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JamieP

You can, but what's the point? You're correct you will have no discrimination so it'll be luck of the draw what trips and what doesn't so you'll be putting yourself in a situation where enough leakage fault on either is just as likely to take out both as it is to take out the one with the leakage In...

JamieP

Just so I'm understanding correctly, you're saying essentially it starts at the inverter and including the inverter but not any of the backup supplies (as they don't supply parallel with anything else) etcetc Just trying to understand the final statement, so all the parts up to connection are "suppl...

JamieP

PEW regarding mains parallel generation systems and PV installations are high risk 5033 clearly states that the PV part is "This Standard sets out general installation and safety requirements for photovoltaic (PV) arrays, including d.c. array wiring, electrical protection devices, switching and eart...

JamieP

Just a further point in regards to this I believe most PCEs these days are transformerless which as discussed above makes the views of this not being PEW less and less of a logical argument, there is no physical separation in the PCE between input and output which even moreso feels like the ELV side...

JamieP

I'm just curious on opinions on the best advice to give others around this Many of our cited versions are sometimes 1 or even 2 versions behind, in some cases there probably isn't significant issues, in others maybe there is Cited versions are law, and obviously we must meet the requirements of thes...

JamieP

Understood, thank you Alec Further question, can we supply a separate MEN installation in an outbuilding from a non-linked subboard? I always thought this was ok but does that conflict with the TN-C-S way of thinking going back to a combined PEN after they have already been split? For example, mains...

JamieP

How does one even become an "expert" or even assist in these investigations?

JamieP

Just for confirmation

The the switchboard the MEN has moved from is still the main switchboard, it just becomes a main switchboard without a MEN connection inside and still meets all other requirements?

JamieP

Sorry mate, I don't under what you're asking

JamieP

I saw a question the other day that I didn't know the answer too and that was "are ring circuits legal in NZ"? Now I don't know much about ring circuits, other than being big in UK and can have higher overcurrent protection levels and that also UK has fuses in there plug tops (feel like there was so...

JamieP

You are correct, it's common over in Australia in those scenarios

But my question was in regards to 5.3.4 of 4777.1 2005 and the meaning behind this clause, whether it was permitted to have RCD protection on the supply to the inverter

JamieP

Alec, I know you probably don't want to explain yourself twice but would you mind going a little more in depth into your reasoning, incase the response elsewhere isn't seen

Or shall I copy and paste the original here?

JamieP

I recently made a post elsewhere that touched on this but thought this deserved a dedicated thread 4777.1:2016 allows such an arrangement and is common is Australia Screenshot_20210824-095339_Google PDF Viewer.jpg But although looking to a more up to date standard is a good idea, you have to make su...

JamieP

Just normally the Marley PVC clear solvent, green label, I'd never known it to be suitable for one colour of conduit and not another

JamieP

I'd say best to contact the manufacturers of the ducting and the solvent, they'll be able to inform you straight away what there products are suitable for

JamieP

I'd definitely class under tile heating as under floor heating In regards to 4.10.5, I can't speak for your particular situation but all the ones I've done have had a braided screen under the outer insulation, they are normally flexible from what I've dealt with Because NZS6110 is cited in 3000 and ...

JamieP

Have a read of 3.9.4.2 Basically if cables are installed within 50mm within a wall, floor, ceiling or roof they need protection in accordance with 3.9.4.4 unless you meet the exception in 3.9.4.2 that it can be within 50mm and not need protection if able to move freely out of the 50mm zone on chance...

JamieP

5.3.4 in 2005 is worded so confusingly, I see what you're saying though The way it says "grid side of ANY RCD" and the way the notes backed that logic up with the fact they indicate "An RCD is not to be placed between the consumers mains and the solar supply (see Clause 5.3.4)" still makes me feel l...

JamieP

ESR 59 (3) allows us to use MIs to maintain or replace as an alternative to following 3000 ESR 59 (2) only allows compliance with part 1 or 2 of 3000 ESR 14A allows us to rely on them as being electrically safe in certain situations outlined in (a) and (b) But can we use MIs as an alternative of com...

JamieP

Very interesting read on both accounts, thanks Alec

JamieP

Just been looking at definitions in ESRs and although a lot of people talk about main switches as they are part of mains work it's actually just the connection of mains to them that is mains work? Correct? Just curious in regards to inspection of mains work if things such as main switch height or lo...

JamieP

Yeah, also thought that was the best path also despite the "when sold or offered for sale"

I went on to look at 5761 but 2.4.1 talked a lot about plugs but I wasn't sure if this meant it had to have one or simply if it had one it had to conform etcetc

JamieP

In regards to used appliances, when a customer asks for a 2nd hand or similar appliance to be installed, what must or can we do to ensure the appliances is electrically safe, more so when the appliance isn't connected via or doesn't come with a plug on it? I've had a look through ESRs (mainly 26, 80...

JamieP

Under this clause there are exceptions for the MEN to not need be located on the main switchboard If using such exception, it doesn't mention any change of location for the MEC or other parts of the earthing system Would you still do everything else as normal in such a situation? Doesn't seem right ...

JamieP

If the main switchboard is on the concrete plinth then all the outgoing feeds are submains

5.5.3.1 (b)(I) prevents there being more than one MEN link in the outbuilding

Outbuilding is definited by 1.4.69, I believe it meets this definition

Doesn't sound compliant to me

JamieP

This has stemmed from a conversation in regards to someone who had run cables, essentially prewiring a job but has left such job for whatever reason There is large argument between whether, simply running cables, requires a CoC, my thoughts, due to ESR65 and Schedule 1 are that this is PEW and will ...

JamieP

I've been asked to replace a wall oven with another The current oven is directly wired, the customer has asked if possible to add a socket outlet and flexible plug on the new one, no issues with this, 15A socket and plug I'm well aware of 2.6.3.1 Exception 3 but because this is an alteration to an e...

JamieP

ESR74E "(2) The responsible person must, within 20 days after completing the work, pro- vide a copy of the certificate of compliance" But that only applies once work is completed Looking at ESR65 (3) and (4) work isn't completely until a CoC is issued, so until a CoC is issued then work isn't comple...

JamieP

Thanks Alec, appreciate the confirmation

JamieP

"Each electric motor having a rating exceeding 370 W shall be provided with
control equipment incorporating means of protection against overload of the
motor."

Does each need its own motor overload protection? Or can you use a single motor overload for multiple items?

JamieP

Thank you, this is exactly what I thought If there's one thing I've learned from you (there's heaps actually haha) it's that the words matter, if they wanted it to apply to any cooking appliance, they would have just said cooking appliance, the fact that they used electric cooking appliance was what...

JamieP

"This requirement need not apply to a socket-outlet or a connecting device specifically for the connection of a fixed or stationary electric cooking appliance, such as a range, oven or hotplate unit, provided that" Do we still consider a gas appliance as an electric cooking appliance due to it still...

JamieP

Thank you both, clears it up for me and it makes perfect sense when you explain the background to it

JamieP

What are peoples views in regards to this? Does this apply as a minimum of 2 per switchboard? As in, 2 FSCs in a subboard require 2 RCDs? Or is this total taken as across the whole installation and provided there was already at least 1 on the MSB that the subboard could infact have 1 covering the mi...

JamieP

I was wondering if MIs could be used in situations like this in accordance with ESR14A and obviously following all instructions because of as you said, standards don't always keep up with technology but it seems nothing in ESR59 and 61 allows for the use as such as an alternative to 3000 and if to p...

JamieP

When you say outside the scope of the wiring rules is that due to the fact you wouldn't consider it installation wiring?

JamieP

Just curious around what rules to apply for screens, such as those in screened instruments cables or other similar arrangements when the screen is there for preventing interference Would such be considered FEs? (Functional earths) They are not used for any protective purposes The main things I'm cur...

JamieP

Thanks Alec, appreciated as always

JamieP

I get what you're saying but I was reading it as 4.5 covers "Isolation Devices" in general, which it does but when the system is a PV system, that the requirements to follow are are specifically in 5033

JamieP

"Where the energy source is a PV array, the isolation switches and isolation arrangements shall comply with the requirements of AS/NZS 5033." So you'd just follow what 5033 says in regards to this, problem is the cited version of 5033 which is the 2012 is more directed at string systems than micro s...

JamieP

That's exactly what I thought, just the way you worded the part I highlighted made me feel you were implying that they did infact need to be done in a similar way to the PEN example

Thank you

JamieP

else the submain must be looped in & out; and all terminations done in such manner that continuity of A,N & E to DB2 cannot be broken by disconnecting any connections within DB1. I thought this was only a case for PEN conductors when submains used the outbuilding earthing clause, I can't find anyth...

JamieP

Purely because that's what I'm being instructed to use

No other reason aside from that, my preference is to simply use green/yellow the whole way

JamieP

Further question in regards to this, I haven't seen green/yellow sleeving but green is very common It's also the prefered method for insulating N/S when used as an earth screen I don't believe this to be compliant but I have noticed 3.8.3.1 (b) says that the screen doesn't need to be indentified the...

JamieP

Just curious of peoples views around parallel conductors and earths Seems to very much be directed at CCC and live conductors but the rules don't seem to exempt earths in any way My question stems from an example of 6mm² 2c+e, would it be compliant to parallel 2 cables, the live conductors meet the ...

JamieP

I think it's the fact that that exception only allows single insulation "provided that such cables are not exposed to touch during normal switching or meter-reading operations"

JamieP

I absolutely love bootlaces and think they are a tidy and effective way to make terminations, I've used them a lot in switchboards on your standard stranded TPS (5 strand, 7 strand etc) Someone informed me the other day that this shouldn't be done I'm just curious if anyone has any information or do...

JamieP

I have an existing submain coming from a MSB to a DB What I have been asked to do is to extend this submain to another board, so having the 2, supplied via the one submain, which I can't see any issue at all But my issue is rather than continue the submain from the line side of the DB, they have ask...

JamieP

Is it sand or friable soil? Is it free from sharp stone?

If yes, then it's compliant

If not, then it's not

I'm not super familiar with the products but just had a look at what I could online and they do look like they probably meet the definition of sand or friable soil

JamieP

Thanks team, I was just always under the impression there was more too it but interesting to know

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