Electric Vehicle Charging Station Design

MDTA requested that JMT provide electrical vehicle charging options at their Baltimore Harbor Tunnel (BHT) Administration and Fort McHenry Tunnel (FMT) Administration Buildings. Both Administration Buildings required ADA compliance.

The design included three (3) fully functioning electrical vehicle charging stations that allow for payment by the public and use by MDTA employees at the BHT Administration Building, and two fully functioning electrical vehicle charging stations at the FMT Administration Building.

Station designs had network capabilities that included software and service contracts from Chargepoint as MDTA desired.

Work resulted in ADA compliant access for charging stations and Administration Buildings.

The electrical design for each facility included:

  • 277/480V Milbank 400A rated power pedestal and pad as recommended by manufacturer
  • 400A MCB to be fed from new 400A utility service transformer
  • design for conduit, pad, and grounding for new service as per BG&E requirements
  • three chargepoint express 250 stations with pads at BHT and two (2) in the parking lot median at FMT
  • underground conduit and feeders to power charging stations
  • spare underground conduit ending adjacent to charging stations to allow for future expansion
  • square D Mini-Pwr Zone on kindorf rack and necessary feeders and conduit from Milbank Pedestal
  • two (2) 20A GFCI free-standing service receptacles in a weatherproof enclosure and necessary conduit and wiring to be fed from MiniPwr Zone, and
  • spare conduit from Mini-Pwr Zone to end adjacent to free-standing receptacles

The Civil design for the facilities included:

  • construction phasing such that the site remained accessible and operational at all times
  • removal of existing features as required for the installation of the new work
  • review of test pits as required for existing utilities
  • new concrete pad for ADA access for the installation of the EVCS unit
  • new curb, sidewalk and sidewalk ramp
  • steel bollards for EVCS protection
  • pavement markings, striping, and signage, and
  • restoration of utility trenches in grass areas per the proposed detail