Directed Electronics PS-3655E-FM Especificaciones descargar pdf (Pagina 33)

DE3

CIRCUIT BREAKERS

01/15

DE3-33

Motor Circuit Protectors

Motor Protection Selection Tables

a 8 XHHW requires 3/4 in. conduit

for 3W.

b 200 V motors are commonly

used on 208 V services.

c Ordinary service for normal

starting duty only, acceleration time

of 10 sec. or less.

d Heavy service is jogging or

plugging duty or cycling load with

over 25 starts per hour or over 5

starts per minute. Energy efficient

motors are polyphase motors

defined in NEMA Standard MG1 and

exhibit high starting current.

e NEC 430.22 for Single Motor,

Smaller conductors may be

permitted for light duty-cycle service

per 430.22 (B) Exception No. 1. DC

motors operating from rectified 1Ø

power supply will require larger

conductors per 430.22 (A) Exception

No. 1. For motor-generator arc

welders, see 630.11.

f Motor full load currents thru 200 hp

are taken from NEC Tables 430.147,

148 and 150. Above 200 hp from UL

98. Select wire size, circuit breakers,

or fuses on basis of hp rather than

nameplate full load current per NEC

430.6. Do not use these values to

select overload relay thermal

units. Voltages listed are rated

motor voltages. Corresponding

nominal system voltages are 110–

120 V, 200–208 V, 220–240 V,

440–480 V and 550–600 V.

g Switch size only is shown in table.

Selected fuses should not exceed

maximum percent of full-load current

as given in NEC Table 430.52.

Above 50 hp dc switches are not hp

rated by UL as Motor Circuit

Switches, but as General Use

Switches only and are not

necessarily capable of interrupting

the max. operating overload current

of a motor. See NEC 100 for

definition of General Use Switch.

When protecting a 3Ø, Design E

energy efficient motor, the switch is

required by NEC 430.109 to have a

hp rating of not less than 1.4 times

that of a motor rated 3–100 hp, or not

less than 1.3 times that of a motor

rated over 100 hp. Switches shown

in this table do not necessarily

comply with that requirement.

h Thermal-magnetic circuit breaker

ampere ratings recommended are

approximate for average conditions,

based on trip characteristics of

Square D circuit breakers and NEC

Table 430.52. Under some

conditions, the next size larger switch

or circuit breaker rating may be

necessary to accommodate the

motor starting current and is

permitted by NEC 430.52(C)(1)

Exception 2. High starting currents

are anticipated with Design E and

other energy efficient motors. For

explanation of Code letter markings,

see NEC 430.7(B). For Busway

Plug-in units, see Section DE8.

i Thermal-magnetic breaker

ampere ratings recommended are

approximate for average conditions

and based on trip characteristics of

Square D circuit breakers and NEC

Tables 430.7(B) and 430.52.

jType LC, LI, LX, LXI, and LE

circuit breakers are NOT

recommended for use on single

motor branch circuits.

Contact your local Field Office

for circuit breaker selection on

constant horsepower

multi-speed motors.

Class 601

Selection Tables for Conductors, Safety Switches and Thermal-Magnetic Circuit Breakers Based on 2005 NEC

Tables 430.147, 430.148 & 430.150

Horsepower Ratings

Full Load

Amperage

Amperage of Thermal-Magnetichj

Inver seTime Circuit Breaker

QMBand

Heavy

Duty

Switch

with

Time

Delay

Fusesg

Minimum Size metallic

Conduit 75° C, C Wire Field-

Installed Sized for 125% FLAe

Squirrel-Cage and Wound-

Rotor Motors with Norm.

Tor que Characteritics

Operating at usual Speeds

1Ø

10 Hz ac

Avera ge Direct

Current Motors

Operating at

Base Speed

For Motor Code

Letter B to E

For Motor

Code Letter

FtoVi

AWG

kcmil

Conduit 3 W

3Ø 60 Hz

Ordinary

Servicec

HeavyService

and Energy

Efficientd

THHN

THWN

XHHW

THW

200

Vacb

230

Vac

460

Vac

575

Vac

115

Vac

200

Vacb

230

Vac

120 Vdc 240 Vdc

3/4 6.9 A

15 A

20 A

30 A

14 1/2 in. N/A

1/3 7.2 A

5 3.4 7.6 A

20 A

2 7.8 A

3/4 7.9 A

1 8.0 A

2 8.5 A

7-1/2 9.0 A

25 A

1 9.2 A

1 9.5 A

3 9.6 A

1/2 9.8 A

1-1/2 10.0 A

20 A

3 7-1/2 10 11.0 A

25 A

30 A1-1/2 11.5 A

2 12.0 A

3 12.2 A

25 A 35 A

1-1/2 13.2 A

3/4 2 13.8 A

10 14.0 A

5 15.2 A

30 A

35 A

40 A

1 16.0 A

15 3 2 17.0 A

45 A

12 1/2 in. N/A

5 17.5 A

35 A

3 19.6 A

40 A 50 A

1-1/2 5 20.0 A

40 A15 21.0 A

45 A

60 A

10 1/2 in. N/A

7-1/2 22.0 A

2 24.0 A 45 A

50 A

60 A

3 25.0 A

50 A 70 A

7-1/2 25.3 A

60 A

20 25 27.0 A

10 5 28.0 A

7-1/2 29.0 A

60 A

80 A

8 1/2 in.a N/A

30 32.0 A

70 A10 32.2 A

90 A

25 3 34.0 A

10 38.0 A

80 A

80 A 100 A

7-1/2 5 40.0 A

41.0 A

90 A 110 A

6 3/4 in. 1 in.

15 42.0 A

7--1/2 46.0 A

90 A

110 A

125 A15 48.3 A

10 50.0 A

40 50 52.0 A

150 A

100 A

20 54.0 A

4 1 in. 1 in.

15 55.0 A

5 56.0 A

125 A

10 57.5 A

7-1/2 58.0 A

60 62.0 A

100 A 175 A

20 62.1 A

50 65.0 A

150 A25 68.0 A

20 72.0 A 110 A

200

A 3 1 in. 1-1/4 in.

10 76.0 A 125 A

175 A

60 75 77.0 A

110 A25 78.2 A

30 7-1/2 80.0 A

25 89.0 A

125 A

225 A

200 A

2 1 in. 1-1/4 in.

30 92.0 A

200 A 250 A

75 96.0 A

1 1-1/4 in. 1-1/2 in.

100 99.0 A

150 A10 100.0 A

40 104.0 A

225 A

300 A30 106.0 A

175 A 1/0 1-1/4 in. 1-1/2 in.

40 120.0 A

250 A

100 124.0 A

200 A

350 A 2/0 1-1/2 in. 1-1/2 in.

125 125.0 A 250 A

50 130.0 A

300 A

40 140.0 A

150 144.0 A

400 A

3/0 1-1/2 in. 2 in.

50 150.0 A

60 154.0 A

225 A

350 A125 156.0 A

50 173.0 A

250 A

400 A

4/0 2 in. 2 in.60 177.0 A

400 A 500 A150 180.0 A

75 200 192.0 A 250 2 in. 2 in.

75 221.0 A 300 A 450 A

600 A

300 2 in. 2-1/2 in.

200 240.0 A

350 A 500 A 350 2-1/2 in. 2-1/2 in.250 242.0 A

700 A

100 248.0 A

100 285.0 A

400 A

600 A

800 A

500 3 in. 3 in.300 289.0 A

250 302.0 A

700 A125 312.0 A 450 A (2) 3/0 (2) 2-1/2 in. (2) 2 in.

350 336.0 A 500 A

900 A

(2) 4/0 (2) 2 in. (2) 2 in.

125 359.0 A

600 A

800 A

600 A

150 360.0 A

1000 A300 361.0 A

400 382.0 A

(2)300 (2) 2 in. (2) 2-1/2 in.

150 350 414.0 A 900 A

1200 A

500 472.0 A

800 A

1000 A

(2)

350

(2) 2-1/2 in. (2) 2-1/2 in.400 477.0 A

200 480.0 A

200 552.0 A

1200 A 1600 A —

(3)

300

(3) 2 in. (3) 2-1/2 in.500 590.0 A

900 A

250 602.0 A

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