EP Services

Our value to our clients is rooted...

D2E Engineering Services

Design & Pre-Construction

  • Electrical design and coordination with Architect and all other disciplines. Electrical design to include:

    - Electrical Power Distribution Design System
    - Interior Lighting Design System
    - Lighting Controls and Dimming Design System
    - Data and Telecommunication Design System
    - Emergency Generator Design Power Distribution System
    - UPS Design System
    - Fire Alarm Design System
    - VESDA system
    - Cable management
    - NOC room design
    - SCIF room design
    - Photometric studies and site lighting design
    - Site lighting control systems
    - Grounding and Lightning Protection Systems
    - Utility load calculation
    - Utility sub metering for special equipment or tenant
    - Short circuit calculation
    - voltage drop calculation
    - TVSS - Transient Voltage Surge suppresser design
    - Electrical code analysis
    - EPO design
    - Critical power distribution

  • Design Document Review (if designed by others)
  • Utility Coordination
  • Short circuit, protective coordination and arc flash hazard study
  • We provide Short circuit calculation, breaker and fuse curve analysis, coordination study, PPE chart and arc flash hazard study. We provide the energy level labels that are required to be installed at the switchboards and panel.

    Construction Services

    • Bid Analysis & Comparison
    • Submittal Review
    • Value Engineering
    • RFI services
    • Construction Progress Assessment
    • Construction Quality Assurance
    • Change Order Review
    • Review of O&M Manuals and As-Built Drawings
    • Review and Verification of Test and Balancing Reports

    UPS Services

    We have designed a variety of small and large size UPS for commercial and mission critical facilities. We have provided parallel redundant, N+1, 2N, series and expandable UPS design.

    We have provided dry cell and wet cell battery design for selected UPS. Provided wet cell battery rooms that requires explosion proof environment.

Residential EP Services

D2E Engineering has provided electrical design and construction services for variety of low-rise and high-rise multi-family residential units. Design for a multi-family residential building requires a number of items to be considered. There is a variety of people with various ages, health conditions, mobility and capabilities that live in multi-family residential buildings. We have successfully designed the electrical system for vast number of existing multi-family residential buildings with various services shown below.

The following is a list of the services that we have provided:

  1. Electrical Car Charging Stations
  2. Washer-dryer study.
  3. Laundry room expansion.
  4. Washer-dryer addition to apartment units that have no spare electric capacity.
  5. Changing of individual apartment HVAC unit with a different type, such as PTAC or window unit.
  6. Electric utility load calculations.
  7. Apartment riser load calculations.
  8. Replacement of Federal Pacific electrical panels.
  9. Replacement of old main distribution panels.
  10. Replacement of old main switchboards.
  11. Upgrading electrical rooms up to current codes.
  12. Providing a proper grounding for all electrical systems in all buildings.
  13. Design lightning system.
  14. Design additional outdoor site lighting.
  15. Design minimum lighting foot candle recommendations in walkways to avoid any dark spots.
  16. Fire pump addition upgrade/recommendations.
  17. Connection of fire pump to emergency generator.
  18. Modernization of elevator electrical system.
  19. Connection of elevator (s) to emergency generator.
  20. Limiting power outages to the elevators during construction.
  21. Providing generator or emergency power to the elevator and all its components.
  22. Upgrading emergency lighting in high-rise or low-rise, multi-family residential units.
  23. Design for fire alarm system.
  24. Reviewing fire alarm system proposals by a contractor.
  25. Provide recommendations for infrared scan of electrical system.
  26. Electric utility service evaluation and upgrade.
  27. Total building electrical system evaluation.
  28. Evaluation of existing fire pump and upgrade of the electrical connection to the fire pump.
  29. Connection of fire pump to the emergency generator

Generator Services

We have provided designs for emergency stand by generators for multi-family residential, medical, commercial and mission critical facilities. Provided load shedding design. Provided design for generator parallel gear for critical facilities including 911 center and major data center.

The following is a list of the services that we have provided:

  1. Addition of generator to support emergency lighting, fire alarm system, elevators, and life safety loads.
  2. Upgrade of existing generator.
  3. Evaluation of existing generator and existing load. Determine existing generator spare capacity to add new loads.
  4. Generator load shedding. Divide the loads to critical or life safety loads and essential loads. Provide design to prioritize the generator supply to critical load and to secondary/essential loads. During the generator overload condition, the generator will drop the load to essential equipments, and will only supply to the critical/life safety equipment. We will provide code compliant design.
  5. Startup and commissioning services.
  6. Generator power to a special equipment or area, such as sewer pumps, water pumps, management office, garage doors, front-entrance security lighting, main entry doors to the building, etc.
  7. D2E Engineering has provided engineering design for a normal and a luxury low-rise and high-rise buildings. We have extensive and diverse experience capabilities, which allow to provided proper design consultations to our client. We are specialized to sit down with the client and provide dedicated solutions to owners' special requirements and problems.
  8. We have provided and evaluated a number of emergency power systems that serve the buildings to create an upgraded system that complies and conforms to the latest electrical code requirements.

Electrical, Plumbing Engineering Design Services

Electrical Engineering

Electrical Engineering

Mission Critical - consulting services to
complete design and construction services;
to build a facility from the ground up.

Plumbing Engineering

Solutions that are practical, effective, and
proven as well as ideas that are well-honed
to the business challenges our clients face

Other Services

Engineering Construction


  • Analysis of Project E/P Requirements
  • Comparative Reliability Analysis
  • Energy Calculations

Design & Pre-Construction

  • Plumbing systems design and coordination with Architect & Civil Engineer.
  • Electrical design and coordination with Architect and all other disciplines.


  • Development Electrical Commissioning Procedures and Specifications tailored for the specific project
  • Building Systems Integration Testing
  • Factory Witness & Acceptance Testing

D2E ENGINEERING is gaining in stature as a respected

engineering design company.

Meet Our Team

About us

D2E ENGINEERING is an experienced engineering design company providing superior engineering design, construction services, and commissioning for new construction, renovations, mission critical and tenant fit outs.

D2E ENGINEERING offers a vast knowledge of design and expertise in commercial facilities. We focus on providing for our client the quality performance achieved in a cost effective and timely manner. The principals and key personnel of D2 ENGINEERING are experienced in electrical, and plumbing systems. The principals have over 25 years of experience.

  • Electrical Engineering
  • Plumbing Engineering

Serving the Washington, D.C., Maryland and Virginia metropolitan area.

Our Clients

The company provides electrical and plumbing design services to a wide variety of commercial clients, primarily in the Washington DC area.

Get Directions

Find us

  • 18310 Montgomery Village Ave, Suite 520
    Gaithersburg, MD 20879
  • 301.208.9576    Fax: 301.208.9576
  • D2Eengineering@comcast.net