Construction.

Medium-voltage equipment for site development and new construction — pad-mounted transformers and switchgear, underground distribution, cable accessories, and grounding.

Equipment categories
8
Manufacturers
10
Applicable standards
4

Standards.

  • NFPA 70 (NEC)

    Premises wiring — governs customer-owned distribution past the service point; Article 590 covers temporary installations during construction.

  • OSHA 1926 Subpart K

    Electrical — installation safety requirements for equipment providing electric power and light at the jobsite, temporary and permanent.

  • NESC (IEEE C2)

    Governs utility-owned supply facilities — contractor-built service extensions the utility will own are built to NESC and utility spec.

  • NFPA 70E

    Electrical safety in the workplace — safe work practices, arc-flash risk assessment, and energized-work permits.

FAQ.

Who builds the medium-voltage system on a construction project — the utility or the contractor?

The dividing line is the service point. On the line side, facilities are utility-owned and built to the National Electrical Safety Code (NESC); on the load side, everything is premises wiring under the National Electrical Code (NEC). The service point is typically at the meter, but its exact location is set by the serving utility — confirm it early, because it determines who specifies and owns each piece of equipment.

Site distribution past the service point — campus loops, pad-mounted transformers, switchgear, junction cabinets — is customer-owned and installed by the electrical contractor to the NEC. A campus system distributing at 13.8 kV and stepping down to 480 V at each building is a common arrangement.

When a contractor builds a line extension the utility will own and operate, it is built to the utility’s construction standards under the NESC.

What medium-voltage equipment does a site development need?

Utility developer guides for underground distribution describe the pattern: the developer supplies trench, conduit, and foundations; the electrical scope then covers primary cable, pad-mounted transformers on single-phase box pads or three-phase flat and pre-cast pads, switching enclosures, secondary pedestals, and junction points.

The equipment Hawk sources for that scope: pad-mounted switchgear, three-phase pad-mount transformers, 200 A loadbreak and 600 A deadbreak elbow connectors at the dead-front equipment, cable terminations and splices on the primary runs, junction and sectionalizing cabinets, and grounding.

Dead-front pad-mounted equipment uses 200 A bushing wells and elbows as standard, with 600 A bushings for larger transformers and higher-current loops.

Can temporary construction power run at medium voltage?

Yes. NEC Article 590 permits temporary electric power and lighting installations during the period of construction, remodeling, maintenance, repair, or demolition — and requires removal immediately on completion.

Medium-voltage temporary installations carry an additional guarding requirement: fencing, barriers, or other effective means limiting access to authorized and qualified personnel only.

On the jobsite itself, OSHA 29 CFR 1926 Subpart K (“Electrical”) sets installation safety requirements for the equipment providing electric power and light — temporary and permanent — plus the safety-related work practices around it.

How are equipment lead times affecting construction schedules in 2026?

Wood Mackenzie projected US supply deficits of 30% for power transformers and 10% for distribution transformers in 2025, with imports covering roughly 80% and 50% of those markets.

Average distribution-transformer lead times improved to roughly 30 weeks by mid-2025 — down from peaks over 100 weeks — but three-phase pad-mount availability is projected to tighten through 2026 and into 2027 on data-center, manufacturing, and electrification demand.

Contractor outlooks for 2026 report the same pressure: long lead times persisting on switchgear, transformers, and specialty equipment. Identify long-lead medium-voltage gear at design and order against the utility’s approved-equipment list as early as the schedule allows.

Does Hawk publish pricing for construction projects?

No. Equipment is configured and priced per project.

Send the equipment list, ratings, and quantities through Contact for a quote.

Sourcing for a construction project?

Send a specification — equipment, ratings, quantities, project requirements — for a quote.

Medium-voltage equipment for construction and site development.

Construction projects meet the grid at the service point — the line side is utility-owned and built to the National Electrical Safety Code, and the load side is premises wiring under the National Electrical Code. Large commercial, institutional, and industrial builds increasingly take service at medium voltage and own the distribution past that point: campus loops at distribution voltages such as 13.8 kV, stepped down to 480 V at each building. Temporary construction power is governed by NEC Article 590 — permitted for the period of construction and removed at completion, with medium-voltage temporary installations fenced or barriered to qualified personnel — and jobsite electrical installations fall under OSHA 29 CFR 1926 Subpart K.

The medium-voltage scope Hawk MV Supply sources for construction follows the underground site-development pattern utility developer guides describe: pad-mounted switchgear and three-phase pad-mount transformers, 200 A loadbreak and 600 A deadbreak elbow connectors at dead-front equipment, cable terminations and splices on the primary runs, junction and sectionalizing cabinets, grounding, and pole-line hardware where the service extension runs overhead. Lead times are the schedule risk: Wood Mackenzie projected 2025 supply deficits of 30% for power transformers and 10% for distribution transformers, and three-phase pad-mount availability is projected to stay tight through 2026 and 2027 — identify the long-lead equipment at design and order early.