compound, the reinforc- ing steel shall not be required to be bonded.
(4) Underwater Lighting. All metal forming shells and mounting brackets of no-niche luminaires shall be bonded.
Exception: Listed low-voltage lighting systems with non- metallic forming shells shall not require bonding.
(5) Metal Fittings. All metal fittings within or attached to the pool structure shall be bonded. Isolated parts that are not over 100 mm (4 in.) in any dimension and do not penetrate into the pool structure more than 25 mm (1 in.) shall not require bonding.
(6) Electrical Equipment. Metal parts of electrical equip- ment associated with the pool water circulating system, including pump motors and metal parts of equipment asso- ciated with pool covers, including electric motors, shall be bonded.
Exception: Metal parts of listed equipment incorporating an approved system of double insulation shall not be bonded.
(a) Double-Insulated Water Pump Motors. Where a double-insulated water pump motor is installed under the provisions of this rule, a solid 8 AWG copper conductor of sufficient length to make a bonding connection to a replace ment motor shall be extended from the bonding grid to an accessible point in the vicinity of the pool pump motor. Where there is no connection between the swimming pool bonding grid and the equipment grounding system for the premises, this bonding conductor shall be connected to the equipment grounding conductor of the motor circuit
(b) Pool Water Heaters. For pool water heaters rated at more than 50 amperes and having specific instructions regarding bonding and grounding, only those parts desig nated to be bonded shall be bonded and only those parts designated to be grounded shall be grounded.
(7) Metal Wiring Methods and Equipment. Metal- sheathed cables and raceways, metal piping, and all fixed metal parts shall be bonded.
Exception No. 1: Those separated from the pool by a per- manent barrier shall not be required to be bonded.
Exception No. 2: Those greater than 1.5 m (5 ft) horizontally of the inside walls of the pool shall not be required to be bonded.
Exception No. 3: Those greater than 3.7 m (12 ft) measured vertically above the maximum water level of the pool, or as measured vertically above any observation stands, towers, or platforms, or any diving structures, shall not be required to be bonded.
(C) Pool Water. An intentional bond of a minimum con- ductive surface area of 5806 mm 2 (9 in. 2) shall be installed in contact with the pool water. This bond shall be permitted to consist Of parts that are required to be bonded in
680.26(B).
680.27 Specialized Pool Equipment.
(A) Underwater Audio Equipment. All underwater audio equipment shall be identified for the purpose.
(1) Speakers. Each speaker shall be mounted in an ap- proved metal forming shell, the front of which is enclosed by a captive metal screen, or equivalent, that is bonded to, and secured to, the forming shell by a positive locking device that ensures a low-resistance contact and requires a tool to open for installation or servicing of the speaker. The forming shell