Technology Center: 201 Issues Found

Automated audit of 102 drawing index entries found 100 perfect matches and 2 mismatched sheet titles. The electrical site plan was titled differently from the index, and a plumbing sheet description was truncated. While minor in isolation, index errors propagate to permit applications, sheet transmittals, and RFI tracking.

Panel SB2 schedule shows 225A mains with a 200A main circuit breaker, but the calculated phase currents are 280A, 340A, and 231A. The panel is overloaded as scheduled—phase B exceeds the MCB rating by 70%.

Code: 2018 IBC Section K102.4

The site utility plan specifies 6-inch SCH 40 PVC for a storm drain connection, but the storm drain profile on a different sheet shows 4-inch for the same run. A canopy roof drain ties into this line, making correct sizing essential for stormwater capacity.

Architectural floor plan shows a grid bay dimension that does not match the corresponding structural foundation plan. The discrepancy affects column locations, footing placement, and wall alignment across the building.

The plumbing drawing water heater schedule specifies 240V single-phase at 5 kW, while the project specification calls for 208V three-phase at 4.5 kW. These are fundamentally different electrical requirements affecting panel circuits, wire sizing, and breaker selection.

Code: NEC Article 422

The rooftop unit schedule indicates heat pump with electric supplemental heat, but the mechanical specification section explicitly requires gas-fired heating sections with a minimum 80% thermal efficiency. These are incompatible heating types requiring different fuel connections, controls, and structural support.

The electrical drawings include a note about duct smoke detectors that is ambiguous and does not align with the specification requirement that duct detectors are required on systems serving more than 2,000 CFM. The note could be interpreted to require detectors on all systems regardless of airflow.

Code: IMC Section 606, NFPA 90A

The slab-on-grade patch detail shows the concrete assembly without a vapor retarder. IBC 2018 Section 1907.1 requires a minimum 6-mil polyethylene vapor retarder beneath concrete slabs on grade to prevent moisture migration.

Code: 2018 IBC Section 1907.1

Multiple existing circuits in the panel schedule are shown with 0 load and described as 'unknown load.' NEC 408.4 requires each circuit to have a legible, accurate directory identifying its purpose. Unidentified circuits cannot be properly evaluated for capacity or safety.

Code: NEC Article 408.4

Panel MP1 schedule shows a calculated total of 203A against a 200A main circuit breaker. While the overload is small (1.5%), it technically exceeds the breaker rating and will be flagged during plan review.

Code: NEC Article 220

The occupant load schedule references Section '7.3.1.2' for occupant load calculations instead of 2018 IBC Section 1004. The referenced section does not correspond to the adopted building code.

Code: 2018 IBC Section 1004

The occupant load schedule breaks out an 'ASSEMBLY USE' occupant load for a conference room, despite the space being classified as Business (B) occupancy. IBC Section 303.1 exempts accessory assembly spaces under 750 sq ft from separate Assembly classification.

Code: 2018 IBC Section 303.1

The mechanical general notes state 'install all mechanical work per the National Electric Code, NFPA 70.' Mechanical work is governed by the International Mechanical Code (IMC) and International Fuel Gas Code (IFGC) per IBC Chapter 28, not the NEC.

Code: 2018 IBC Chapter 28

The mechanical drawings show volume dampers with a parallel-blade configuration, but the specification requires opposed-blade balancing dampers for all manual volume dampers. Opposed-blade dampers provide linear airflow control; parallel-blade dampers do not.

Similar to the slab patch detail, the slab-on-grade entry threshold detail does not show a vapor retarder. This is the second structural detail missing this IBC-required component.

Code: 2018 IBC Section 1907.1

Seven IT/communications issues identified where conduit routing shown on the low-voltage drawings conflicts with structural beam and column locations shown on the structural plans. Cable tray and conduit runs pass through structural members without sleeves or penetration details.

Fire alarm device locations shown on the fire alarm plan do not align with the reflected ceiling plan grid. Smoke detectors and notification appliances are shown in locations that conflict with ceiling features, light fixtures, and diffusers.

Code: NFPA 72

Electrical

Panel load calculations, circuit identification, voltage conflicts between drawings and specs, and NEC compliance issues across 61 electrical findings.

Structural

Missing vapor retarders, dimension conflicts between architectural and structural grids, and code reference errors across 42 structural findings.

Architectural

Occupant load calculation errors, code reference mismatches, and classification conflicts across 36 architectural findings.

Civil

Storm drain pipe size conflicts, sanitary sewer detail inconsistencies, and subgrade reference errors across 22 civil findings.

Mechanical

HVAC equipment spec-vs-drawing conflicts, damper type mismatches, and incorrect code references across 21 mechanical findings.

Plumbing

Water heater spec conflicts, pipe sizing discrepancies, and storm drain coordination issues across 6 plumbing findings.

Fire Protection

Duct detector criteria ambiguity and fire alarm coordination issues across 5 fire protection findings.

Document Coordination

Drawing index mismatches, sheet reference errors, and cross-discipline coordination issues—43% of all issues spanned multiple disciplines.