Depending upon the amount of flexwatt in your run, simple lamp wire may not be safe. Lamp wire and thin gauge extension cords are rated for 15 amps.
You need to calculate the correct amperage that you will need, and you should always exceed the amperage rating by at least 30%. Now in most racks it will be ok, but you should always do the math just in case. Here's the math:
Calculate the total watt draw of the flexwatt. Multiply the total length in feet, by the watt rating per foot (8, 10, 20).
Then use the total watts in the equation of Watt's law to get the amperage
w = total watts
v = voltage
a = amps
w / v = a
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