NYCEC 2025 NEC 2020
Trending
—

Empire Code AI

NEC & NYCEC 2025 field assistant

310.16 Base ampacity · Temp correction · CCC adjustment
110.14(C) Terminal Limit — use 75°C column for final ampacity
Wire Size
Insulation
Material
Ambient Temp
CCC (Bundling)
On or Above Roof
AMPACITY — NEC 310.15
NEC TABLE 310.16
Copper
Aluminum
Wire 60°C75°C90°C Typical UseMax Breaker
TEMP CORRECTION — NEC 310.15(B)(1)
Ambient60°C75°C90°C
NEC Ch.9 53% (1 wire) · 31% (2 wires) · 40% (3+ wires)
NYCEC 334.12 EMT required · No Romex in commercial/multifamily
Conduit Type
Conduit Size
Wire Type
Wire Size
# Wires
CALCULATION RESULT
MAX CONDUCTORS (40% FILL)
EMT
IMC
RMC
ENT
PVC40
PVC80
NEC 210.19 3% branch / 3% feeder recommended (informational, not enforced under base NEC)
NYCEC 215.2 5% total (feeder + branch combined) — MANDATORY in NYC, same for all occupancies
Load (Amps)
One-Way Distance (ft)
System Voltage
Phase
Conductor
Max VD %
VOLTAGE DROP CALCULATION
WIRE SIZE COMPARISON
Wire SizeCM AreaVDDrop %V at LoadStatus
NEC 314.16 Volume per conductor by AWG · Devices = 2× largest
Box Type
Wire Size (largest)
# Conductors
# Devices
Internal Clamps
EGC
Extension Ring
BOX FILL — NEC 314.16
CONDUCTOR VOLUME — NEC 314.16(B)
WireVol/CondDevice (×2)Clamp/EGC (×1)
BOX VOLUME — NEC 314.16(A)
Box TypeVol (in³)#14 max#12 max#10 max
310.15 + 210.19 Ampacity after derating AND V-Drop — both conditions
BOTH Wire must pass derating AND voltage drop simultaneously
NYCEC 215.2 5% total (feeder + branch combined) — MANDATORY in NYC, same for all occupancies
Load (Amps)
Continuous Portion (A)
NEC Art. 100: a load whose maximum current is expected to continue for 3 hours or more. Sized at 125% per 210.19(A)(1) / 215.2(A)(1).
Circuit Type
100%-Rated Assembly
Only Yes if the complete assembly, including the overcurrent device, is listed for continuous operation at 100% of its rating. Rare below 400 A.
One-Way Distance (ft)
System Voltage
Phase
Material
Insulation
CCC Bundling
Ambient Temp
Max VD %
Enter load to calculate