8Arc Flash Boundary Calculator
Simplified IEEE 1584-style model for trainee illustration. Computes incident energy at the working distance and the arc-flash boundary (where energy = 1.2 cal/cm² — onset of 2nd-degree burn). Always run a full IEEE 1584-2018 study for engineered protection.
From the upstream protective-device time-current curve at the calculated arcing current.
Typical: 455 mm for low-volt panels, 610 mm for switchboards, 910 mm for MV gear.
Incident energy & boundaries
— cal/cm² @ working distance
—
Arcing current Iₐ—
Arcing time—
Arc-Flash Boundary (1.2 cal/cm²)—
Limited Approach (NFPA 70E)—
Restricted Approach—
PPE category (illustrative)—
Limited / Restricted distances use the NFPA 70E table for the entered voltage.
9LOTO Step Sequencer
Drag the eight Lockout/Tagout steps into the correct sequence. The tool validates each placement against OSHA 1910.147 / NFPA 70E and explains any errors.
Score
— / 8 steps in correct position
—
21Cable Voltage Drop Calculator
Compute voltage drop and percentage drop for a copper or aluminium cable run. Single-phase: V_drop = 2·I·L·R/1000 · Three-phase: V_drop = √3·I·L·R/1000. Compares against the typical 3% (lighting) / 5% (power) limits per IEC 60364 / NEC 215.
0.51.00
Voltage drop
— % of nominal
—
Voltage drop—
Voltage at load—
Conductor R @ T—
Power loss in cable—
Limit applied—
Suggested next size up—
For training purposes only. Never work live — engineering studies signed by a qualified electrical engineer must drive the actual PPE category and labelling.