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This is a waste water treatment facility.

501.11 Flexible Cords, Class I, Divisions 1 and 2.

A flexible cord shall be permitted for connection between portable lighting equipment or other portable utilization equipment and the fixed portion of their supply circuit.

Flexible cord shall also be permitted for that portion of the circuit where the fixed wiring methods of 501.4(A) cannot provide the necessary degree of movement for fixed and mobile electrical utilization equipment, in an industrial establishment where conditions of maintenance and engineering supervision ensure that only qualified persons install and service the installation, and the flexible cord is protected by location or by a suitable guard from damage. The length of the flexible cord shall be continuous.

Where flexible cords are used, the cords shall be as follows:

(1) Of a type listed for extra-hard usage
(2) Contain, in addition to the conductors of the circuit, a grounding conductor complying with 400.23

(3) Connected to terminals or to supply conductors in an approved manner

(4) Supported by clamps or by other suitable means in such a manner that there is no tension on the terminal connections

(5) Provided with suitable seals where the flexible cord enters boxes, fittings, or enclosures of the explosionproof type

Exception: As provided in 501.3(B)(6) and 501.4(B).

Electric submersible pumps with means for removal without entering the wet-pit shall be considered portable utilization equipment.

The extension of the flexible cord within a suitable raceway between the wet-pit and the power source shall be permitted.

FPN:See 501.13 for flexible cords exposed to liquids having a deleterious effect on the conductor insulation.

Joe Tedesco, NEC Consultant