78 Commercial Energy Plans Examiner Exam Prep

78 Commercial Energy Plans Examiner Study Guide

Exam Overview

Commercial Energy Plans Examiner (78)

• Questions: 70 multiple-choice
• Time Limit: 3.5 hours (210 minutes)
• Format: Open book
• Cost: $320
• Code Books: 2021 IECC (International Energy Conservation Code) — Commercial Provisions
• Passing Score: 70% (49 of 70 questions)

Exam Content Breakdown

1. General/Administration – 14% (7 questions)
2. Building Envelope (Plans) – 24% (12 questions)
3. Mechanical Systems (Plans) – 22% (11 questions)
4. Service Water Heating (Plans) – 10% (5 questions)
5. Electrical/Lighting (Plans) – 18% (9 questions)
6. Compliance Paths and Documentation – 12% (6 questions)

1. General/Administration (14% – 7 questions)

Plan Review Process for Energy Code

• C103.2: Construction documents must demonstrate compliance with IECC
• Energy compliance documentation required on plans before permit issuance
• Three compliance paths: Prescriptive (C402-C405), Total Building Performance (C407), ASHRAE 90.1
• Plans examiner verifies compliance path selected and all requirements met on plans

What Must Appear on Plans

• Climate zone identification
• Compliance path selected
• Insulation R-values and locations
• Fenestration U-factors and SHGC values
• Mechanical equipment efficiency ratings
• Duct insulation R-values
• Lighting power density calculations
• Lighting control specifications
• Air barrier details

Key Definitions (C202)

• U-factor: Rate of heat transfer (BTU/hr·ft²·°F) — lower is better
• R-value: Thermal resistance (hr·ft²·°F/BTU) — higher is better
• SHGC: Solar heat gain coefficient (0-1) — lower means less solar heat
• Air barrier: Material/system providing continuous air leakage resistance
• Continuous insulation (ci): Insulation continuous across framing members
• Fenestration: Windows, doors, skylights — all glazed openings
• Lighting power density (LPD): Watts per square foot of lighting

2. Building Envelope — Plans (24% – 12 questions)

Plan Review for Envelope Compliance

Insulation Requirements on Plans

• Verify insulation R-values shown match IECC Table C402.1.3 for the project's climate zone
• Check construction type (mass wall, metal frame, wood frame) matches table
• Confirm continuous insulation (ci) is detailed at framing members
• Verify roof, wall, floor, and below-grade insulation specifications

Fenestration Review on Plans

• Table C402.4: Maximum U-factor and SHGC by climate zone
• Verify fenestration schedules show U-factor and SHGC for each product
• Check total fenestration area against 30% maximum (40% with daylighting controls)
• Check skylight area against 5% of gross roof area
• Verify fenestration products are NFRC-rated

Air Barrier Documentation

• Plans must show continuous air barrier system
• Details required at all transitions, penetrations, and joints
• Whole-building testing threshold: 0.40 cfm/sf at 75 Pa
• Material air barrier: ≤0.004 cfm/sf at 75 Pa
• Assembly air barrier: ≤0.04 cfm/sf at 75 Pa

Common Envelope Plan Review Issues

• Missing continuous insulation details at structural connections
• Fenestration schedule doesn't list U-factor/SHGC
• Air barrier not detailed at floor/wall transitions
• Insulation R-values don't match climate zone requirements
• Fenestration area exceeds 30% without daylighting controls

3. Mechanical Systems — Plans (22% – 11 questions)

Plan Review for Mechanical Energy Compliance

Equipment Efficiency on Plans

• Verify HVAC equipment schedules show efficiency ratings (SEER, EER, AFUE, COP)
• Check that specified efficiency meets or exceeds IECC/federal minimum
• Review equipment sizing calculations (Manual J/N or equivalent for commercial)

Control Systems on Plans

• Programmable thermostats specified for each HVAC zone
• Setback capability: 55°F heating, 85°F cooling (unoccupied)
• Minimum 5°F deadband between heating and cooling
• Automatic shutoff controls for systems >15 tons

Economizer on Plans

• Required for cooling capacity ≥54,000 BTU/h
• Verify economizer shown on mechanical plans and schedules
• Check high-limit shutoff specification

Duct System on Plans

• Duct insulation: R-6 minimum in unconditioned spaces
• Duct sealing specification
• Duct leakage testing requirement noted (if ducts in unconditioned spaces)

Pipe Insulation on Plans

• Verify pipe insulation per Table C403.7.1
• Check HVAC piping AND service water heating piping
• Pipe diameter and fluid temperature determine insulation thickness

Ventilation on Plans

• DCV required for spaces >500 sf with occupancy >25/1,000 sf
• ERV required for high outdoor air fraction systems
• Verify DCV and ERV shown on plans where required

4. Service Water Heating — Plans (10% – 5 questions)

Plan Review for Water Heating

• Water heater equipment schedule shows efficiency rating (EF/UEF)
• Meets federal minimum efficiency standards
• Hot water pipe insulation specified: R-2 (with controls) or R-3 (without)
• Heat traps shown on non-circulating storage water heater connections
• Circulating system controls specified (timer or demand)
• Recirculation pump and piping layout shown

5. Electrical/Lighting — Plans (18% – 9 questions)

Plan Review for Lighting