Plumbing Parts Identification: Supports - Commercial 

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Galvanic corrosion occurs when there are 2 dissimilar metals touching while an electrolyte is present. In the case of Copper touching Unistrut - the only time you’re going to see corrosion is if there is condensation present. Low or minimal condensation environments will see near minimal corrosion over the lifespan of the pipe / support. In high condensation environments you can combat this by either insulating the pipe, or as the video shows - create a barrier between the 2 dissimilar metals. Just a note to add that it’s not always necessary to create that barrier just because it’s 2 dissimilar metals touching - the key factor is the electrolyte AKA water (which is a weak electrolyte)