Electrical Calculators
Check raceway space before pulling wire: conduit fill percentage from conductor insulation area, conductor count and conduit trade size, with one-, two-, three-plus conductor and short-nipple fill limits.
Voltage Drop
Voltage drop, percent drop, load-end voltage and suggested conductor area from phase, wire size, current and one-way length.
Transformer kVA
Single-phase or three-phase transformer kVA from volts and amps or kW and power factor, with standard-size rounding.
Conduit Fill
Raceway fill from conductor count, insulation area and conduit trade size, with NEC-style 53/31/40/60% limits.
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This Electrical cluster now covers the early feeder and raceway checks that usually happen before a panel or equipment layout is final. The voltage drop calculator screens copper or aluminum conductors with the circular-mil shortcut VD = M×K×I×L/CM, where M is 2 for single-phase/DC or √3 for balanced three-phase. It reports volts lost, percent drop, load-end voltage, maximum one-way length and the first listed conductor area that meets your target drop.
For source capacity, the transformer kVA calculator uses kVA = V×I/1000 for single phase, kVA = √3×V_LL×I/1000 for three phase, or kVA = kW/PF when real power is known. It applies a sizing margin, rounds up to a common standard kVA rating, and reports full-load current, utilization and spare capacity.
The conduit fill calculator then screens the raceway by summing conductor insulation areas and comparing the total with usable conduit area. It applies the common NEC-style Chapter 9 fill percentages: 53% for one conductor, 31% for two, 40% for three or more, and 60% for short nipples when that condition applies. These tools are design and estimating screens only; final work still needs the adopted code edition, local amendments, conductor ampacity adjustment, box fill, bend radius, pulling tension, overcurrent protection, grounding and the exact manufacturer dimensions.