feeder tables
TRANSCRIPT
Electrical Feeder TablesClass Content
1S 3Ø 3-wire services & 1Ø services2S 3Ø 4-wire services
1F 3Ø 3-wire feeders & 1Ø feeders2F 3Ø 4-wire feeders
1M 1Ø 120V motors1M 1Ø 208V motors1M 1Ø 240V motors3M 3Ø 208V motors3M 3Ø 240V motors3M 3Ø 480V motors
Prepared and distributed by:
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DESIGN &CONSTRUCTION
ENGINEERS
The tables and information contained in thisdocument have been prepared and distributed
by Design & Construction Engineers, LLC for thebenefit of the electrical contracting and engineer-ing community. Design & Construction Engineers,LLC makes no guarantee to the accuracy of theinformation contained.Many of us in the electrical trade and the engi-neering profession must repeatedly determinefeeder sizes for panels, services, and motors. Whenwe do, we have a variety of tools available such asthe standard amperage, conductor characteristics,and conduit fill tables of the NEC. Numerous rulesmust be adhered to such as maximum conductoramperage, conduit fill, and the many laws regard-ing the protection of these conductors as well asthe equipment that they serve.While all electricians and engineers should befamiliar with the application of the NEC rules thatgovern these feeders, much time can be saved byhaving prepared tables for feeders. The minimumcircuit amperage and maximum time-delay fusefor a 208V 3Ø induction motor will always be thesame so why figure it out each time you need it?Naturally, many variable parameters come intoplay with each circumstance. The bare minimumsize conduit needed for a feeder depends on manyfactors. Schedule 40 PVC can hold more conduc-tors than schedule 80. THHN insulated wire hasless cross sectional area than THW. A motor cir-cuit protected by a time delay fuse may not requirea grounding conductor as large as it would if wereprotected by a circuit breaker or non-time delayfuse. Nevertheless, if you find that you need torepeatedly determine various feeders and you stickto some standards, feeder tables such as these cansave many hours of labor re-inventing the wheeland reduce the likelihood of errors.In the creation of these tables, the following stan-dards were incorporated:1. Wire is always assumed to be THW. The vast
majority of wire being installed today is THHNwhich is much smaller. Basing conduit fills onTHW even though THHN will likely be usedhas several advantages. One is that it is a“worst case scenario” so that the conduit willprobably not be too small no matter what insu-lation wire is used. The second is that a con-duit’s available cross section varies with the
conduit material. EMT is the most popular con-duit type but, other than IMC and RMC, allother conduit types have less cross sectionalarea than EMT. Basing the conduit on THWwhile using THHN insures that a code violationwill not result from a conduit transition. Final-ly, feeder conduits based on THW will oftenhave enough spare area that larger or extraconductors might be able to be added in thefuture without replacing the conduit.
2. Conduit is assumed to be EMT as this is themost popular type. Since IMC and RMC areboth larger than the same trade size EMT con-duits, feeders that require threaded conduit dueto specifications or field conditions will still bevalid.
3. Conductors are assumed to be copper. The newAA-8000 aluminum alloy conductors are sup-posed to be very good and resistant to the oxi-dation problems of the old aluminum conduc-tors that led to so many fires in the past. Evenso, copper conductors are still more widelyaccepted for interior wiring.
4. Motor feeder grounding conductors are based onfeeders protected by breakers. Feeders protect-ed by time delay fuses might be able to usesmaller grounding conductors but installing aground based on a breaker allows future flexi-bility for the owner if he should decide toreplace the motor control center or panel in thefuture.
5. All feeders and branch circuits are assumed tohave a copper grounding conductor regardlessof the conduit type. Although the NEC allowsmany metallic conduit types to be used asequipment grounds, the IEEE has determinedthat having a separate insulated equipmentground wire installed within a metallic conduitoffers the very best performance and protectionduring short circuits. The metal conduit pro-vides excellent physical protection as well as aninherent short circuit path should the conduitbe cut into. The insulated ground wire providesa low impedance path to ground which alsomaintains a ground path should a conduit fit-ting break or be improperly installed.
If you should find errors, have questions, or obser-vations on this document, please send an email [email protected].
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General Information and Methods
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3Ø 3-Wire Services and 1Ø Services
Feeder Amperage Designation
1S1 20 3#12 in 1/2” C1S2 25 3#10 in 1/2” C1S2 30 3#10 in 1/2” C1S3 35 3#8 in 3/4” C1S3 40 3#8 in 3/4” C1S3 45 3#8 in 3/4” C1S3 50 3#8 in 3/4” C1S4 60 3#6 in 3/4” C1S5 70 3#4 in 1” C1S5 80 3#4 in 1” C1S6 90 3#3 in 1” C1S6 100 3#3 in 1” C1S7 110 3#2 in 1-1/4” C1S8 125 3#1 in 1-1/4” C1S9 150 3#1/0 in 1-1/2” C
1S10 175 3#2/0 in 1-1/2” C1S11 200 3#3/0 in 2” C1S12 225 3#4/0 in 2” C1S13 250 3#250 in 2” C1S14 300 3#350 in 2-1/2” C -or- 3#1/0 in ea of (2) 1-1/2” C1S15 350 3#500 in 2-1/2” C -or- 3#2/0 in ea of (2) 1-1/2” C1S16 400 3#600 in 3” C -or- 3#3/0 in ea of (2) 2” C1S17 450 3#4/0 in ea of (2) 2” C -or- 3#1/0 in ea of (3) 1-1/2” C1S18 500 3#250 in ea of (2) 2” C -or- 3#2/0 in ea of (3) 1-1/2” C1S19 600 3#350 in ea of (2) 2-1/2” C -or- 3#3/0 in ea of (3) 2” C1S20 700 3#500 in ea of (2) 2-1/2” C -or- 3#250 in ea of (3) 2” C1S21 800 3#600 in ea of (2) 3” C -or- 3#300 in ea of (3) 2-1/2” C1S22 1000 3#400 in ea of (3) 2-1/2” C -or- 3#250 in ea of (4) 2” C1S23 1200 3#600 in ea of (3) 3” C -or- 3#350 in ea of (4) 2-1/2” C1S24 1600 3#600 in ea of (4) 3” C -or- 3#300 in ea of (6) 2-1/2” C1S25 2000 3#600 in ea of (5) 3” C -or- 3#400 in ea of (6) 2-1/2” C1S26 2500 3#600 in ea of (6) 3” C -or- 3#500 in ea of (7) 2-1/2” C1S27 3000 3#500 in ea of (8) 2-1/2” C -or- 3#400 in ea of (9) 2-1/2” C1S28 4000 3#600 in ea of (10) 3” C -or- 3#400 in ea of (12) 2-1/2” C1S29 5000 3#600 in ea of (12) 3” C -or- 3#400 in ea of (15) 2-1/2” C1S30 6000 3#600 in ea of (15) 3” C -or- 3#400 in ea of (18) 2-1/2” C
Method Used
Only conductors that can supply the full amperage listed are used. Often, conductors that are rated less than the main overcurrentdevice can be used if the breaker or fuse is 800 amps or less (NEC 240.4(B)). An example would be 500kcmil used on a 400 ampdevice even though the conductor is only rated at 380 amps. Amperages are taken from the 75º column of Table 310.16 as foundin the 2005 NEC. Note that feeders used as service conductors do not require ground wires. Conduit listed is the minimum EMTsize allowed by NEC for THW insulated wire. Wire sizes larger than 600kcmil are not used as lugs that accept them are not com-monly available for breakers. If the 1Ø service is for a dwelling unit, check Table 310.15(B)(6) for optional conductor sizes.
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3Ø 4-Wire Services
Feeder Amperage Designation
2S1 20 4#12 in 1/2” C2S2 25 4#10 in 3/4” C2S2 30 4#10 in 3/4” C2S3 35 4#8 in 3/4” C2S3 40 4#8 in 3/4” C2S3 45 4#8 in 3/4” C2S3 50 4#8 in 3/4” C2S4 60 4#6 in 1” C2S5 70 4#4 in 1-1/4” C2S5 80 4#4 in 1-1/4” C2S6 90 4#3 in 1-1/4” C2S6 100 4#3 in 1-1/4” C2S7 110 4#2 in 1-1/4” C2S8 125 4#1 in 1-1/2” C2S9 150 4#1/0 in 2” C
2S10 175 4#2/0 in 2” C2S11 200 4#3/0 in 2” C2S12 225 4#4/0 in 2-1/2” C2S13 250 4#250 in 2-1/2” C2S14 300 4#350 in 2-1/2” C -or- 4#1/0 in ea of (2) 2” C2S15 350 4#500 in 3” C -or- 4#2/0 in ea of (2) 2” C2S16 400 4#600 in 3-1/2” C -or- 4#3/0 in ea of (2) 2” C2S17 4502S18 500 4#250 in ea of (2) 2-1/2” C -or- 4#2/0 in ea of (3) 2” C2S19 600 4#350 in ea of (2) 2-1/2” C -or- 4#3/0 in ea of (3) 2” C2S20 700 4#500 in ea of (2) 3” C -or- 4#250 in ea of (3) 2-1/2” C2S21 800 4#600 in ea of (2) 3-1/2” C -or- 4#300 in ea of (3) 2-1/2” C2S22 1000 4#400 in ea of (3) 3” C -or- 4#250 in ea of (4) 2-1/2” C2S23 1200 4#600 in ea of (3) 3-1/2” C -or- 4#350 in ea of (4) 2-1/2” C2S24 1600 4#600 in ea of (4) 3-1/2” C -or- 4#300 in ea of (6) 2-1/2” C2S25 20002S26 25002S27 30002S28 40002S29 50002S30 6000
Method Used
Only conductors that can supply the full amperage listed are used. Often, conductors that are rated less than the main overcurrentdevice can be used if the breaker or fuse is 800 amps or less (NEC 240.4(B)). An example would be 500kcmil used on a 400 ampdevice even though the conductor is only rated at 380 amps. Amperages are taken from the 75º column of Table 310.16 as foundin the 2005 NEC. Note that feeders used as service conductors do not require ground wires. Conduit listed is the minimum EMTsize allowed by NEC for THW insulated wire. Wire sizes larger than 600kcmil are not used as lugs that accept them are not com-monly available for breakers.
3#4/0 in ea of (2) 2-1/2” C -or- 4#1/0 in ea of (3) 2” C
4#600 in ea of (5) 3-1/2” C -or- 4#400 in ea of (6) 3” C4#600 in ea of (6) 3-1/2” C -or- 4#500 in ea of (7) 3” C4#500 in ea of (8) 3” C -or- 4#400 in ea of (9) 3” C4#600 in ea of (10) 3-1/2” C -or- 4#400 in ea of (12) 3” C4#600 in ea of (12) 3-1/2” C -or- 4#400 in ea of (15) 3” C4#600 in ea of (15) 3-1/2” C -or- 4#400 in ea of (18) 3” C
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3Ø 3-Wire Feeders & 1Ø Feeders
Feeder Amperage Designation
1F1 20 3#12 & 1#12 GND in 1/2” C1F2 25 3#10 & 1#10 GND in 3/4” C1F2 30 3#10 & 1#10 GND in 3/4” C1F3 35 3#8 & 1#10 GND in 3/4” C1F3 40 3#8 & 1#10 GND in 3/4” C1F3 45 3#8 & 1#10 GND in 3/4” C1F3 50 3#8 & 1#10 GND in 3/4” C1F4 60 3#6 & 1#10 GND in 1” C1F5 70 3#4 & 1#8 GND in 1-1/4” C1F5 80 3#4 & 1#8 GND in 1-1/4” C1F6 90 3#3 & 1#8 GND in 1-1/4” C1F6 100 3#3 & 1#8 GND in 1-1/4” C1F7 110 3#2 & 1#6 GND in 1-1/4” C1F8 125 3#1 & 1#6 GND in 1-1/2” C1F9 150 3#1/0 & 1#6 GND in 1-1/2” C
1F10 175 3#2/0 & 1#6 GND in 2” C1F11 200 3#3/0 & 1#6 GND in 2” C1F12 225 3#4/0 & 1#4 GND in 2” C1F13 250 3#250 & 1#4 GND in 2-1/2” C1F14 300 3#350 & 1#4 GND in 2-1/2” C -or- 3#1/0 & 1#4 GND in ea of (2) 1-1/2” C1F15 350 3#500 & 1#3 GND in 3” C -or- 3#2/0 & 1#3 GND in ea of (2) 2” C1F16 400 3#600 & 1#3 GND in 3” C -or- 3#3/0 & 1#3 GND in ea of (2) 2” C1F17 450 3#4/0 & 1#2 GND in ea of (2) 2” C -or- 3#1/0 & 1#2 GND in ea of (3) 1-1/2” C1F18 500 3#250 & 1#2 GND in ea of (2) 2-1/2” C -or- 3#2/0 & 1#2 GND in ea of (3) 2” C1F19 600 3#350 & 1#1 GND in ea of (2) 2-1/2” C -or- 3#3/0 & 1#1 GND in ea of (3) 2” C1F20 700 3#500 & 1#1/0 GND in ea of (2) 3” C -or- 3#250 & 1#1/0 GND in ea of (3) 2-1/2” C1F21 800 3#600 & 1#1/0 GND in ea of (2) 3” C -or- 3#300 & 1#1/0 GND in ea of (3) 2-1/2” C1F22 1000 3#400 & 1#2/0 GND in ea of (3) 2-1/2” C -or- 3#250 & 1#2/0 GND in ea of (4) 2-1/2” C1F23 1200 3#600 & 1#3/0 GND in ea of (3) 3” C -or- 3#350 & 1#3/0 GND in ea of (4) 2-1/2” C1F24 1600 3#600 & 1#4/0 GND in ea of (4) 3” C -or- 3#300 & 1#4/0 GND in ea of (6) 2-1/2” C1F25 20001F26 25001F27 30001F28 40001F29 50001F30 6000
Method Used
Only conductors that can supply the full amperage listed are used. Often, conductors that are rated less than the feeder overcurrentdevice can be used if the breaker or fuse is 800 amps or less (NEC 240.4(B)). An example would be 500kcmil used on a 400 ampdevice even though the conductor is only rated at 380 amps. Amperages are taken from the 75º column of Table 310.16 as foundin the 2005 NEC. Conduit listed is the minimum EMT size allowed by NEC for THW insulated wire. Wire sizes larger than600kcmil are not used as lugs that accept them are not commonly available for breakers. If the 1Ø feeder is for a dwelling unit,check Table 310.15(B)(6) for optional conductor sizes.
3#600 & 1#250 GND in ea of (5) 3” C -or- 3#400 & 1#250 GND in ea of (6) 3” C3#600 & 1#350 GND in ea of (6) 3” C -or- 3#500 & 1#350 GND in ea of (7) 3” C3#500 & 1#400 GND in ea of (8) 3” C -or- 3#400 & 1#400 GND in ea of (9) 3” C3#600 & 1#500 GND in ea of (10) 3-1/2” C -or- 3#400 & 1#400 GND in ea of (12) 3” C3#600 & 1#600 GND in ea of (12) 3-1/2” C3#600 & 1#600 GND in ea of (15) 3-1/2” C
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3Ø 4-Wire Feeders
Feeder Amperage Designation
2F1 20 4#12 & 1#12 GND in 1/2” C2F2 25 4#10 & 1#10 GND in 3/4” C2F2 30 4#10 & 1#10 GND in 3/4” C2F3 35 4#8 & 1#10 GND in 1” C2F3 40 4#8 & 1#10 GND in 1” C2F3 45 4#8 & 1#10 GND in 1” C2F3 50 4#8 & 1#10 GND in 1” C2F4 60 4#6 & 1#10 GND in 1” C2F5 70 4#4 & 1#8 GND in 1-1/4” C2F5 80 4#4 & 1#8 GND in 1-1/4” C2F6 90 4#3 & 1#8 GND in 1-1/4” C2F6 100 4#3 & 1#8 GND in 1-1/4” C2F7 110 4#2 & 1#6 GND in 1-1/2” C2F8 125 4#1 & 1#6 GND in 2” C2F9 150 4#1/0 & 1#6 GND in 2” C
2F10 175 4#2/0 & 1#6 GND in 2” C2F11 200 4#3/0 & 1#6 GND in 2” C2F12 225 4#4/0 & 1#4 GND in 2-1/2” C2F13 250 4#250 & 1#4 GND in 2-1/2” C2F14 300 4#350 & 1#4 GND in 3” C -or- 4#1/0 & 1#4 GND in ea of (2) 2” C2F15 350 4#500 & 1#3 GND in 3” C -or- 4#2/0 & 1#3 GND in ea of (2) 2” C2F16 400 4#600 & 1#3 GND in 3-1/2” C -or- 4#3/0 & 1#3 GND in ea of (2) 2-1/2” C2F17 450 4#4/0 & 1#2 GND in ea of (2) 2-1/2” C -or- 4#1/0 & 1#2 GND in ea of (3) 2” C2F18 500 4#250 & 1#2 GND in ea of (2) 2-1/2” C -or- 4#2/0 & 1#2 GND in ea of (3) 2” C2F19 600 4#350 & 1#1 GND in ea of (2) 3” C -or- 4#3/0 & 1#1 GND in ea of (3) 2-1/2” C2F20 700 4#500 & 1#1/0 GND in ea of (2) 3” C -or- 4#250 & 1#1/0 GND in ea of (3) 2-1/2” C2F21 800 4#600 & 1#1/0 GND in ea of (2) 3-1/2” C -or- 4#300 & 1#1/0 GND in ea of (3) 2-1/2” C2F22 1000 4#400 & 1#2/0 GND in ea of (3) 3” C -or- 4#250 & 1#2/0 GND in ea of (4) 2-1/2” C2F23 1200 4#600 & 1#3/0 GND in ea of (3) 3-1/2” C -or- 4#350 & 1#3/0 GND in ea of (4) 3” C2F24 1600 4#600 & 1#4/0 GND in ea of (4) 3-1/2” C -or- 4#300 & 1#4/0 GND in ea of (6) 3” C2F25 20002F26 25002F27 30002F28 40002F29 50002F30 6000
Method Used
Only conductors that can supply the full amperage listed are used. Often, conductors that are rated less than the feeder overcurrentdevice can be used if the breaker or fuse is 800 amps or less (NEC 240.4(B)). An example would be 500kcmil used on a 400 ampdevice even though the conductor is only rated at 380 amps. Amperages are taken from the 75º column of Table 310.16 as foundin the 2005 NEC. Conduit listed is the minimum EMT size allowed by NEC for THW insulated wire. Wire sizes larger than600kcmil are not used as lugs that accept them are not commonly available for breakers.
4#600 & 1#250 GND in ea of (5) 3-1/2” C -or- 4#400 & 1#250 GND in ea of (6) 3” C4#600 & 1#350 GND in ea of (6) 3-1/2” C -or- 4#500 & 1#350 GND in ea of (7) 3-1/2” C4#500 & 1#400 GND in ea of (8) 3-1/2” C -or- 4#400 & 1#400 GND in ea of (9) 3” C4#600 & 1#500 GND in ea of (10) 4” C -or- 4#400 & 1#400 GND in ea of (12) 3” C4#600 & 1#600 GND in ea of (12) 4” C4#600 & 1#600 GND in ea of (15) 4” C
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The
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The
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scon
nect
size
that
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ualt
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larg
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onne
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the
smal
lest
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nho
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uits
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The
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248.
The
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seis
this
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ded
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imum
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ualt
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imum
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the
smal
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ctth
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nho
ldth
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otec
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htin
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atin
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dot
her
circ
uits
that
are
nots
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ctto
tem
pora
rysu
rges
and
whe
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ircui
tcur
rent
sar
elo
w.N
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me
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ses
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gene
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175%
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the
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rote
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stan
tane
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ripbr
eake
r)is
gene
rally
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rcui
tdes
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MC
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mot
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brea
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122
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rmis
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eto
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rmis
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A(1
5/3)
3#12
&1#
12G
ND
in1/
2”C
6.0A
2H
P20
A8.
5A25
A15
A20
A(2
0/3)
3#12
&1#
12G
ND
in1/
2”C
6.8A
3H
P20
A12
.0A
30A
20A
25A
(25/
3)3#
12&
1#12
GN
Din
1/2”
C9.
6A5
HP
20A
19.0
A50
A30
A40
A(4
0/3)
3#12
&1#
12G
ND
in1/
2”C
15.2
A7-
1/2
HP
30A
27.5
A70
A40
A60
A(6
0/3)
3#10
&1#
10G
ND
in3/
4”C
22A
10H
P60
A35
.0A
90A
50A
70A
(70/
3)3#
8&
1#8
GN
Din
3/4”
C28
A
VApe
rP
hase
305
443
582
831
942
1330
2106
3048
3880
Typi
calC
ircui
tDes
igna
tion
15H
P60
A52
.5A
150A
80A
110A
(110
/3)3
#6&
1#6
GN
Din
1”C
42A
5820
20A
Min
Fusi
ble
Dis
c
20A
20A
20A
20A
20A
30A
60A
60A
100A
25H
P10
0A85
.0A
225A
125A
175A
(175
/3)3
#4&
1#6
GN
Din
1-1/
4”C
68A
9422
200A
3M1
3M1
3M1
3M1
3M1
3M1
3M1
3M2
3M3
3M4
3M5
3M5
20H
P10
0A67
.5A
175A
100A
150A
(150
/3)3
#4&
1#6
GN
Din
1-1/
4”C
54A
7482
100A
40H
P20
0A13
0A35
0A20
0A30
0A(3
00/3
)3#1
&1#
4G
ND
in1-
1/2”
C10
4A14
410
200A
3M6
3M8
30H
P10
0A10
0A25
0A15
0A20
0A(2
00/3
)3#3
&1#
6G
ND
in1-
1/4”
C80
A11
085
200A
60H
P20
0A19
3A50
0A30
0A40
0A(4
00/3
)3#3
/0&
1#3
GN
Din
2”C
154A
2133
840
0A3M
103M
1150
HP
200A
163A
400A
250A
350A
(350
/3)3
#2/0
&1#
3G
ND
in2”
C13
0A18
013
400A
100
HP
400A
310A
800A
450A
700A
(700
/3)3
#350
&1#
1/0
GN
Din
2-1/
2”C
248A
3436
360
0A3M
133M
1675
HP
400A
240A
600A
350A
500A
(500
/3)3
#250
&1#
2G
ND
in2-
1/2”
C19
2A26
604
400A
150
HP
600A
450A
1200
A70
0A10
00A
(100
0/3)
3#4/
0&
1#2/
0G
ND
inea
of(2
)2-1
/2”
C36
0A49
882
800A
3M18
3M19
125
HP
400A
390A
1000
A60
0A80
0A(8
00/3
)3#3
/0&
1#1/
0G
ND
inea
of(2
)2”
C31
2A43
231
600A
3M21
200
HP
600A
600A
1600
A10
00A
1200
A(1
200/
3)3#
350
&1#
3/0
GN
Din
eaof
(2)2
-1/2
”C
480A
6650
910
00A
ww
w.d
ceng
inee
rs.c
om11
of12
11/2
1/20
07
Met
hod
Use
d
The
FLA
(Ful
lLoa
dA
mps
)is
take
nfr
omN
ECTa
ble
430.
250.
The
VApe
rph
ase
isth
isFL
Am
ultip
lied
by13
8.56
.The
min
imum
non-
fuse
ddi
scon
nect
isth
efir
stst
anda
rddi
scon
nect
size
that
iseq
ualt
oor
larg
erth
an11
5%of
the
FLA
.The
min
imum
fusi
ble
disc
onne
ctis
the
smal
lest
stan
dard
disc
onne
ctth
atca
nho
ldth
em
axim
umtim
ede
lay
fuse
.Th
eM
CA
(Min
imum
Circ
uitA
mpa
city
)is1
25%
ofth
eFL
Am
akin
git
poss
ible
fort
heM
CA
tobe
slig
htly
larg
erth
anth
em
inim
umdi
scon
nect
.The
max
imum
non-
time
dela
yfu
seis
300%
ofth
eFL
Aor
the
next
larg
erst
anda
rdfu
se.N
on-ti
me
dela
yfu
ses
may
beus
edto
prot
ectl
ight
ing,
heat
ing,
and
othe
rcirc
uits
that
are
nots
ubje
ctto
tem
pora
rysu
rges
and
whe
resh
ortc
ircui
tcur
rent
sar
elo
w.N
on-ti
me
dela
yfu
ses
are
gene
rally
nots
uita
ble
form
otor
s.Th
em
axim
umtim
ede
lay
ordu
alel
emen
tfus
eis
175%
ofth
eFL
Aor
the
next
larg
erst
anda
rdfu
se.T
hem
axim
umbr
eake
ris
250%
ofth
eFL
Aor
the
next
larg
erst
anda
rdbr
eake
rsi
ze.A
lthou
ghno
tlis
ted
inth
ech
art,
the
max
imum
MC
P(m
otor
circ
uit
prot
ecto
rori
nsta
ntan
eous
trip
brea
ker)
isge
nera
lly80
0%of
the
FLA
.The
circ
uitd
esig
natio
nis
base
dup
onco
nduc
tors
able
topr
ovid
eth
eM
CA
from
the
max
imum
brea
ker.
Ifth
em
otor
isbe
ing
fed
from
afu
sera
ther
than
abr
eake
rand
Tabl
e25
0.12
2al
low
sit,
itm
aybe
perm
issi
ble
tous
ea
smal
lerg
roun
dw
ire.
480V
3ØM
otor
s
HP
FLA
1/2
HP
Feed
erN
um.
20A
Min
Non
-fuse
dD
isc
1.4A
MC
A
15A
Max
NO
NFu
se15
A
Max
Tim
eD
.Fu
se15
A
Max
Bre
aker
(15/
3)3#
12&
1#12
GN
Din
1/2”
C1.
1A3/
4H
P20
A2.
0A15
A15
A15
A(1
5/3)
3#12
&1#
12G
ND
in1/
2”C
1.6A
1H
P20
A2.
6A15
A15
A15
A(1
5/3)
3#12
&1#
12G
ND
in1/
2”C
2.1A
1-1/
2H
P20
A3.
8A15
A15
A15
A(1
5/3)
3#12
&1#
12G
ND
in1/
2”C
3.0A
2H
P20
A4.
2A15
A15
A15
A(1
5/3)
3#12
&1#
12G
ND
in1/
2”C
3.4A
3H
P20
A6.
0A15
A15
A15
A(1
5/3)
3#12
&1#
12G
ND
in1/
2”C
4.8A
5H
P20
A9.
5A25
A15
A20
A(2
0/3)
3#12
&1#
12G
ND
in1/
2”C
7.6A
7-1/
2H
P20
A13
.8A
35A
20A
30A
(30/
3)3#
12&
1#12
GN
Din
1/2”
C11
A10
HP
20A
17.5
A45
A25
A35
A(3
5/3)
3#12
&1#
12G
ND
in1/
2”C
14A
VApe
rP
hase
305
443
582
831
942
1330
2105
3047
3878
Typi
calC
ircui
tDes
igna
tion
15H
P30
A26
.2A
70A
40A
60A
(60/
3)3#
10&
1#10
GN
Din
3/4”
C21
A58
17
20A
Min
Fusi
ble
Dis
c
20A
20A
20A
20A
20A
20A
20A
30A
60A
25H
P60
A42
.5A
110A
60A
90A
(90/
3)3#
8&
1#8
GN
Din
3/4”
C34
A94
1860
A
3M1
3M1
3M1
3M1
3M1
3M1
3M1
3M1
3M1
3M2
3M3
3M3
20H
P60
A33
.8A
90A
50A
70A
(70/
3)3#
8&
1#8
GN
Din
3/4”
C27
A74
7960
A
40H
P60
A65
.0A
175A
100A
150A
(150
/3)3
#6&
1#6
GN
Din
1”C
52A
1440
410
0A3M
33M
430
HP
60A
50.0
A12
5A70
A10
0A(1
00/3
)3#8
&1#
8G
ND
in3/
4”C
40A
1108
010
0A
60H
P10
0A96
.2A
250A
150A
200A
(200
/3)3
#3&
1#6
GN
Din
1-1/
4”C
77A
2132
920
0A3M
53M
650
HP
100A
81.2
A20
0A12
5A17
5A(1
75/3
)3#4
&1#
6G
ND
in1-
1/4”
C65
A18
005
200A
100
HP
200A
155A
400A
225A
350A
(350
/3)3
#2/0
&1#
3G
ND
in2”
C12
4A34
348
400A
3M8
3M10
75H
P20
0A12
0A30
0A17
5A25
0A(2
50/3
)3#1
&1#
4G
ND
in1-
1/2”
C96
A26
592
200A
150
HP
400A
225A
600A
350A
450A
(450
/3)3
#4/0
&1#
2G
ND
in2”
C18
0A49
860
400A
3M11
3M12
125
HP
200A
195A
500A
300A
400A
(400
/3)3
#3/0
&1#
3G
ND
in2”
C15
6A43
212
400A
3M15
200
HP
400A
300A
800A
450A
600A
(600
/3)3
#350
&1#
1G
ND
in2-
1/2”
C24
0A66
480
600A
ww
w.d
ceng
inee
rs.c
om12
of12
11/2
1/20
07
Met
hod
Use
d
The
FLA
(Ful
lLoa
dA
mps
)is
take
nfr
omth
e46
0Vco
lum
nof
NEC
Tabl
e43
0.25
0.Th
e48
0Vm
otor
son
the
NEC
tabl
ego
esup
to50
0H
Pbu
tthi
sfe
eder
tabl
est
ops
at20
0H
P.Th
eVA
per
phas
eis
this
FLA
mul
tiplie
dby
277.
The
min
imum
non-
fuse
ddi
scon
nect
isth
efir
stst
anda
rddi
scon
nect
size
that
iseq
ualt
oor
larg
erth
an11
5%of
the
FLA
.The
min
imum
fusi
ble
disc
onne
ctis
the
smal
lest
stan
dard
disc
onne
ctth
atca
nho
ldth
em
axim
umtim
ede
lay
fuse
.The
MC
A(M
inim
umC
ircui
tAm
paci
ty)i
s125
%of
the
FLA
mak
ing
itpo
ssib
lefo
rthe
MC
Ato
besl
ight
lyla
rger
than
the
min
imum
disc
onne
ct.T
hem
axim
umno
n-tim
ede
lay
fuse
is30
0%of
the
FLA
orth
ene
xtla
rger
stan
dard
fuse
.Non
-tim
ede
lay
fuse
sm
aybe
used
topr
otec
tlig
htin
g,he
atin
g,an
dot
her
circ
uits
that
are
nots
ubje
ctto
tem
pora
rysu
rges
and
whe
resh
ortc
ircui
tcur
rent
sar
elo
w.N
on-ti
me
dela
yfu
ses
are
gene
rally
nots
uita
ble
form
otor
s.Th
em
axim
umtim
ede
lay
ordu
alel
emen
tfus
eis
175%
ofth
eFL
Aor
the
next
larg
erst
anda
rdfu
se.T
hem
axim
umbr
eake
ris2
50%
ofth
eFL
Aor
the
next
larg
erst
anda
rdbr
eake
rsiz
e.A
lthou
ghno
tlis
ted
inth
ech
art,
the
max
imum
MC
P(m
otor
circ
uitp
rote
ctor
orin
stan
tane
oust
ripbr
eake
r)is
gene
rally
800%
ofth
eFL
A.T
heci
rcui
tdes
igna
tion
isba
sed
upon
cond
ucto
rsab
leto
prov
ide
the
MC
Afr
omth
em
axim
umbr
eake
r.If
the
mot
oris
bein
gfe
dfr
oma
fuse
rath
erth
ana
brea
kera
ndTa
ble
250.
122
allo
wsi
t,it
may
bepe
rmis
sibl
eto
use
asm
alle
rgro
und
wire
.