panel.
  • Power monitoring with branch-circuit metering at every load panel, reported to plant SCADA over MODBUS.
  • Harmonic study and mitigation to keep THD within IEEE 519 at the point of common coupling.
  • Power factor correction capacitors with detuning reactors and ground-fault protection on feeders.
High-rise office tower tenant build-out and core power
Service
2,000 A
Voltage
208/120V
Floors
32
Title 24
Compliant
Commercial

High-rise office tower tenant build-out and core power

Downtown Los Angeles, CA · 32 floors
Service
208/120V, 3Ø, 4W, 2,000A from basement switchgear
Risers
3× 600A busway risers, tenant taps per floor
Metering
Tenant sub-metering, revenue-grade (ANSI C12.20)
Emergency
Fire pump, egress lighting, 700 ATS branches
Lighting
Daylight harvesting, 0-10V dimming, BACnet
Acceptance
Title 24 NRCC acceptance testing certified
  • Core service risers and house power distribution through 32 floors via 600A busway with floor taps.
  • Tenant build-outs with revenue-grade sub-metering and per-suite branch panel schedules.
  • Emergency lighting, fire pump controller and life-safety transfer schemes per CEC Article 700.
  • Lighting control system with daylight harvesting, 0-10V dimming and BACnet integration to BMS.
  • Title 24 nonresidential acceptance testing documented and certified at commissioning.
  • Telecom grounding, UPS-backed IT closets and PDU feeds to each MDF/IDF.
06Workmanship

Unprecedented workmanship is a standard, not a slogan.

Anyone can pull wire. What separates an installation that lasts thirty years from one that fails in three is craftsmanship you can inspect — and a contractor willing to guarantee it in writing.

Lifetime Guarantee

Combo Electric stands behind its workmanship for the life of the installation. Licensed, insured and bonded in California.

Macro view of copper busbars and terminations
01

Terminations done once, done right

Torque values recorded, lugs matched to conductor class, insulation tested before energization. The details that cause hot spots are the details we document.

02

Nothing hidden behind a wall

Every circuit is labeled, every panel schedule delivered, every as-built marked up. Your next contractor will know exactly what they are walking into.

03

A lifetime guarantee we can stand behind

Because we install to spec the first time, we can guarantee the workmanship for the life of the installation — insured, bonded and accountable.

Power generation turbine hall
Power Generation

Prime and standby power — from generator paralleling to plant distribution.

07Command Center

Tell us what you're powering.

Send over the scope, the plan set or just the problem. We will respond with a technical read and a clear next step.

Direct line
(310) 696-1150
Stationed in
Los Angeles, California
Availability
Mon–Sat · Emergency service

Insured · Bonded · Lifetime Guarantee

We use cookies to understand how the site is used and to improve it. Essential cookies keep the site working; analytics run only with your consent. See our Privacy Policy.