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Posted By Topic: vynco V40MB1 single stud in meterboard.

rarrar
Aug 22 2019 13:55

so what's the point of this product having a single stud inside if the earth and nuetrals have to be on separate bars/studs?
additionally the board i am wanting to install has in it, one incoming nuetral with a meter nuetral crimped with it, one outgoing neutral, one incoming main earth, one earth cable to go to distribution board. that's two n and two e, why can't they go on the same single stud?
   

r0bbie
Aug 22 2019 14:02

I've only seen one but isn't it an internal meter box & made of plastic & doesn't need bonding so main earth to MSB?
   

r0bbie
Aug 22 2019 14:04

Sorry too many &'s in that sentence!
   

AlecK
Aug 22 2019 16:51

It's a meter panel.
It's non-conductive.
It is NOT a switchboard so it can't be origin of submains or final subcircuits.
so why would you need an earth?

WTF are you bringing a "main earth" into a meter box for? Main earthing conductors must run as directly as possible between MSB and electrode, NOT detouring all over the place.

I believe the stud provided is for terminating incoming and outgoing mains neutrals, plus meter shunt N.

The MEN must be at MSB, and you can't have PECs carrying load current so you can't put any earths onto the N stud


if you want to et up a combined meterbox / MSB, then use a panel that's designed for the dual function.


   

rarrar
Aug 22 2019 17:03

Simple, the board has been put in as the men point with the main switch located there, and the meter. therefore it needs a main earth and nuetral.
   

DougP
Aug 22 2019 17:10

It's not the right type of board to use for a main switchboard. That's why it doesn't have provision for the main earth bar and MEN link etc.

But if you're going to try, before it can be a main switchboard, it first must be a switchboard. Which means it must have protective devices for submains or final subcircuits as well as all the normal requirements for a main switchboard.
   

WillJ
Aug 22 2019 17:17

So you brought a Meter Board to use as a Main Switchboard and your complaining it doesn't have all the right parts!!! Of course is wont, just go and buy the right extra parts you need
   

Someone
Aug 22 2019 18:27

I have heard that it's because some meter installers want the neutral in, neutral out, and meter neutral crimped and bolted so they can be readily sealed.

Ours doesn't mind.
   

AlecK
Aug 23 2019 08:24

What MEPs & retailers don't want is for anyone to be able to disconnect the meter N .

So either a sealed connection, or one that can't be undone, is generally required.

Some used to secure their Ns by connecting mains Ns directly to the meter, but ESRs make that set-up "mains work (for good reasons) so it becomes high risk and needs to be inspected.

Just because there's a switch there doesn't mean it's the main switch, more likely just an isolating switch provided so that meters can be safely worked on without having to access supply fuse. This is increasingly common practice, as many metering contractors don't have authority to access network assets, yet "4836" says they can't work live

Info so far doesn't show that the MEN has to be in this enclosure, can remain a separate metering enclosure (which is not a switchboard); with MSB located elsewhere.
MEN has to be in MSB, as does origin of MEC.
In which case, no modification needed.

If wanting to have a combined meter enclosure & MSB, then wrong type of enclosure has been chosen.
   

rarrar
Aug 23 2019 08:56

the right type of enclosure has been chosen for meterboard and MSB, and it was livened yesterday, what annoyed me is it was sold to me as fit for purpose and came with a single stud. the only mod required was to add a stud and an MEN link. The meter nuetral was crimped in with the main neutral, what mystifies me is why the simple four cables, 2 n's and 2 e's can't go on one stud.
   

AlecK
Aug 23 2019 10:13

True that would make an effective connection between supply N & electrode - which is the primary function of an MEN link.

But (these days) the link has to be removable for testing purposes; without compromising either continuity of N to installation, or continuity of E from exposed conductive parts to mass of earth.
For example, testing polarity of supply.

Which is why we changed from connecting MEC (then called "earthing lead") to incoming N at MSB, to connecting it to E-bar and having a link.




   

nathan5
Aug 23 2019 13:56

I had a interesting chat with a inspector last year who told me that they prefer the MEN link in the meterbox as then they dont have to go inside at all.
I know it's not right but it is interesting the different opinions people have out there.
   

Sarmajor
Aug 24 2019 18:31

And again what the inspectors prefer is irrelevant.

The men link must be at the MSB and the majority of meter boxes fails to comply with the many different things that are required to be a main switchboard.


   

rarrar
Aug 24 2019 23:00

nathan5, who puts their meterboards outside these days? i thought those days were almost gone?

   

nathan5
Aug 25 2019 10:51

From driving around the area I have been working in at a rough guess I would say there is more external meterboxs than internal ones, all new housing.
I'm surprised how many are on the front of the house facing the road instead of being tucked around the corner out of site
   

SaintAlan
Aug 25 2019 13:02

External meter boxes are a PITA for most builders; all the penetrations, flashing, etc. The older method of installing it in a recess in the cladding, with a bead of silicon to seal the edge, caused water leaks and rot inside the walls so is no longer allowed by building inspectors. Putting the box somewhere inside like the garage is much better solution. Smart meters are wonderful!
   

Sarmajor
Aug 25 2019 14:50

Until something goes wrong and then the homeowner has to stay home to provide access for the metering technician to come and replace the meter or relay.

Outside is better and if done correctly there is no risk to the building.

Smart meters are a wonderful thing but they still have to be accessed from time to time for inspection/ audit purposes.

Different set or rules for electricity metering.

Metering is governed by the Electricity Industry Act 2010 which calls the Electricity Industry Participation Code 2010.

There is very little in the code about location of metering but there is plenty in their about access to metering equipment.

I can tell you from real world experience that retail customers do not like being inconvenienced and having to stay home to wait on a technician.
   

rarrar
Aug 25 2019 22:28

nathan5. that'll be because the people that are wiring are just robots and don't think that maybe they could save some coin and hassle by putting them inside simply.
sarmajor, the house i'm wiring has around 100 electrical fittings, not if any single one goes crook it has to be accessed from inside, how on earth is one meter going to be a drama? the times are a changing mate