splices or taps shall be made within or on a luminaire.

FPN: For approved means of making connections, see
110.14.
(E) Stranding. Stranded conductors shall be used for wiring on luminaire chains and on other movable or flexible parts.

(F) Tension. Conductors shall be arranged so that the weight of the luminaire or movable parts does not put tension on the conductors.

410.59 Cord-Connected Showcases. Individual show- cases, other than fixed, shall be permitted to be

connected by flexible cord to permanently installed receptacles, and groups of not more than six such showcases shall be permitted to be coupled together by flexible cord and separable locking-type connectors with one of the group connected by flexible cord to a permanently installed receptacle. The installation shall comply with 410.59(A) through (E).

(A) Cord Requirements. Flexible cord shall be of the hard-service type, having conductors not smaller than the branch-circuit conductors, having ampacity at least equal to the branch-circuit overcurrent device, and having an equipment grounding conductor.

FPN: See Table 250.122 for size of equipment grounding conductor.

(B) Receptacles, Connectors, and Attachment Plugs.

Receptacles, connectors, and attachment plugs shall be of a listed grounding type rated 15 or 20 amperes.

(C) Support. Flexible cords shall be secured to the under sides of showcases such that all of the following conditions are ensured:

(1) The wiring is not exposed to physical damage.

(2) The separation between cases is not in excess of 50 mm (2 in.), or more than 300 mm (12 in.) between the first case and the supply receptacle.

(3) The free lead at the end of a group of showcases has a female fitting not extending beyond the case.

(D) No Other Equipment. Equipment other than show cases shall not be electrically connected to showcases.

(E) Secondary Circuit(s). Where showcases are cord- connected, the secondary circuit(s) of each electric- discharge lighting ballast shall be limited to one showcase.

410.62 Cord-Connected Lampholders and Luminaires. (A) Lampholders. Where a metal lampholder is

attached to a flexible cord, the inlet shall be equipped
with an insulating bushing that, if threaded, is not smaller than metric designator 12 (trade size 3/s) pipe size. The cord hole shall be of a size appropriate for the
cord, and all burrs and fins shall be removed in order to provide a smooth bearing surface for the cord.
Bushing having holes 7 mm (%2 in.) in diameter shall be permitted for use with plain pendant cord and holes
11 mm ( l3/32 in.) in diameter with reinforced cord.

(B) Adjustable Luminaires. Luminaires that require ad- justing or aiming after installation shall not be required to be equipped with an attachment plug or cord

connector, provided the exposed cord is of the hard- usage or extra-hard-usage type and is not longer than that required for maximum adjustment. The cord shall not be subject to strain or physical damage.

(C) Electric-Discharge Luminaires.

(1) Cord-Connected Installation. A luminaire or a listed assembly shall be permitted to be cord connected if the following conditions apply:

(1) The luminaire is located directly below the