Swimming Pool Equipment, Spas, Fountains and Hydromassage Bathtubs Marking and Application Guide
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intended to be drained after each use. They are intended for installation in accordance with
Article 680 of the National Electrical Code®, NFPA 70 and model building, plumbing,
mechanical, fuel gas codes, and the manufacturer’s installation instructions.
Units come in three basic designs:
1. Most units are shipped completely assembled from the factory and require only supply
connection in the field.
2. Some units, referred to as ―Knockdown‖ spas, are types for which a spa shell, equipment
assembly and skirt are shipped separately. The shell and equipment assembly are plumbed
at the factory and connected together in the field with threaded unions.
3. Additional units, referred to as ―Modular‖ spas, are similar to ―Knockdown‖ units except
they are plumbed in the field. All parts are provided and pre-cut, if needed, and accompany
applicable instructions and accessories such as polyvinyl chloride (PVC) solvent. They are
intended for assembly by untrained users and the suitability of all interconnections and
wiring is to be determined by authorities having jurisdiction.
―Modular‖ or ―Knockdown‖ designs are accompanied by detailed assembly instructions and
have identifying markings on each sub-assembly. The names or model numbers are
specified in the assembly instructions so the user can correctly assemble the unit and the
inspection authority can determine that the unit was assembled using the correct parts.
5.2. LISTING MARK
The UL Listing Mark includes the product name ―Self-Contained Spa.‖
5.3. FIELD INSTALLATION:
Branch-Circuit Protection. A permanently-wired spa intended to be protected by a branch-
circuit overcurrent device rated less than the maximum rating of the branch-circuit
overcurrent device permitted by the NEC® is marked to indicate the maximum rating of the
branch-circuit overcurrent device for which the unit has been investigated and found
acceptable. The electrical rating includes the minimum supply conductor ampacity and the
ampere rating of the supply conductor overcurrent protective device.
Gas-Fired Heaters. Self-contained spas may be provided with gas fired heaters. Spas with
gas-fired heaters are intended for permanent wiring and permanent installation, and unless
otherwise marked, are intended for outdoor use only.
Options. The installation instructions of self-contained spas may indicate options such as
lighting kits, blowers, additional pumps or ozone generators. These option kits are only to be
used in spas with installation instructions that indicate the spas are factory-wired to
accommodate them.
Supply Connection. Self-contained spas may be cord-connected, convertible or
permanently wired. A convertible spa is shipped from the factory with a power supply cord
but is designed for field conversion to a permanently wired configuration, either 120-volt,
240-volt or both. Once a convertible spa is converted to permanently wired, it is not intended
to be returned to a cord-connected configuration.
Ground-Fault Protection. Cord-connected spas have GFCI protection provided.
