NEC Motor FLC Tables — 430.248 & 430.250 Full-Load Currents

Horsepower	115Volts	200Volts	208Volts	230Volts
1/6	4.4	2.5	2.4	2.2
1/4	5.8	3.3	3.2	2.9
1/3	7.2	4.1	4.0	3.6
1/2	9.8	5.6	5.4	4.9
3/4	13.8	7.9	7.6	6.9
1	16	9.2	8.8	8.0
112	20	11.5	11.0	10
2	24	13.8	13.2	12
3	34	19.6	18.7	17
5	56	32.2	30.8	28
712	80	46.0	44.0	40
10	100	57.5	55.0	50

Horsepower

115Volts

200Volts

208Volts

230Volts

1/6

4.4

2.5

2.4

2.2

1/4

5.8

3.3

3.2

2.9

1/3

7.2

4.1

4.0

3.6

1/2

9.8

5.6

5.4

4.9

3/4

13.8

7.9

7.6

6.9

9.2

8.8

8.0

112

11.5

11.0

13.8

13.2

19.6

18.7

32.2

30.8

712

46.0

44.0

100

57.5

55.0

Three-phase — 430.250

Horsepower	Induction-Type Squirrel Cage and Wound Rotor (Amperes)							Synchronous-Type Unity PowerFactor* (Amperes)
Horsepower	115 Volts	200 Volts	208 Volts	230 Volts	460 Volts	575 Volts	2300 Volts	230 Volts	460 Volts	575 Volts	2300 Volts
1/2	4.4	2.5	2.4	2.2	1.1	0.9	—	—	—	—	—
3/4	6.4	3.7	3.5	3.2	1.6	1.3	—	—	—	—	—
1	8.4	4.8	4.6	4.2	2.1	1.7	—	—	—	—	—
112	12.0	6.9	6.6	6.0	3.0	2.4	—	—	—	—	—
2	13.6	7.8	7.5	6.8	3.4	2.7	—	—	—	—	—
3	—	11.0	10.6	9.6	4.8	3.9	—	—	—	—	—
5	—	17.5	16.7	15.2	7.6	6.1	—	—	—	—	—
712	—	25.3	24.2	22	11	9	—	—	—	—	—
10	—	32.2	30.8	28	14	11	—	—	—	—	—
15	—	48.3	46.2	42	21	17	—	—	—	—	—
20	—	62.1	59.4	54	27	22	—	—	—	—	—
25	—	78.2	74.8	68	34	27	—	53	26	21	—
30	—	92	88	80	40	32	—	63	32	26	—
40	—	120	114	104	52	41	—	83	41	33	—
50	—	150	143	130	65	52	—	104	52	42	—
60	—	177	169	154	77	62	16	123	61	49	12
75	—	221	211	192	96	77	20	155	78	62	15
100	—	285	273	248	124	99	26	202	101	81	20
125	—	359	343	312	156	125	31	253	126	101	25
150	—	414	396	360	180	144	37	302	151	121	30
200		552	528	480	240	192	49	400	201	161	40
250	—	—	—	—	302	242	60	—	—	—	—
300	—	—	—	—	361	289	72	—	—	—	—
350	—	—	—	—	414	336	83	—	—	—	—
400	—	—	—	—	477	382	95	—	—	—	—
450	—	—	—	—	515	412	103	—	—	—	—
500	—	—	—	—	590	472	118	—	—	—	—

Notes that change the answer — 430.250

*For 90 and 80 percent power factor, the figures shall be multiplied by 1.1 and 1.25, respectively.

Race your codebook — 3 lookups on this table

A rooftop package HVAC unit's nameplate covers a compressor plus a shaded-pole condenser fan motor. Instead of using the fan motor's horsepower rating, the nameplate lists a full-load current specifically for sizing the branch-circuit conductors, disconnect, and short-circuit/ground-fault protection. Which section establishes that this marked current, not horsepower, governs those ampacity determinations?

A 440.4(B)
B 440.6(B)
C 440.7
D 440.6(A)

Show answer & explanation

Correct: B — 440.6(B)

440.6(B) is the ampacity/rating rule that requires using the marked full-load current of a shaded-pole or PSC fan/blower motor (instead of horsepower) to size the disconnect, branch-circuit conductors, controller, and short-circuit/ground-fault and overload protection. 440.4(B) is the marking requirement telling the manufacturer what to put on the nameplate, not the ampacity-determination rule itself, and 440.6(A) covers hermetic compressor ampacity, not fan/blower motors.

An electrician sizing conductors for multimotor equipment with a permanent split-capacitor blower motor finds the equipment nameplate current is lower than the number stamped on the blower motor's own nameplate. Which section sets the minimum allowable value for the equipment-nameplate marking used for this ampacity determination?

A 440.12(B)(2)
B 440.4(B)
C 440.6(B)
D 440.4(C)

Show answer & explanation

Correct: C — 440.6(B)

440.6(B) states the equipment nameplate marking used for ampacity/rating purposes shall not be less than the current marked on the fan or blower motor's own nameplate. 440.12(B)(2) addresses rating and interrupting capacity for combination loads using full-load current equivalents, a different determination, and 440.4(C) covers branch-circuit selection current for compressors, not fan/blower motor ampacity.

A technician is sizing a disconnecting means for a single hermetic refrigerant motor-compressor. The nameplate rated-load current is 20 A and the branch-circuit selection current is 23 A. Which section specifies how to determine the minimum ampere rating of the disconnect from these values?

A 440.12(B)(2)
B 440.12(A)(1)
C 440.12(A)(2)
D 440.6(A)

Show answer & explanation

Correct: B — 440.12(A)(1)

440.12(A)(1) gives the 115 percent rule using the greater of rated-load current or branch-circuit selection current. 440.6(A) only addresses ampacity/rating of conductors and other equipment, not the disconnect's ampere rating, and 440.12(B)(2) covers combination-load full-load current equivalents, not a single hermetic compressor.

Motor full-load current tables — 430.248 / 430.250

Single-phase — 430.248

Three-phase — 430.250

Race your codebook — 3 lookups on this table

Every table. Timed lookups. Spaced repetition.

Motor full-load current tables — 430.248 / 430.250

Single-phase — 430.248

Three-phase — 430.250

Race your codebook — 3 lookups on this table

Keep going

Every table. Timed lookups. Spaced repetition.