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Illustrated Changes to the NEC, 2002 Edition - Part 2

Article 430

Motors

430.102 Disconnect Means Location

This subsection and its exception were revised, and two Fine Print Notes were added. This subsection now reads:

(B) Motor Disconnect. A disconnecting means must be located in sight from the motor location and the driven machinery location. The controller disconnecting means in accordance with 430.102(A) can serve as the disconnecting means for the motor, if the controller disconnect is located in sight from the motor location. Figure 430-3

Exception: The motor disconnecting means is not required to be in sight from the motor and the driven machinery location under either condition (a) or (b) below, provided the controller disconnecting means required in accordance with 430.102(A) is capable of being individually locked in the open position. The provision for locking or adding a lock to the disconnecting means must be permanently installed on or at the switch or circuit breaker used as the controller disconnecting means. Figure 430-4
(a) Where such a location of the disconnecting means is impracticable or introduces additional or increased hazards to persons or property.
(b) In industrial installations, with written safety procedures, where conditions of maintenance and supervision ensure that only qualified persons will service the equipment.


FPN No. 1: Some examples of increased or additional hazards include, but are not limited to: motors rated in excess of 100 Hp, multi-motor equipment, submersible motors, motors associated with variable frequency drives and motors located in hazardous (classified) locations.

FPN No. 2: For information on lockout/tagout procedures, see NFPA 70E-2000.
Intent: The revised subsection and exception are intended to improve worker safety by requiring the motor disconnecting means to be within sight (within 50 ft) of a motor and its driven machinery location as long as it does not add or increase hazards. There is much less chance that the worker will attempt to work the equipment “hot.” However, (b) of the exception recognizes that industrial establishments have a greater degree of control over the workplace and those facilities that have an effective Lockout/Tagout program could utilize the exception.

The exception also clarifies that the provision for locking the disconnecting means for the controller must be permanently installed on or at the switch or circuit breaker used as the controller disconnecting means so an installer/maintainer can apply it and work safely. For more information, click here for Word document or click here for PDF document.

Author’s Comment: See Article 100 for the definition of “in sight”.


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