2014 NEC Changes
First of all, the light fixture must be of a design that does not require GROUNDING (that third green internal conductor in the power cord). The new provision does not address metal light fixtures, but assume that if it is metal, that it will need to be externally BONDED to the grid. Bootleg or homemade bonding attachments are not permitted, so if it is not supplied by the manufacturer, then that fixture is probably not permitted.
The conductors must be ran inside of a conduit - direct burial near the pool is forbidden elsewhere in the NEC. Granted, at the end, the conduit must stub up to allow the wire to exit. A compression seal on the end of the conduit will secure and seal the cord's exit.
Buried wire nut or underground connections are also forbidden. All of the electrical connections must terminate in an approved pool lighting junction box. A typical above grade pool lighting junction box would work fine. One can also use an in-deck junction box, provided it is filled with re-enterable potting compound to prevent water entry.
The transformer must be specifically rated and listed for low voltage lighting around swimming pools (not just fountains). If you utilize a transformer designed for underwater 12 volt pool lighting, then you're guaranteed success.
Local Adoption - Lead Time
Thought the 2014 NEC has been approved on the national level, regional and local authorities usually operate on versions that are 1 or 2 generations older. This is because their government councils have not adopted the current versions. Local authorities have the options of not accepting code changes or making the code more restrictive. So, before specifying or installing lighting close to the water's edge, be sure to check with the local building department.
NEC 2014, Section 680.22(B)(6) states: “Low-Voltage Luminaires. Listed low-voltage luminaires not requiring grounding, not exceeding the low-voltage contact limit, and supplied by listed transformers or power supplies that comply with 680.23(A)(2) are permitted to be located less than 1.5 m (5 ft) from the inside walls of the pool.”
NEC 2014, Section 680.23(A)(2) states that transformers used for low-voltage lighting around pools shall incorporate isolated windings with an ungrounded secondary and a grounded metal barrier between the primary or secondary or double insulation between the primary and secondary windings and shall be listed for swimming pool lighting.
Paolo Benedetti, SWD, Principal
Aquatic Technology Pool and Spa
International Swimming Pool Consulting and Design, Aquatic Consulting, Watershape Consultants, Expert Witness, Hydraulic Design, Landscape Architecture, Construction Management
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