oscar21
Nearly Esteemed
Do I need any more than this to fit the above board, does it need a fitting kit for the switch or anything extra to get it up and running (tails excluded obviously)
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Discuss Wylex 3 phase board fitting. in the UK Electrical Forum area at ElectriciansForums.net
That makes sense thanks, must have been what JW was getting at ut I couldn't remember it.You have to remember that the SPD is trying to divert the surge current. So if the supply goes above 500V-ish it starts to conduct rapidly and in order to dump a few kA of surge, and at for no more than a kV or so of let-through voltage, it has to have a dynamic impedance (dV/dI) of under an ohm.
But that all happens very quickly (tens of microseconds), so if the SPD's cable has any significant inductance that make the SPD look like a higher impedance, so you get less current diverted and so a bigger voltage let-through.
The SPD and its cable is a shunt across the supply, so the length of supply cable feeding it is not important, it is the length of cable between the supply L/N/E and the SPD terminals that determines how well it is able to shunt that current away (heating up internally in the process).
I have not come across many scenarios when i can omit surge protection . If Anything is going to be more expensive to repaire that the cost of the surge unit. Then I fit one. For example high level light would expensive to repaire if scissor lift was required.Got loads of Wylex metal blanks, I presume they will fit in. As for surge, I'm going to fit a 3rd party one in an external enclosure, the price of the wylex one is ridiculous. Thats if it needs a SPD at all, not too sure of the commercial regulations.
Never use metal blanks on a vertical mounted installation as I learned the hard way few months back doing a strip out on a old bupa building everything labeled up incorrectly (as I know know )removing the db cover to cheak it was isolated and one of them metal blanks slid down and landed directly across two phases sore eyes and alot of metal splashGot loads of Wylex metal blanks, I presume they will fit in. As for surge, I'm going to fit a 3rd party one in an external enclosure, the price of the wylex one is ridiculous. Thats if it needs a SPD at all, not too sure of the commercial regulations.
They are an improvement for sure, a bit like the Axiom ones oddly enough.As for the metal blanks, the ones that you have to put in at an angle that slide about all over the place are the worst blanks I've ever tried to fit, however Wylex have come up with a new design of metal blank that clip in like the older plastic blanks did and you can fit them after the lid is on, they grip the lid really tightly as well so no chance of them falling out or sliding about.
Reply to Wylex 3 phase board fitting. in the UK Electrical Forum area at ElectriciansForums.net