Electrician's Pocket Card — Ampacity, Motor FLA, Box Fill & Bending

One-page electrician's card: NEC 310.16 copper ampacity, motor full-load currents, box fill allowances, and EMT bend multipliers.

Updated August 20, 2026

The four tables an electrician reaches for between the panel and the bender, on one printable card: NEC Table 310.16 copper ampacities at all three insulation ratings, the standardized motor full-load currents from Tables 430.248 and 430.250 that Article 430.6 makes you use instead of the nameplate, the per-conductor box fill allowances of Table 314.16(B) alongside common marked box volumes, and the offset multipliers and stub take-up numbers stamped on an EMT bender head.

Every cell is generated from the same source-verified constants that drive the conductor ampacity, box fill, and conduit bending calculators and the motor FLA reference chart — nothing on this card is retyped. Use the print button for a one-page letter copy; the linked calculators apply the ambient, bundling, and continuous-load corrections these raw table values do not include.

Electrician's Pocket Card — Ampacity, Motor FLA, Box Fill & Bending — updated August 20, 2026

Copper ampacity (NEC 310.16)

Size	60 °C	75 °C	90 °C
14 AWG	15	20	25
12 AWG	20	25	30
10 AWG	30	35	40
8 AWG	40	50	55
6 AWG	55	65	75
4 AWG	70	85	95
3 AWG	85	100	115
2 AWG	95	115	130
1 AWG	110	130	145
1/0 AWG	125	150	170
2/0 AWG	145	175	195
3/0 AWG	165	200	225
4/0 AWG	195	230	260

Copper, ≤3 current-carrying conductors, 30 °C ambient. kcmil, aluminum, corrections: wire gauge & ampacity chart.

Motor FLA, single-phase (NEC 430.248)

hp	115 V	208 V	230 V
1/4	5.8	3.2	2.9
1/3	7.2	4	3.6
1/2	9.8	5.4	4.9
3/4	13.8	7.6	6.9
1	16	8.8	8
1-1/2	20	11	10
2	24	13.2	12
3	34	18.7	17
5	56	30.8	28
7-1/2	80	44	40
10	100	55	50

Full-load current in amperes. Size conductors at 125% of these values per 430.22; set overloads from the nameplate.

Motor FLA, three-phase (NEC 430.250)

hp	208 V	230 V	460 V
1/2	2.4	2.2	1.1
3/4	3.5	3.2	1.6
1	4.6	4.2	2.1
1-1/2	6.6	6	3
2	7.5	6.8	3.4
3	10.6	9.6	4.8
5	16.7	15.2	7.6
7-1/2	24.2	22	11
10	30.8	28	14
15	46.2	42	21

Induction motors through 15 hp; 20–200 hp and 575 V on the full motor FLA chart.

Box fill allowances (NEC 314.16(B))

Conductor / box	Volume (in³)
14 AWG conductor	2.00
12 AWG conductor	2.25
10 AWG conductor	2.50
8 AWG conductor	3.00
6 AWG conductor	5.00
Device box 3 x 2 x 2-1/2 in	12.5
Octagon 4 x 1-1/2 in	15.5
Device box 3 x 2 x 3-1/2 in	18.0
Square 4 x 1-1/2 in	21.0
Octagon 4 x 2-1/8 in	21.5
Square 4 x 2-1/8 in	30.3
Square 4-11/16 x 2-1/8 in	42.0

Each conductor counts once; EGCs together count once at the largest EGC size; each yoke counts twice. Nonmetallic boxes use the marked volume.

EMT offset multipliers

Bend angle	Multiplier	Shrink (in/in rise)
10°	5.76	0.09
22.5°	2.61	0.20
30°	2	0.27
45°	1.41	0.41
60°	1.15	0.58

Distance between bend marks = offset rise × multiplier. Shrink is exact tan(a/2) per inch of rise.

EMT stub take-up (90° stub-up)

Trade size	Take-up (in)
1/2″ EMT	5
3/4″ EMT	6
1″ EMT	8
1-1/4″ EMT	11

Mark the stub length minus take-up from the free end and line it up with the bender arrow.

Sources

NEC (NFPA 70) 2023 Table 310.16
NEC Tables 430.248 & 430.250
NEC 2023 Table 314.16(B)
EMT bender-head trade multipliers and take-up deducts

Try the Calculators

Conductor Ampacity Calculator (NEC 310.16)Box Fill Calculator (NEC 314.16)Conduit Bending Calculator (Offset, Saddle, Stub-Up)Voltage Drop Calculator

Electrician's Pocket Card — Ampacity, Motor FLA, Box Fill & Bending — reuven.tools/cheat-sheets/electrician-pocket-card — verified against: NEC (NFPA 70) 2023 Table 310.16; NEC Tables 430.248 & 430.250; NEC 2023 Table 314.16(B); EMT bender-head trade multipliers and take-up deducts