Heatworks MODEL 1 Manual Del Usuario página 14

Electrical subpanels containing circuit breakers may be
used with appliances such as the MODEL 1 Water Heater
in residential and commercial applications.
In new, and in some existing residential construction,
there is generally enough breaker spaces in the main
electrical panel to accommodate several additional
circuit breakers for the MODEL 1 Water Heater. However,
in some existing homes, the main electrical panel may
be nearly full with circuit breakers serving existing
loads. In these cases, one or more subpanels, each with
a single large breaker rated for the entire load of the
water heater, can be installed off of the main panel. The
boxes for a 50 or 60 A subpanel can be purchased for
about $15 each, and the breaker for about $12. Smaller
boxes and breakers are slightly less expensive.
BRANCH CIRCUITS AND BREAKERS:
As a non-continuous heating appliance, the branch
circuit wires and breakers must be sized to at least 100%
of the maximum ampere rating of the appliance. This is
particularly important to avoid overheating of the wires
at the connections to the breakers. Overheating at the
breaker connections may cause nuisance or premature
breaker trips. It is recommended that the wire for the
branch circuits and subfeeds be rated for at least 75° C.
If you use THHN, which is rated for 90° C, the wire gauge
is smaller than standard 75° C wire, and the nylon
covering makes it much easier to pull. It also costs about
the same.
12
All manuals and user guides at all-guides.com
CAUTION: Breaker must remain off until installation is complete.
Current Draw Wire Gauge
(A) (75° C)
15 14
20 12
30 10
40 8
50 6
Wire Gauge
(90° C – THHN)
14
12
10
8
8