Electrical Engineering Standards

Review Design Standards General Statements before utilizing this web page.

On this page:
Building Codes & Industry Standards
Denver Service Center (DSC) Requirements
National Park Service (NPS) Requirements
Laws


Building Codes & Industry Standards

  • ASHRAE 90.1 2016 (American Society of Heating, Refrigerating and Air Conditioning Engineers)
  • EIA/TIA Standards 568 & 569 (Electronic Industries Alliance/Telecommunications Industry Association)
  • IEEE Standards
  • IES Lighting Handbook 10th Edition (Illuminating Engineering Society)
  • NESC 2017 (National Electrical Safety Code)
  • NFPA (National Fire Protection Association) Codes and Standards - see Fire Protection Engineering Standards
  • NFPA 70 NEC (National Electrical Code) 2017
  • UL (Formerly Underwriters Laboratories)

Denver Service Center (DSC) Requirements

Conduit

  • Site specific. In general, Schedule 40 PVC (polyvinyl chloride) for underground.
  • PVC coated rigid metal elbows for risers to grade.
  • Minimum branch circuit conduit size: 3/4 inch.
  • Provide conduit for wiring (minimum size 3/4 inch).
  • Non-metallic conduit or tubing is not allowed in interior dry locations unless required by code.
  • Route a separate equipment grounding conductor, sized per NEC requirements, in conduits.
  • Heavy duty disconnect switches.

Equipment and Materials

  • Listed and labeled as defined in NEC Article 100 for application.

Load Requirements

  • NEC 2017
  • 25% minimum spare capacity typical for future expansion.

Overcurrent Protection

  • Fully rated - Series rated is not desired.
  • Breakers preferred for reset capability (sizes 15 amperes or greater).
  • Fuse selection shall comply with NEC requirements and equipment manufacturers recommendations.

Power Wiring

  • THWN/THHN (Thermoplastic Heat and Water Resistant Nylon Coated/Thermoplastic High Heat Resistant Nylon Coated)
  • Underground - THWN/XHHW (Cross-Linked High Heat Water-resistant Insulated Wire)
  • No MC or AC (Metal Clad or Armor Clad) type cabling in walls in new construction.
  • No surface mounted MC or AC type cabling where rigid raceway can be used.
  • Copper conductors
  • Copper Buswork

Telecommunication

  • EIA/TIA Standards, see above.
  • Category 6 Cabling - (2) per 3/4 inch conduit; (1) Data, (1) Voice per each voice/data outlet (typical). Terminate conductors.
  • Telephone Service Entrance (Demarcation Point) - Meet local phone company requirements.
  • Architect-Engineer (AE) shall query Park for additional IT (information technology), telecom, or data system requirements.

Utilities

  • Coordinate with utility companies as early as possible.
  • Underground distribution as much as possible.
  • NPS prefers not to own and operate utilities.
  • TVSS (Transient Voltage Surge Supressor) Protection on service entrances.
  • Owner demand metering complying with EPACT 2005 (Energy Policy Act) for Federal buildings in addition to utility company metering.

National Park Service (NPS) Requirements

NPS Management Policies 2006 - The Guide to Managing the National Park System

Director's Orders (DOs)

Handbooks, Reference Manuals (RMs), Strategies, Plans, & other Professional Materials


Laws

 

Last updated: October 17, 2018