AIM Manual

Motor Application » Single-Phase Motors (Page 11)

Cable Selection 2-Wire or 3-Wire

Table 11
Motor Rating 60 °C Insulation - AWG Copper Wire Size
VoltshpkW1412108643210000000000
1151/20.371001602503906209601190146017802160263031403770
2301/20.3740065010201610251038804810588071708720
3/40.5530048076012001870289035804370533064707870
10.752504006309901540238029603610441053606520
1.51.11903104807701200187023202850350042805240
21.5150250390620970153019102360293036204480
32.2120190300470750119014901850232028903610
53.70018028045071089011101390174021702680
7.55.5000200310490610750930114014101720
107.50000250390490600750930116014301760
1511000017027034043053066082010201260
Table 11A
Motor Rating 75 °C Insulation - AWG Copper Wire Size
VoltshpkW1412108643210000000000
1151/2.371001602503906209601190146017802160263031403770
2301/2.3740065010201610251038804810588071708720
3/4.55300480760120018702890358043705330647078709380
1.75250400630990154023802960361044105360652077809350
1.51.1190310480770120018702320285035004280524063007620
21.515025039062097015301910236029303620448054706700
32.212019030047075011901490185023202890361044705550
53.70110180280450710890111013901740217026803330
7.55.5001202003104906107509301140141017202100
107.5000160250390490600750930116014301760
1511000017027034043053066082010201260
  • 1 Foot = .3048 Meter

Lengths in BOLD only meet the US National Electrical Code ampacity requirements for individual conductors 60 °C or 75 °C in free air or water, not in magnetic enclosures, conduit or direct buried.

Lengths NOT in bold meet the NEC ampacity requirements for either individual conductors or jacketed 60 °C or 75 °C cable and can be in conduit or direct buried. Flat molded and web/ribbon cable are considered jacketed cable.

If any other cable is used, the NEC and local codes should be observed.

Cable lengths in Tables 11 & 11A allow for a 5% voltage drop running at maximum nameplate amperes. If 3% voltage drop is desired, multiply Table 11 and 11A lengths by 0.6 to get maximum cable length.

The portion of the total cable length, which is between the supply and single-phase control box with a line contactor, should not exceed 25% of total maximum allowable to ensure reliable contactor operation. Single-phase control boxes without line contactors may be connected at any point in the total cable length.

Tables 11 & 11A are based on copper wire. If aluminum wire is used, it must be two sizes larger than copper wire and oxidation inhibitors must be used on connections.

Example: If Tables 11 & 11A call for #12 copper wire, #10 aluminum wire would
be required.

Contact Franklin Electric for 90 °C cable lengths.

See pages 15, 50, and 51 for applications using 230 V motors on 208 V power systems.