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Conduit Fill Calculator NEC Ch.9

Conduit Type

Trade Size (Inches)

Add Conductors

NEC Conduit Fill Rules Chapter 9 Table 1

# of Conductors	Max Fill %	Rule
1	53%	One conductor in raceway
2	31%	Two conductors in raceway
3 or more	40%	Three or more conductors

Quick Reference — Max THHN Conductors in EMT NEC Table C.1

EMT Size	Total Area	40% Fill	Max 12	Max 10	Max 8	Max 6	Max 4
1/2"	0.304	0.122	9	5	3	2	1
3/4"	0.533	0.213	16	10	5	4	2
1"	0.864	0.346	26	16	9	6	4
1-1/4"	1.496	0.598	44	28	16	11	7
1-1/2"	2.071	0.829	62	39	22	16	10
2"	3.408	1.363	102	64	37	26	16
2-1/2"	5.200	2.080	156	98	56	40	25
3"	7.700	3.080	231	145	84	60	37

Per NEC Chapter 9 Table C.1 — THHN/THWN-2 at 40% fill (3+ conductors). Verify against your code book for exact counts.

NEC 2020 Code Reference NC Edition

Amperage Lookup

Enter Amperage to Highlight

NEC 110.14(C) Note:
For equipment rated 100A or less, or marked for 14–1 AWG conductors, use the 60°C column even if wire insulation is rated higher.

For equipment rated over 100A, or marked for conductors larger than 1 AWG, use the 75°C column.

Insulation Types:
60°C: NM-B, UF-B
75°C: THW, THWN, XHHW, SE, USE
90°C: THWN-2, THHN, XHHW-2

Wire Size and Amp Ratings NEC Table 310.16

Allowable ampacities of insulated conductors rated up to and including 2000 Volts. Not more than 3 current-carrying conductors in raceway, cable, or earth. Based on ambient temperature of 30°C (86°F).

Wire Gauge Size	Copper			Aluminum
Wire Gauge Size	60°C (140°F)	75°C (167°F)	90°C (194°F)	75°C (167°F)	90°C (194°F)

WARNING: Installation of electrical wire can be hazardous if done improperly and can result in personal injury or property damage. For safe wiring practices, consult the National Electrical Code® and your local building inspector.

Next Size Up Rule NEC 240.4(B)

Where the ampacity of a conductor does not correspond to a standard overcurrent device rating, the next higher standard rating shall be permitted, provided all of the following conditions are met:

Conditions for using next size up (240.4(B)):

1. The conductors are not part of a multioutlet branch circuit supplying receptacles for cord-and-plug-connected portable loads

2. The conductor ampacity does not correspond to a standard OCPD rating

3. The next higher standard rating selected does not exceed 800A

Standard OCPD Ratings — NEC 240.6(A):

15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000, 5000, 6000

Example:

A 3 AWG THHN copper conductor is rated 115A at 90°C. Since 115A is not a standard breaker size, you can use a 125A breaker per 240.4(B).

However, you must still use the 75°C column (100A) for termination temperature per 110.14(C) — so the breaker must be sized based on that column unless the equipment is specifically rated for 90°C terminations.

Small Conductor Protection NEC 240.4(D)

Overcurrent protection shall not exceed the following for small conductors (unless specific exceptions apply):

Wire Size	Max OCPD	Insulation
14 AWG Cu	15A	Any listed 14 AWG
12 AWG Cu	20A	Any listed 12 AWG
10 AWG Cu	30A	Any listed 10 AWG

NEC 240.4(D) exceptions include: specific tap conductor rules (240.21), transformer secondary conductors (240.21(C)), and motor circuit conductors (430.52).

Conductor Derating NEC 310.15(C)(1)

When more than 3 current-carrying conductors are in a raceway or cable, the allowable ampacity must be derated (reduced) per NEC Table 310.15(C)(1):

Current-Carrying Conductors	% of Table 310.16 Value
1–3	100% (no derating)
4–6	80%
7–9	70%
10–20	50%
21–30	45%
31–40	40%
41+	35%

Derating Calculator

Wire Size

Temp / Material

# Current-Carrying Conductors

Ambient Temp (°C)

Ambient Temperature Correction — NEC Table 310.15(B)(1)

When the ambient temperature exceeds 30°C (86°F), multiply the Table 310.16 ampacity by the correction factor:

Ambient Temp (°C)	60°C Wire	75°C Wire	90°C Wire
21–25	1.08	1.05	1.04
26–30	1.00	1.00	1.00
31–35	0.91	0.94	0.96
36–40	0.82	0.88	0.91
41–45	0.71	0.82	0.87
46–50	0.58	0.75	0.82
51–55	0.41	0.67	0.76
56–60	—	0.58	0.71
61–65	—	0.47	0.65
66–70	—	0.33	0.58

Key Derating Rules:

Neutrals: Neutral conductors carrying only unbalanced current are NOT counted as current-carrying (310.15(E)(1)). Exception: in a 3-wire circuit from a 4-wire wye system, the neutral IS counted.

Equipment grounding: EGC and bonding conductors are NEVER counted as current-carrying.

Harmonics: On a 4-wire 3-phase wye system with nonlinear loads (LED drivers, VFDs), the neutral carries harmonic currents and MUST be counted as current-carrying (310.15(E)(3)).

Nipples: Raceways not exceeding 24" (600mm) are exempt from conductor fill derating per 310.15(C)(2).

Circuit Parameters

System Voltage

Wire Size

Wire Material

One-Way Length (feet)

Load Current (amps)

Power Factor

Result NEC 210/215

NEC Voltage Drop Recommendations:
Art. 210.19 Info Note 4: Branch circuits should not exceed 3% voltage drop.
Art. 215.2 Info Note 2: Total (feeder + branch) should not exceed 5%.
These are recommendations, not hard requirements — but most AHJs expect compliance.

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Conduit Fill Calculator NEC Ch.9

Add Conductors

NEC Conduit Fill Rules Chapter 9 Table 1

Quick Reference — Max THHN Conductors in EMT NEC Table C.1

NEC 2020 Code Reference NC Edition

Amperage Lookup

Wire Size and Amp Ratings NEC Table 310.16

Next Size Up Rule NEC 240.4(B)

Small Conductor Protection NEC 240.4(D)

Conductor Derating NEC 310.15(C)(1)

Circuit Parameters

Result NEC 210/215

Calculators

Plan Set 0

Building Analysis 🔍

Active Sheet

Sheet Overlays 👁

Placement Tools

Exclusion Zone Type

Circuits

Exclusion Zones 0

Auto-Route

NEC 2020 Compliance

Legend

Conduit Fill Calculator NEC Ch.9

Add Conductors

NEC Conduit Fill Rules Chapter 9 Table 1

Quick Reference — Max THHN Conductors in EMT NEC Table C.1

NEC 2020 Code Reference NC Edition

Amperage Lookup

Wire Size and Amp Ratings NEC Table 310.16

Next Size Up Rule NEC 240.4(B)

Small Conductor Protection NEC 240.4(D)

Conductor Derating NEC 310.15(C)(1)

Circuit Parameters

Result NEC 210/215

Calculators

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