Breaker current ratings are current set points in which the breaker is
designed to operate. The internal configuration of the circuit breaker is designed
to trip when excess current is drawn through the breaker. The trip action of the
circuit breaker can occur within milliseconds due to the speed at which electric-
ity can travel. Breaker ratings are set to operate on a continuous load at 80% of
the breaker’s rated capacity. For example: A breaker with a 20 amp rating will
handle a continuous load of 16 amps. This designed set point is when an induc-
tive load is applied, such as when an electric motor turns on. As the motor starts
to spin current consumption may momentarily exceed the rated capacity of the
breaker. As the electric motor comes up to operating speed the electric motor’s
current consumption will fall. The AC current load then falls back into the
breaker’s rated 80% set point. This electric principle should be kept in mind
when using anything other than 50 amp shore service and using appliances with
electric motors. When using outlets, care should be considered when applying
loads such as electric motors, heaters, coffee makers, toasters, hair dryer or
other large current consuming loads. If the current rating of a load is not known
it is usually stated on most electrical items. The rating will either be in amps or
watts. Current ratings stated on electrical items will change slightly with volt-
age fluctuations. As voltage increases, current consumption decreases. A volt-
age decreases, current consumption increases. This may explain why in some
instances items operated at borderline voltage to current tolerances may seem
fine in one location, but problematic in another.
NOTE: To calculate watts to amps, simply divide the watt
figure by the voltage of which the item operates from. For
example: The electrical item is rated at 1,370 watts. Divide
that by the operating voltage of 115 volts which equals 11.913
amps. Use this formula to calculate load to current supply
ratio.
The Energy Management System is easily identified by the remote display
panel located in the inside overhead compartment next to the entrance door.
The 50 Amp Smart EMS consists of two elements: the display panel and the
bedroom distribution panel. The display panel is mounted in the inside over-
head compartment next to the entrance door. The distribution panel, located in
the bedroom, is a completely self-contained 120/240 Volt power distribution
and energy management system intended to be used in recreational vehicles. It
is housed in a sheet metal enclosure with removable front panel. It provides cir-
cuit protection for all the 120 VAC loads in the motorhome and a system of
energy management to minimize the over-loading and tripping of circuit break-
ers.
Electrical Systems - House
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
WINDSOR
8•208
Circuit Breaker
ENERGY MANAGE-
MENT SYSTEM
50 AMP
(OPTIONAL)
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