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)
Discuss Wylex 3 phase board fitting. in the UK Electrical Forum area at ElectriciansForums.net
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.Are you using every way if not you will need done blanking modules and check if you need surge protection
It is, almost certainly it will fall under 443.4.1 section (iii) "significant financial or data loss" if something business-critical stops working as a result.Thats if it needs a SPD at all, not too sure of the commercial regulations.
Keep it basic, to suit the question.
The newerclip in Wylex blanks are a big improvement on the others, they grip the sides quite firmly now. As you say the older type used to slide about all over the place, it was hard enough even trying to get a horizontal cover on with them in never mind a vertical one. I will look into the proper blanks for that unit though.Use the correct blanks those metal consumer unit blanks will just slide down when fitting or fall out when someone removes the cover which could be dangerous.
The problem with this job is its 2 buildings into one, I think I posted a thread on it a while ago. Its one building with one entrance door but it has two of everything including incoming supplies/meters. The customer wanted it wiring this way so there are two mains units, one for the left half and one for the right half. I take it it would need an SPD on both units, I'm not even sure where the 2nd supplies comes from, its not looped from the other supply and looks newer than the original one.It is, almost certainly it will fall under 443.4.1 section (iii) "significant financial or data loss" if something business-critical stops working as a result.
Having said that, for £160 or so I can't imagine you will save that much once you add up the cost of parts and your time to do a 3rd party DIN box compared to the internal kit:
From TLC:Wylex NHTNSP125L 125A 10kA Integral Surge Arrester Kit
Buy Wylex NHTNSP125L 125A 10kA Integral Surge Arrester Kit from Falcon Electrical UK a leading electrical wholesalerwww.falconelectrical.co.uk
Yes, you are looking at separate SPD for each half.The customer wanted it wiring this way so there are two mains units, one for the left half and one for the right half. I take it it would need an SPD on both units, I'm not even sure where the 2nd supplies comes from, its not looped from the other supply and looks newer than the original one.
What I like about the MCB-like blanks is they help you get the correct MCB spacing while screwing the busbar point if you have combinations that leave gaps (e.g. TP then (1-2)*SP then TP in a set of 3, etc).I will look into the proper blanks for that unit though.
Never used to be such major problems...Just no fuse wire or cartridge in the carrier....What I like about the MCB-like blanks is they help you get the correct MCB spacing while screwing the busbar point if you have combinations that leave gaps (e.g. TP then (1-2)*SP then TP in a set of 3, etc).
You just need to check that one end is correctly lined up with the cover's hole to begin with, and later the cover ought to fit nicely and any future addition can be done without having to move any about.
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.What does this achieve, to me its like putting your solar panels on the roof to be closer to the sun thats 93 million miles away.
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
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