- #71
Tom.G
Science Advisor
Gold Member
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Yes, that would be the case; you could get twice the expected voltage line-to-line if the SPDs were rated at the line-to-line voltage and were connected line-to-ground. Also, your earlier posts seemed to indicate that the 240V 3-phase was not referenced to ground (which I found rather strange at the time and was cleared up in your post #61.) Since in reality you have 120V 2-phase, 120V SPD on each line would work. There are also 120v/240v SPDs for exactly that situation. But that would exceed the 300V limitation on the power supply input voltage. The only way to address the 300V limitation is to supply 120V to the power supply.kiki_danc said:the MCOV voltage would add up becoming 320V+320V=640 V (and clamping voltage would further increase).
Because that was not the question you asked. You asked in post #63 "computer is connected to Phase A and Phase B and the SPD is intended for Phase A and Ground."kiki_danc said:But why haven't you considered this?
As a side comment, I am not at all surprised that your attempt to return the already installed SPDs was rejected. The vendor has no way of knowing or testing if the have been damaged by a surge. Would you willingly buy a used protective device at full price knowing that it is in unknown condition? At least here in the USA, electrical and electronic components that have been installed are not returnable, for not only that reason but the vendor could be liable for any subsequent damage.
Cheers,
Tom