BAS-202 Visual Aid Library
Figure-use rule
Each figure is an orientation and reasoning aid, not a project drawing. Learners must pair it with the current sequence, point list, wiring/piping documents, manufacturer instructions, and as-found evidence.
Normal-rule anchor
The shortest or familiar route is not automatically approved; source hierarchy and coordination control.
Case overlay
The reflected ceiling plan, electrical drawing, and controls detail show different routes around a rated corridor.
Calculation/evidence callout: Reconcile route dimensions, elevations, sources, interfaces, and unresolved conflicts.
Normal-rule anchor
Material names are not universal permissions; the approved complete system and exact use conditions govern.
Case overlay
A damp mechanical room and outdoor transition are shown with the same material and fittings as a dry office ceiling.
Calculation/evidence callout: Compare all required environmental, mechanical, dimensional, and listing fields; calculate material quantities and transitions.
Normal-rule anchor
Measure from controlled datums and actual endpoints; accumulated assumptions become visible misalignment and rework.
Case overlay
A panel hub and sensor box are at different elevations with duct, sprinkler, and access-door conflicts.
Calculation/evidence callout: Use drawing scale and dimensions to calculate lengths, elevations, support count from supplied criteria, and material allowance.
Normal-rule anchor
Use the exact bender markings and verified reference table; memorized take-up from another tool is not evidence.
Case overlay
A 10-inch stub must land at a box, but the learner uses a take-up value from a different conduit size.
Calculation/evidence callout: Calculate mark=desired stub-take-up, verify developed length/gain using the supplied method, and check orientation.
Normal-rule anchor
An offset is geometry plus tool execution; multiplier and shrink values must come from the selected angle/method and be checked in the field.
Case overlay
A conduit must rise 4 inches over a beam and still land at a box centerline with limited run length.
Calculation/evidence callout: Compute spacing=rise x multiplier, shrink from supplied factor, new cut/landing position, and reasonableness against the route.
Normal-rule anchor
Advanced bends require a diagram, controlled references, plane/orientation marks, and verification; extra bends are not free.
Case overlay
The route shifts 6 inches sideways and 8 inches vertically around a pipe rack before a final box.
Calculation/evidence callout: Compute true rolling offset using the Pythagorean relationship, then multiplier spacing, shrink/allowance, and total bend.
Normal-rule anchor
Fittings and supports are part of the approved pathway; making parts fit or look straight does not prove suitability.
Case overlay
A top entry creates a water path, flex lacks strain/support control, and a straight run is tied to another trade support.
Calculation/evidence callout: Reconcile material quantities and supplied box/entry/support criteria; calculate bend space, supports, defects, corrections, and reinspection coverage.
Normal-rule anchor
Fill and pull limits depend on the actual conductors/cables, raceway, adopted rule, project, and manufacturer information.
Case overlay
A proposed run contains mixed controls cables, four 90-degree bends, no pull point, and no documented cable area.
Calculation/evidence callout: Sum supplied conductor/cable areas, apply the assigned criterion, calculate percent fill and total bend, and test alternatives.
Normal-rule anchor
Penetration and firestop work preserves an assembly, not just a hole; exact listed system, trade scope, and AHJ/project process govern.
Case overlay
A controls raceway crosses a rated wall beside life-safety systems and the detail does not identify the firestop system.
Calculation/evidence callout: Reconcile penetrations by assembly/system/size/owner and calculate completion and inspection status.
Normal-rule anchor
Pathway release requires all temporary marks/materials, open ends, defects, changes, and records reconciled.
Case overlay
Cable pull is scheduled, but one offset dimension, two supports, a penetration system, and the final redline are unresolved.
Calculation/evidence callout: Reconcile planned/installed/inspected/passed/corrected/reinspected/as-built counts and calculate pull-readiness completeness.