Rheem 953060DP Owner's Manual And Installation Instructions page 11

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The power supply wires are to be directly connected to the terminal
block, with no excess wire loops inside the front cover. The
temperature rating of the power supply wires insulation must suit
this application.
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in compliance with all local codes and regulatory authority requirements.
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in New Zealand also conforming to Clauses G12 and H1 of the New
Zealand Building Code.
Installation and commissioning requirements and details for the installing
plumber and licensed electrical worker are contained on pages 28 to 75.
Mains pressure water supply
The water heater is designed to operate at mains pressure by connecting directly
to the mains water supply.
Refer to the table on page 30 for relief valve operating pressures and maximum
supply pressures.
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