COMMON WORK RESULTS FOR ELECTRICAL - Scope, Design Requirements, and Studies

Oct 23, 2026

Uploaded by Miles

COMMON WORK RESULTS FOR ELECTRICAL defines the electrical design responsibilities and required contract deliverables, aligned with project program documents and the construction budget. It specifies submission timing across schematic design, design development, and construction document phases, including requirements for power distribution planning, arc-flash hazard limits by equipment type, and 20% spare capacity for load growth. The text mandates field verification of existing quantities and conditions, coordination with multiple university departments, documentation of impacted below-grade and in-floor utilities, and short-circuit, protective-device coordination, and arc-flash preliminary studies for new or replacement power distribution systems.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages10

Reading Time25 min

AccessFree to download

Scope

Related Sections

Design Requirements

Power distribution and arc-flash limits

Spare capacity and future load growth

Field verification and coordination

Access, layout, and code/safety compliance

Short Circuit, Protective Device Coordination and Arc Flash Hazard Studies

COMMON WORK RESULTS FOR ELECTRICAL Scope Prepare the project's electrical design and associated contract documents in accordance with these Design Guidelines, in accordance with the scope of work defined in the Program Documents, and within the construction budget. Related Sections U-M Design Guideline Sections: Special Instructions to Designers Special Building Areas Division 26-Electrical Technical Sections Electrical Trades Preferred Manufacturers List Design Deliverables U-M Master Specification Sections: Division 01-General Requirements Division 26-Electrical Master Specifications Division 27-Communications Division 28-Electronic Safety and Security U-M Standard Details: 260000 Series-Electrical Standard Details Reference Documents: NFPA 70E – Standard for Electrical Safety Requirements for Employee Workplaces Design Requirements Submit the documents specified in the Design Deliverables list for approval. Submit them atthe end of the Schematic Design, Design Development and Construction Documents phases. Design the power distribution system such that the arc flash hazard Personal Protective Equipment (PPE) required to examine, adjust, service or maintain equipment while energized is Category 4 or less at unit substations and switchboards, and Category 2 or less at panelboardsand similar equipment. Provide flexibility for future changes in the use of the space, and provide spare capacity for future load growth. Provide 20 percent spare capacity for load growth unless 20 percent spare capacity would require a significant power distribution system upgrade. In those special cases, provide as much spare capacity as the existing system can supply. Field verify the existing installation and/or site. Do not rely solely on the existing drawings and/or site surveys. As a minimum, field verify the quantities, sizes, ages, conditions and spare capacities of the following: • Power ducts, manholes, services to the building and unit substations. • Panels, circuit breakers, disconnect switches, motor controls, raceways and wiring. • Interior and exterior lighting, switches and receptacles. • Grounding. • Telecommunications ducts, manholes, rooms and services to the building. • Fire alarm, security, card access control, audio/visual and other special systems. Coordinate with the Design Manager to obtain recent historical information from the following U-M departments: • Key plans and electrical risers from AEC. • Electrical usage, primary system and unit substation information from the Plant Utilities and Plant Engineering (UPE) Department. • Existing condition information from the Facility Condition Assessment Program, the Facility's Manager and the Plant Region maintenance personnel. • Fire alarm and security system information including fire alarm drill results from the Plant Fire Protection Shop and the Department of Public Safety and Security. • Card access control system information from the Plant Key Office. Show all known below grade, below floor and in-floor utilities that will be impacted by the project's work. Use existing spare circuit breakers or existing spaces whenever possible. If necessary, combine existing lightly loaded circuits to free existing circuit breakers for the new loads. Tap buses only with the approval of the Plant UPE Department. Coordinate with the Design Manager before adding a new unit substation. Number electrical panels and devices in accordance with U-M Standard Detail 260500001. Match the existing installation whenever possible and practical. Locate equipment requiring routine maintenance so it is easily accessible. • Installations shall not require the use of a lift or scaffolding, or the removal of other infrastructure, for routine maintenance. • For rooftop equipment with control panels, motor starters, disconnects or motors mounted over 6 feet above roof level and requiring routine maintenance, arrange for the Architect

FAQs

What must be prepared under the electrical scope?

Prepare the project’s electrical design and associated contract documents following the design guidelines, program documents, and within the construction budget.

What arc-flash hazard limits are required for different equipment categories?

Design the power distribution system so required PPE for examining, adjusting, servicing, or maintaining energized equipment is Category 4 or less at unit substations and switchboards, and Category 2 or less at panelboards and similar equipment.

What studies are required for new or replacement power distribution systems?

Perform a preliminary short-circuit study and protective device coordination study to establish electrical equipment ratings, including checks for equipment provided by others and special handling for interactive power sources.

Oct 23, 2026

Uploaded by Miles