50 amp to 30 amp adapter
30 amp to 20 amp adapter
50 amp to 20 amp adapter
SHORE POWER
Most RV parks provide 30 Amp, 120 Volt at the site; however, many
parks also provide 50 Amp, 240 Volt service to accommodate the
electrical needs of newer and larger coaches. Shore power is supplied
to the coach via a power cord. Two sizes of power cords are found in
Newmar coaches: 50 Amp and 30 Amp. The 50 Amp cords are made
up of four conductors #8 stranded wire and a molded plug. The 30
Amp cords are made up of three conductors #10 stranded wire and a
molded plug.
Shore power enters through the 30 or 50 Amp power cord to the
power cord reel (if equipped). From the power cord reel, it travels to
the transfer switch and then to the main breaker box where it is
dispersed to the individual circuits to supply power to hard-wired
components such as air conditioners, water heaters, etc. and then to
the inverter (if equipped).
The inverted circuits move from the inverter's internal transfer switch
to the inverter subpanel (a smaller breaker box). From the subpanel,
the power circulates to the individual breakers and to the electrical
outlets and appliances.
SHORE POWER ADAPTERS
IMPORTANT
Newmar Corporation does not recommend use of adapter, cheater, or dog-bone style connectors that will
modify the existing shore power cord to a different style of outlet. Use of this type of adapter will greatly
reduce the amount of available current in the unit, as well as create the potential for electrical failure and/or
fire.
If an adapter is used, there are three common sizes of
power cord adapters available to adjust to a smaller
amperage outlet:
1. 30 amp to 20 amp
2. 50 amp to 20 amp
3. 50 amp to 30 amp
It is important to understand the risks involved and the possible effects of using adapters in conjunction with your coach.
Some of these risks and possible effects include:
• Melted or damaged adapters causing poor connection (or no connection at all)
• Melted or damaged 30 or 50 Amp plugs causing fluctuations in voltage that may damage electronics
• Insufficient amperage causing the tripping of a breaker at the post or a limited use of appliances
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