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In Part 2, we began looking at requirements for neon installations that operate over 1kV. All conductors for these systems must be [600.32(B)]:
Compare that to the conductor requirements for systems 1kV or less [600.31(B)]:
The next requirement we find in 600.32 is to install the conductors so they aren’t subject to physical damage. This requirement also appears in many other Articles. But it really does not need to be stated, because:
The NEC doesn’t define “subject to physical damage,” but we know it when we see it. You need to ensure that the wiring method can withstand the conditions of use [Annex D, Example D3(a)]. We already make temperature adjustments. Adjusting for possible physical damage is just another step you must take.
For example, there’s a driveway between the sign and the power source. To protect the conductors, you might trench under the driveway.