Engineering Services

Engineering Services

Electrical Engineering

e3i Engineers Electrical engineering services understands that a safe, reliable, flexible, and resilient electrical system is the lifeblood of the modern business.

Without electricity, your business will grind to a halt! Our team of experienced, professional engineers listens to your business needs and budget goals to design the most effective system to support your particular strategy.


  • Medium voltage substations and distribution
  • Standby generator systems and paralleling switchgear
  • UPS system design and integration into redundant multi-module architecture
  • Fire alarm system design
  • Short circuit calculations and arc flash analysis
  • Load flow analysis, system stability review and harmonic analysis/mitigation designs
  • Utility coordination and Interconnect Agreement management
  • Owner’s technology project representative (OPM) and peer review
  • Master planning
  • Construction documents and administration

Mechanical Engineering

e3i Engineers provides mechanical engineering services with the primary focus of accomplishing our client’s goals.

We evaluate systems based on reliability, efficiency, lifecycle and first cost, maintenance, and constructability. e3i understands the criticality of mechanical systems whether it is keeping servers operational, tenants comfortable, laboratories safe, or energy and maintenance costs to a minimum.  Communication with key stakeholders is our focus for a successful project.


  • Hydronic plant and distribution design
  • Airside infrastructure and distribution
  • Laboratory and manufacturing ventilation
  • Automatic temperature controls and optimization
  • Energy analysis and CFD model simulations
  • Owner’s technology project representative (OPM) and peer review
  • Master planning
  • Construction documents and administration

e3i Engineers looks forward to working diligently to accomplish your mechanical goals.

Design Build Engineering

e3i Engineers’ dedication to design build is an important delivery method that sets us apart from our competitors.

Design build is a popular project delivery method across North America and that has gained traction in New England and the Northeast. Several contractors are employing this model, but few electrical engineering firms have this as one of their primary focuses. While many contractors seek the lowest-cost solutions, design build partnerships foster a higher-level of engineering for a more valuable outcome. Additionally, our positive working relationships with contractors is an asset to our clients. Because we understand the contractor workflow and our place within it, we are able to integrate into their process to make the biggest positive impact and mitigate construction setbacks.

Likewise, we specialize in design assist when design build is not an option. We communicate well across all team members and support the owner’s and contractor’s best interests when decisions are on the table. Our collaborative and proactive mentality fills the gaps to deliver our projects to the client’s satisfaction.


  • Electrical design
  • Arc flash calculations and labeling
  • Short circuit, coordination, and arc flash studies
  • Single point of failure consulting
  • Value engineering
  • Third-party engineering reviews
  • Professional opinion papers

Design Assist Engineering

e3i Engineers provides Design Assist Engineering services, a service method by which a contractor selects an engineering design firm to be their advocate and provide assistance on a particular project.

The Design Assist Engineer (DAE) is retained by the contractor and separate from the engineer of record (EOR). The DAE is an integral and active member of the team and is the installing contractor’s link to the design process. The role of the DAE is to be the representative of the installation contractor throughout the design and construction phases of the project. The DAE’s involvement can be for a single design or construction phase of a project but it is recommended that their involvement begin at the conceptual phase.


  • Design suggestions and value engineering ideas
  • System design, redesign and coordination
  • Calculations
  • Equipment selection
  • Room layouts
  • Specialty systems
  • Coordinate risers and one-lines
  • Attend meetings and site visits
  • Status of construction
  • Purpose design solutions to problems or challenges identified in field
  • Opinion letters and reports
  • Infrastructure review and assessments
  • Power system studies (including short circuit and coordination)