41
DO NOT DIVE.
100
DO NOT DIVE.
ELECTRICAL REQUIREMENTS
This configuration requires 2 independent, dedicated services,
a 240V, 50A Service (non-GFCI) & a 240V, 30A GFCI Service
HAVE YOUR ELECTRICIAN READ THE FOLLOWING INFORMATION
BEFORE INSTALLATION BEGINS
Electrical connections made improperly, or the use of wire gauge sizes for incurring power
which are too small, may continually blow fuses in the electrical equipment box, may damage
the internal electrical controls and components, may be unsafe and in any case will void your
warranty.
It is the responsibility of the swim spa owner to ensure that electrical connections are made
by a qualified electrician in accordance with the National Electrical Code and any local and state
electrical codes in force at the time of installation.
These connections must be made in accordance with the wiring diagrams found inside the
control box. This equipment has been designed to operate on 60Hz. alternating current only,
240 volts are required. Make sure that power is not applied while performing any electrical
installation. A copper bonding lug has been provided on the electrical equipment pack to allow
connection to local ground points. The ground wire must be at least 8 AWG copper wire and
must be connected securely to a grounded metal structure such as a cold water pipe. The supply
wiring to the swim spa must utilize a symmetrically grounded system. The swim spa must not be
wired to electrical systems utilizing no ground (IT) or TN-C grounding. Be sure to have a licensed
electrician examine and ensure proper grounding is provided. All Master Spas equipment packs
are wired for 240 VAC only. Each of the electrical services for your swim spa must include a
properly rated switch or circuit breaker to open all non-grounded supply conductors to comply
with section 422-20 of the National Electrical Code. A disconnect must be installed and be
readily accessible to the swim spa occupants, but installed at least five feet from the swim spa.
A Ground-Fault circuit interrupter (GFCI) must be used to comply with section 680-42 of the
National Electric Code. A ground fault is a current leak from any one of the supply conductors
to ground. A GFCI is designed to automatically shut off power to a piece of equipment when a
ground fault is detected. The MP Swim Spas are equipped from the factory with a pre-installed
50A internal GFCI breaker and will not need to have one installed for the 50A service.
The 50A non-GFCI protected service must be 240 volt, 3 wire plus ground (#6 AWG copper with
minimum #8 AWG copper ground). The 30A GFCI protected service must be 240 volt, 3 wire
plus ground (#8 AWG copper).
Route services in to the swim spa junction box located inside the swim spa behind skirt access
panel “B” (see Glossary of Swim Spa Terminology). Refer to wiring schematic inside swim spa
junction box for proper power connections to terminals. The MP Swim Spas are equipped from
the factory with a pre-installed 50A GFCI breaker to power the propulsion system and spa
side equipment. The 50A non-GFCI protected service shall be connected to the appropriate
terminals within the swim spa junction box which feed the internal 50A GFCI. The 30A GFCI
protected service shall be connected to the appropriate terminals within the swim spa junction
box to power the swim side equipment control system. These must be “dedicated” services. The
term “dedicated” means the electrical circuit for the swim spa is not being used for any other
electrical items (patio lights, appliances, garage circuits, etc.). If the swim spa is connected to a
non-dedicated circuit, overloading will result in “nuisance tripping” which requires resetting of
the breaker switch at the house electrical panel.
201412
ELECTRICAL REQUIREMENTS
CONFIGURATION 5 - 240V, 50A SERVICE & 240V, 30A GFCI SERVICE
NOTE: Electrical requirements by model is shown in Model Specifications. Only electrical
configurations pertaining to the models referenced in this manual are shown.