// SCORE BREAKDOWN
Comprehensive 477-diagram engineering reference with professional quality and offline access serving technical professionals clearly.
// ABOUT
Engineering Systems Atlas is the definitive visual reference for working engineers, technicians, students, and inspectors. Browse 477 professional-quality diagrams spanning 8 major engineering disciplines — all offline, all in one app. WHAT IS INSIDE 477 illustrations organized into 8 engineering categories: • Electrical Systems — power distribution, panel wiring, conduit layouts, load centers • Fire Alarm Systems — initiating devices, notification appliances, control panels, wiring • HVAC Systems — air handling, duct networks, chilled water, refrigerant circuits • BIM and Construction — floor plans, riser diagrams, coordination views, LOD references • Enterprise IT — network topology, structured cabling, data center layout, TIA-942 • PLC and Automation — ladder logic, I/O modules, PLC panels, field instrumentation • SCADA and Controls — RTU diagrams, HMI screens, Modbus/DNP3 architecture, control loops • RF and Radio Systems — antenna configurations, path diagrams, repeater systems, link diagrams ENGINEERING CALCULATORS Each category includes a dedicated field calculator: • Voltage Drop — NEC K-factor conductor sizing with pass/fail at 3% threshold • Battery Standby — NFPA 72 battery Ah sizing for fire alarm panels • HVAC — CFM airflow, cooling load in BTU/h and tons, duct sizing at target FPM • BIM Space — multi-room gross/net area, GFA, and volume in imperial or metric • IT Network — PoE budget (802.3af/at/bt) and IPv4 subnet calculator with CIDR • PLC I/O — module count, chassis sizing, and scan time estimation • RF Link Budget — FSPL, path loss, link margin with fading environment presets • SCADA Timing — Modbus RTU frame timing, T3.5 gap, and DNP3 poll cycle load STANDARDS REFERENCE Built-in searchable reference covering NFPA 72, NEC, ASHRAE, ISO 19650, IEC 61131-3, IEC 62443, TIA-942, and ITU/FCC standards — filtered by engineering domain. KEY FEATURES • Swipeable full-screen gallery — page through every diagram in a category • Pinch-to-zoom — inspect fine detail on any illustration • Favorites — star and collect your most-used diagrams • Works fully offline — no internet connection required • iPhone and iPad — optimized for all screen sizes and orientations Whether you are reviewing a design, studying for a certification, or troubleshooting a system in the field, Engineering Systems Illustrated puts 477 reference diagrams and professional engineering tools in your pocket.