505.17 Flexible Cords and Connections
- Be of a type listed for extra-hard usage
- Contain, in addition to the conductors of the circuit, an equipment grounding conductor complying with 400.23
- Be connected to terminals or to supply conductors in an approved manner
- Be supported by clamps or by other suitable means in such a manner that there will be no tension on the terminal connections
- Be terminated with a listed cord connector that maintains the type of protection where the flexible cord enters boxes, fittings, or enclosures that are required to be explosionproof or flameproof
- Cord entering an increased safety "e" enclosure shall be terminated with a listed increased safety "e" cord connector.
Informational Note: See 400.7 for permitted uses of flexible cords.
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.
Informational Note: See 505.18 for flexible cords exposed to liquids having a deleterious effect on the conductor insulation.
- A switch listed for Zone 2 is provided so that the attachment plug is not depended on to interrupt current, unless the circuit is type "ia," "ib," or "ic" protection, in which case the switch is not required.
- The current does not exceed 3 amperes at 120 volts, nominal.
- The power-supply cord does not exceed 900 mm (3 ft), is of a type listed for extra-hard usage or for hard usage if protected by location, and is supplied through an attachment plug and receptacle of the locking and grounding type.
- Only necessary receptacles are provided.
- The receptacle carries a label warning against unplugging under load.