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Internal-arc classification belongs to a tested assembly under stated conditions. The room and duct interface must preserve those conditions and keep the discharge path away from people and critical equipment.
Assembly evidence
- Record classification, accessibility type, tested current and duration.
- Identify tested panel width, end-panel condition, roof arrangement and cable entry.
- Obtain manufacturer instructions for plenum, duct, wall penetration and outlet.
Room coordination
- Confirm front, rear, side and ceiling clearances against tested configuration.
- Check doors, escape routes, ventilation openings, cable trenches and adjacent equipment.
- Evaluate the pressure path and possible re-entry of hot gases.
- Keep exhaust outlets inaccessible and away from air intakes, façades and occupied zones.
Duct and support review
- Verify section, bends, length, joints, supports and building penetration.
- Confirm mechanical loads and reaction forces with the supplier and structural engineer.
- Check corrosion protection, water ingress, drainage and inspection access.
- Do not add screens, dampers or reducers unless explicitly validated.
Installation close-out
Photograph every joint and outlet, record deviations, verify fasteners and seals, and obtain manufacturer acceptance for nonstandard interfaces. A generic room pressure calculation does not by itself extend an internal-arc test certificate.