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430.37 Devices Other Than Fuses — In Which Conductor
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Where devices other than fuses are used for motor overload protection, Table 430.37 shall govern the minimum allowable number and location of overload units such as trip coils or relays.
Table 430.37 Overload Units
|Kind of Motor||Supply System||Number and Location of Overload Units, Such as Trip Coils or Relays|
|1-phase ac or dc||2-wire, 1-phase ac or dc ungrounded||1 in either conductor|
|1-phase ac or dc||2-wire, 1-phase ac or dc, one conductor grounded||1 in ungrounded conductor|
|1-phase ac or dc||3-wire, 1-phase ac or dc, grounded neutral conductor||1 in either ungrounded conductor|
|1-phase ac||Any 3-phase||1 in ungrounded conductor|
|2-phase ac||3-wire, 2-phase ac, ungrounded||2, one in each phase|
|2-phase ac||3-wire, 2-phase ac, one conductor grounded||2 in ungrounded conductors|
|2-phase ac||4-wire, 2-phase ac, grounded or ungrounded||2, one for each phase in ungrounded conductors|
|2-phase ac||Grounded neutral or 5-wire, 2-phase ac, ungrounded||2, one for each phase in any ungrounded phase wire|
|3-phase ac||Any 3-phase||3, one in each phase*|
|*Exception: An overload unit in each phase shall not be required where overload protection is provided by other approved means.|
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