30 Hp 460v Motor Amps

As a "rules of thumb" amps horsepower rating tin can be estimated to

115 volts motor - unmarried-stage : 14 amps/hp
230 volts motor - single-phase : 7 amps/hp
230 volts motor - 3-phase : 2.five amps/hp
460 volts motor - 3-stage : 1.25 amps/hp

Always cheque nameplate information before designing protective devices, wiring and switch gear.

Electric motor

Single-Phase Motors - HP and Total-Load Currents

A motor of a given rated horsepower is expected to evangelize that quantity of mechanical power at the motor shaft. Be aware that the motor efficiency is non calculated in to the values for kW and amps below. Motor efficiency must exist considered to avoid undersized ability supply.

Power		Full Load Current (amp)
(hp)	(kW)	115 V	208 V	230 V
1/6	0.13	4.4	ii.iv	ii.2
1/4	0.nineteen	5.eight	three.2	ii.9
one/three	0.25	seven.2	4.0	3.six
ane/2	0.38	9.8	five.iv	4.9
3/4	0.56	xiii.8	7.half dozen	6.ix
1	0.75	16	8.8	8
1 one/2	1.ane	20	xi	10
ii	1.v	24	13.two	12
three	two.iii	34	18.7	17
5	3.8	56	thirty.8	28

Notation that most electrical motors are designed to run at fifty% to 100% of rated load and that maximum efficiency usually is nigh 75% of rated load. For a 1 horsepower (hp) motor the load should typically be in the range 1/two to 1 hp with maximum efficiency at 3/4 hp.

Typical load ranges:

adequate for a short-menstruation: 20 - 120%
acceptable for operating: 50 - 100%
optimum efficiency: threescore - 80%

A motor with a service factor can occasional exist overloaded. Overloading volition over fourth dimension reduce motor efficiency.

Three-Stage Motors - HP and Total-Load Currents

Power		Full-Load Current (amp)
Power		Induction Type Squirrel-Cage and Wound Motor					Synchronous Type Unity Power Factor
(hp)	(kW)	115 V	230 V	460 V	575 V	2300 V	230 V	460 V	575 V	2300 V
1/two	0.38	4	two	1	0.8
3/four	0.56	5.6	2.8	1.four	ane.one
one	0.75	7.2	3.6	1.8	i.four
1 ane/2	1.i	10.4	v.2	2.6	ii.1
ii	1.v	13.6	6.8	3.4	2.seven
3	2.3		9.6	4.8	three.9
5	3.8		fifteen.2	7.vi	6.1
7 i/2	5.6		22	11	9
10	7.v		28	fourteen	xi
15	11		42	21	17
20	15		54	27	22
25	19		68	34	27		53	26	21
30	23		fourscore	40	32		63	32	26
40	30		104	52	41		83	41	33
50	38		130	65	52		104	52	42
sixty	45		154	77	62	xvi	123	61	49	12
75	56		192	96	77	twenty	155	78	62	fifteen
100	75		248	124	99	26	202	101	81	20

ane hp (English language horse power) = 745.7 Due west = 0.746 kW = 550 ft lb/s = two,545 Btu/h = 33.000 ft lb/k = 1.0139 metric equus caballus ability ~= 1.0 KVA

Direct Electric current Motors - Power and Total Load Currents

Power		Direct Electric current (A)
(hp)	(kW)	230 V	440 V
1/4	0.19	0.81	0.42
ane/iii	0.25	1.one	0.56
1/2	0.37	1.half-dozen	0.85
iii/4	0.56	2.4	1.3
1	0.75	3.2	one.7
i ane/ii	one.1	iv.9	2.five
two	one.v	6.5	3.four
three	two.2	9.7	5.1
v	3.vii	sixteen	8.v
seven one/two	5.6	24	13
x	7.v	32	17
15	11	49	25
20	15	65	34
30	22	97	51
50	37	162	85
75	56	243	127
100	75	324	170

for 115V - the amps is twice the amps for 230V