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> Constant Wattage Heating tapes |
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What
are constant Constant Wattage Heating Cables
?
The characteristics
of Constant Wattage heating cables are designed
to give out a constant output in comparison
with
self regulating cables that adjust their
power output in response
to changes in the ambient temperature.
How do they work
?
The cables are constructed from a single resistance
wire element, connected between two insulated
bus-bar conductors which run the length of
the heating tape or cable. The resistance
wire is designed to make electrical contact
with the bus-bars at predetermined intervals,
eg. 1m. These connections are made at the
"NODE" points where the nickelchrome
resistance heating wire is either welded or
connected by rivets to the bus-bars forming
the parallel resistance conductors. As a result,
a sequence of electrically parallel heating
circuits are formed along the length of the
heating unit. Parallel resistance heaters
may be cut to any convenient length within
the limits imposed by the maximum heating
circuit length. |
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