Search found 242 matches
- Wed Sep 01, 2021 9:28 pm
- Forum: General Electrical Discussions
- Topic: Auto Transformer Neutral
- Replies: 8
- Views: 8923
Re: Auto Transformer Neutral
@AlecK Maybe thinking about it this way? 400V phase to phase for primary. 230V phase to phase for secondary 115V phase to neutral secondary Yes, the fault protection needs to be correct. But for the unbalanced secondary load, it will be 115V load which was unbalanced, and having a secondary neutral ...
- Mon Aug 30, 2021 1:22 pm
- Forum: General Electrical Discussions
- Topic: Socket outlet on 1mm2, and other sins.
- Replies: 15
- Views: 14069
Re: Socket outlet on 1mm2, and other sins.
If I was wrongly disciplined through an error or misinterpretation of the rules on their part, I would certainly be appealing the decision. I know a couple of people who would probably love to be expert witnesses ;) Also I would hope that all costs would be awarded if successful. Does anyone know of...
- Mon Aug 30, 2021 10:56 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Support & fixing of cables 3.9.3.3
- Replies: 9
- Views: 5751
Re: Support & fixing of cables 3.9.3.3
Just looking through the new requirements for "likely to be disturbed" in 3000:2018A2. 3.9.3.3.1 & .2 specify certain locations, but excludes the use of RCDs and points to 3.3.2.6 for mechanical protection. Without a more detailed explanation of areas that are "likely to be disturbed", anywhere in a...
- Sun Aug 29, 2021 11:29 pm
- Forum: General Electrical Discussions
- Topic: Socket outlet on 1mm2, and other sins.
- Replies: 15
- Views: 14069
Re: Socket outlet on 1mm2, and other sins.
Worth noting that while in this case such an expert prepared a report; they have not published it. In this case, the expert assisting the investigator was an inspector. And somehow managed to complete a report as a basis for the charges, without visiting the site. The investigator must have taken a...
- Sun Aug 29, 2021 9:52 pm
- Forum: General Electrical Discussions
- Topic: Auto Transformer Neutral
- Replies: 8
- Views: 8923
Re: Auto Transformer Neutral
Yes, like this. But that doesn't mean that the input side needs to have a neutral connected. As long as any unbalanced loads (single phase loads) on the output have a neutral connected, the output voltage will still be balanced.
- Sat Aug 28, 2021 3:38 pm
- Forum: Testing & Verification
- Topic: Procedural Document
- Replies: 4
- Views: 5993
- Sat Aug 28, 2021 1:34 pm
- Forum: General Electrical Discussions
- Topic: Socket outlet on 1mm2, and other sins.
- Replies: 15
- Views: 14069
Re: Socket outlet on 1mm2, and other sins.
That's pretty much what I thought as well.
- Sat Aug 28, 2021 11:19 am
- Forum: General Electrical Discussions
- Topic: Socket outlet on 1mm2, and other sins.
- Replies: 15
- Views: 14069
Re: Socket outlet on 1mm2, and other sins.
Following up with further board decisions. A question came up recently regarding a light fitting having a switch installed in the installation wiring. So for example, if a fitting has a built in switch, is an additional switch required. Similarly, I have done sensor light circuits on rental properti...
- Tue Aug 17, 2021 7:54 am
- Forum: Standards and Legislation
- Topic: Is a main switch actually part of mains work?
- Replies: 4
- Views: 2340
Re: Is a main switch actually part of mains work?
Along the same lines for inspection of mains work - if an installation is using a strip-type earth electrode which in NZ is required to be 7.5m long an buried at 0.5m or more. Is this something that inspectors should be inspecting? With a driven electrode, you can reasonably assume that it is the co...
- Tue Aug 10, 2021 8:52 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Shipping Container
- Replies: 3
- Views: 2085
Re: Shipping Container
If it's going to be plug in, then it's 3001 for the container wiring and the supply to the socket outlet it's connected to. If you hard wire it, then it's not. If it was me, I would weld simple brackets inside to fix conduit onto (or possibly cable tray). The same as is done in steel/aluminium boats.
- Mon Aug 09, 2021 10:47 am
- Forum: Standards and Legislation
- Topic: How long do we have to issue a CoC?
- Replies: 14
- Views: 8304
Re: How long do we have to issue a CoC?
But in a simple case of someone running a cable for a socket outlet, they must sight the COC before they connect it.
There is a requirement that the COC is issued before connection right?
So that's the offence.
There is a requirement that the COC is issued before connection right?
So that's the offence.
- Mon Aug 09, 2021 9:25 am
- Forum: Standards and Legislation
- Topic: How long do we have to issue a CoC?
- Replies: 14
- Views: 8304
Re: How long do we have to issue a CoC?
Except that ESR73A(1)(c) requires the COC to be issued before the installation or part installation is connected to a supply.
So issuing the COC any time after the work is connected (other than for testing), must be an offence under 73B right?
So issuing the COC any time after the work is connected (other than for testing), must be an offence under 73B right?
- Fri Aug 06, 2021 8:24 am
- Forum: Damp Situations
- Topic: Shower with screen, zone 2
- Replies: 8
- Views: 9334
Shower with screen, zone 2
3000:2007A2 Figure 6.7 doesn't match fig 6.8, fig 6.9, or the wording of 6.2.2.1 I know AlecK has explained the string method of determining the zones, but that doesn't prevent zone2 still existing on the other side of a 1.8m screen/barrier because zone 2 is 2.25m high. This doesn't seem to have cha...
- Mon Jul 12, 2021 10:33 am
- Forum: Protective Devices
- Topic: Minimum of two RCDs when more than one FSC 2.6.2.4 (b) (ii)
- Replies: 3
- Views: 5528
Re: Minimum of two RCDs when more than one FSC 2.6.2.4 (b) (ii)
So for example, if there was a sub board with 2 FSCs, you're asking if there should be 2 RCDs? Because there might already be one or more RCDs on the MSB... I'm not even sure that the note explains it in a helpful way. If there was 2 FCSs, 1 for socket outlets and 1 for lights, having 2 RCDs isn't g...
- Sat Jun 26, 2021 5:03 pm
- Forum: Generators and Solar
- Topic: Single phase generator on a 3 phase installation
- Replies: 6
- Views: 8843
Re: Single phase generator on a 3 phase installation
Thanks for your comments AlecK I thought I saw something about a review of 3010. Is that still open for comments? There's quite a few questions in other forums about generator supplies. This 3ph supply and single phase changeover switch question is a common one, and also generator supplies connected...
- Sat Jun 26, 2021 2:18 pm
- Forum: Generators and Solar
- Topic: Single phase generator on a 3 phase installation
- Replies: 6
- Views: 8843
Re: Single phase generator on a 3 phase installation
Sorry Alec, I think I have to disagree. 7.3.8.1.2 seems very specific. "The changeover device shall open all active conductors of the normal supply when the alternative supply is connected." You usually say to look at the words that aren't written, as well as what is written. And in 3010 2.7.2(b) Ac...
- Sat Jun 26, 2021 8:08 am
- Forum: Generators and Solar
- Topic: Single phase generator on a 3 phase installation
- Replies: 6
- Views: 8843
Single phase generator on a 3 phase installation
For example, wiring a single phase generator inlet to a 3 phase installation. --- Can a single phase changeover switch (two pole changeover) installed after the 3ph main switch, be used on only one phase to supply that phase from the generator? I'm saying no, because section 7 of 3000 and 3010 both ...
- Thu Jun 17, 2021 7:44 am
- Forum: Distribution, Networks & Metering
- Topic: Meter Terminal size
- Replies: 5
- Views: 6646
Re: Meter Terminal size
Size the mains to suit the load, distance and installation conditions as usual. If the cable needs to be smaller for the meter, then just reduce it in the metering enclosure/switchboard. You would need to check your local network rules or retailer rules to get the exact determination. I'm pretty sur...
- Sun Jun 13, 2021 10:24 pm
- Forum: Switchboards
- Topic: Switchboard access changes due to AS/NZS 3000-2018 Amendment 2
- Replies: 4
- Views: 17128
Re: Switchboard access changes due to AS/NZS 3000-2018 Amendment 2
Sounds interesting. AlecK is probably all over this
- Sun Jun 13, 2021 8:59 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Overload Protection
- Replies: 5
- Views: 3250
Re: Overload Protection
Around the 60's and 70's, it was common to wire like that when only two outlets were allowed per circuit on a rewirable fuse. When anyone has added to an (old) existing circuit like this in the past, the rewirable fuse should have replaced with a circuit breaker (to allow more than 2 outlets), but o...
- Thu Jun 10, 2021 6:52 pm
- Forum: Testing & Verification
- Topic: 115V P-e, N-e, 240V P-N
- Replies: 7
- Views: 8509
Re: 115V P-e, N-e, 240V P-N
You need to confirm an earth is connected before you can do a live loop test. Which is why there is a specific order of carrying out tests in section 8.
Do the trailing lead Re test first. Then also an IR test would be useful, but the results might be confusing if you don't know how to interpret them.
Do the trailing lead Re test first. Then also an IR test would be useful, but the results might be confusing if you don't know how to interpret them.
- Thu Jun 10, 2021 8:01 am
- Forum: Testing & Verification
- Topic: 115V P-e, N-e, 240V P-N
- Replies: 7
- Views: 8509
Re: 115V P-e, N-e, 240V P-N
Sorry I missed that it was only one outlet. So that circuit probably doesn't have the earth connected correctly. You need to test the earth at the outlet with a trailing lead and a low-ohm meter (not a multimeter).
- Wed Jun 09, 2021 8:39 pm
- Forum: Testing & Verification
- Topic: 115V P-e, N-e, 240V P-N
- Replies: 7
- Views: 8509
Re: 115V P-e, N-e, 240V P-N
I would be checking if it has a MEN link.
- Wed May 12, 2021 8:24 am
- Forum: Transportable Installations
- Topic: Shore power connector & inlet
- Replies: 12
- Views: 7058
Re: Shore power connector & inlet
Oh, and yes, the polarity layout is backwards on US outlets (earth, neutral and "hot" - clockwise), but they consider 240V outlets are two "hot" connections (being usually part of a split phase 180deg domestic connection), so they don't really have a polarity AFAIK. Usually I find it easier not to t...
- Wed May 12, 2021 8:15 am
- Forum: Transportable Installations
- Topic: Shore power connector & inlet
- Replies: 12
- Views: 7058
Re: Shore power connector & inlet
The Nema L6 series is for 230/240V
They aren't interchangeable with L5
https://diy.stackexchange.com/questions ... connect-to
They aren't interchangeable with L5
https://diy.stackexchange.com/questions ... connect-to
- Mon Apr 12, 2021 8:58 am
- Forum: Testing & Verification
- Topic: Electronic recording of test results, COCs and ESCs
- Replies: 5
- Views: 6589
Re: Electronic recording of test results, COCs and ESCs
The editable PDFs are what I use. The only issue is that if you send that PDF to a client, it is still editable - so any details could be changed. The way I am getting around that, is to print it to another PDF document, which then isn't editable. Maybe there's a way to lock or password protect the ...
- Sun Apr 11, 2021 9:38 am
- Forum: Switchboards
- Topic: Meterbox as BTS
- Replies: 4
- Views: 5527
Re: Meterbox as BTS
This is what I picked as the important parts that make it a main switchboard, rather than just a meter box. (NOTE: these clause numbers are from 3000:2018 because I made the list for an Australian group - but the same requirements are in 3000:2007) -------------------- Firstly, it must actually be a...
- Sun Apr 11, 2021 9:34 am
- Forum: Earthing and Bonding
- Topic: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
- Replies: 6
- Views: 6540
Re: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
the first paragraph in 5.6.2.6.4 isn't written clearly. ".. for the bonding connection to be made to the conductive parts of the pool structure" Sounds like the connection point should be on the conductive parts of the pool structure. I don't think that was the intention. The rewritten clause in 300...
- Sun Apr 11, 2021 9:27 am
- Forum: Damp Situations
- Topic: power points under eves
- Replies: 6
- Views: 8621
Re: power points under eves
3000:2018 has a 30deg angle zone under an overhang, where no IP rating is required. Cleaning/waterblasting isn't taken into consideration.
3000:2018A1 4.1.3 & Fig 4.1
3000:2018A1 4.1.3 & Fig 4.1
- Sat Apr 10, 2021 9:01 am
- Forum: Earthing and Bonding
- Topic: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
- Replies: 6
- Views: 6540
Re: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
It can just be an enclosure with an earth bar. Mounting it near the pool equipment power point(s). There is a dedicated enclosure available (in Aust at least). But because the connection to the reinforcing doesn't need to be accessible, I wouldn't bother using anything like this. https://www.conduct...
- Wed Mar 17, 2021 9:18 pm
- Forum: Inspection
- Topic: using 6mm as mains tails in a domestic DB
- Replies: 5
- Views: 7439
Re: using 6mm as mains tails in a domestic DB
The current ratings for conductors in switchboards is unenclosed in air. Normal PVC cable ratings are 3008 table 4.
So the rating of 6mm² would be 58A @ 75deg.
Almost all conductors these days are V90, so exceeding the 75deg rating is possible, and that would take the rating up to 67A.
So the rating of 6mm² would be 58A @ 75deg.
Almost all conductors these days are V90, so exceeding the 75deg rating is possible, and that would take the rating up to 67A.
- Mon Mar 15, 2021 3:46 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Are crimp links fittings
- Replies: 10
- Views: 4615
Re: Are crimp links fittings
Everyone knows how to terminate a junction box don't they?
- Fri Feb 26, 2021 12:21 pm
- Forum: Earthing and Bonding
- Topic: Pool Equipment Bonding 5.6.2.6.1 (b)
- Replies: 6
- Views: 7011
Re: Pool Equipment Bonding 5.6.2.6.1 (b)
Have a look at 5.6.3.2(b) exception. The bonding conductor can just be the earth in the supply cable to the pump or other equipment.
- Fri Feb 26, 2021 8:44 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Overhead Submain Cabling
- Replies: 17
- Views: 8004
Re: Overhead Submain Cabling
3.12.1 specifies the allowable types of conductors. They don't have to be hard drawn. The first item on table 3.9 is annealed copper conductors.
- Mon Feb 22, 2021 8:00 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Overhead Submain Cabling
- Replies: 17
- Views: 8004
Re: Overhead Submain Cabling
There seems to be some confusion between aerials and catenary?
- Fri Feb 19, 2021 9:24 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Overhead Submain Cabling
- Replies: 17
- Views: 8004
Re: Overhead Submain Cabling
I was under the impression that cable manufacturers recommended that their cables were protected from UV. But on re-reading their information, I see that they mean the insulation of the single cores, and that the sheath provides the UV protection. I've noticed that lines companies are also sleeving ...
- Fri Feb 05, 2021 7:47 pm
- Forum: Testing & Verification
- Topic: CoV for 6mo+ Re-livening
- Replies: 2
- Views: 4963
- Fri Feb 05, 2021 7:33 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Overhead Submain Cabling
- Replies: 17
- Views: 8004
Re: Overhead Submain Cabling
You should be able to find 6mm2 twin NS cable? I have used it before, although it might have been the underground variety. The other option is to use TPS in a conduit on a catenary (4.13), or build a solid structure between the buildings if they are close. If you build a structure, then the minimum ...
- Fri Jan 29, 2021 9:06 pm
- Forum: Earthing and Bonding
- Topic: Nominal size
- Replies: 5
- Views: 4442
- Fri Jan 29, 2021 7:18 am
- Forum: Earthing and Bonding
- Topic: Nominal size
- Replies: 5
- Views: 4442
Re: Nominal size
IMO, according to the wording of "the largest active conductor of the consumers mains", you should go for the earth rated for the size of the 120mm² Al. The 50mm² Cu, only has a suitable CCC for that service because it's rated as spaced within a switchboard. It's not big enough for the whole mains r...
- Wed Jan 27, 2021 10:11 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Heat pump , max demand calc
- Replies: 6
- Views: 3843
Re: Heat pump , max demand calc
Starting current or overload current (locked rotor, over pressure etc) , isn't usually allowed for in installation wiring. Such as the note in 3.6.2 for example. But also the wiring and protective devices have to work in the real world. So for example (without getting into the technicalities of soft...
- Fri Jan 22, 2021 11:10 pm
- Forum: Testing & Verification
- Topic: Testing after switchboard upgrade
- Replies: 3
- Views: 5911
Re: Testing after switchboard upgrade
An appliance that isn't faulty being plugged in shouldn't give you a failed reading, because you only test from each of A & N to earth. So presumably you were checking between A & N? That isn't a required test. It's probably debatable how much testing should be done when replacing a switchboard, but...
- Thu Jan 21, 2021 1:18 pm
- Forum: Appliances
- Topic: Large induction hobs
- Replies: 3
- Views: 4004
Re: Large induction hobs
That's my thoughts as well.
But some in the trade think that everything in the MIs override 3000.
But some in the trade think that everything in the MIs override 3000.
- Thu Jan 21, 2021 7:42 am
- Forum: Appliances
- Topic: Large induction hobs
- Replies: 3
- Views: 4004
Large induction hobs
Under 3000:2018, which presumably NZ will eventually cite, sections 2, 3 & 4 of the book has a new paragraph at the beginning. --- Installed in accordance with the requirements of this Section, and the additional requirements as specified in the manufacturer’s instructions. --- If an induction hob h...
- Fri Dec 25, 2020 8:46 am
- Forum: Earthing and Bonding
- Topic: While you're waiting for your Christmas roast to cook..
- Replies: 4
- Views: 4157
While you're waiting for your Christmas roast to cook..
Merry Christmas everyone!
Here's a brain teaser for you...
PEN submain to a switchboard in a pool shed?
Yes or No?
Here's a brain teaser for you...
PEN submain to a switchboard in a pool shed?
Yes or No?
- Sun Dec 20, 2020 10:44 am
- Forum: Inspection
- Topic: Inspection after livening
- Replies: 11
- Views: 9831
Re: Inspection after livening
How do you plan on inspecting the installation of the mains? Do you have a spade in the truck?
- Mon Nov 30, 2020 6:21 pm
- Forum: Switchboards
- Topic: Switchboards and additional enclosures
- Replies: 5
- Views: 6312
Re: Switchboards and additional enclosures
If the actives of the supply to the second enclosure, comes directly from line side actives in the first enclosure, then the supply to the second enclosure is not a submain. 1.4.89 - submains. (in part) .... "...at the load terminals of the circuit protective devices provided within or on a switchbo...
- Mon Nov 23, 2020 10:03 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Support & fixing of cables 3.9.3.3
- Replies: 9
- Views: 5751
Re: Support & fixing of cables 3.9.3.3
3.3.2.6 in the 2018 version is the same as the 2007 version apart from the title of the clause.
The asterix is because the name of the clause changed from "impact" to "mechanical damage.
Appendix H was already in the 2017 version.
The asterix is because the name of the clause changed from "impact" to "mechanical damage.
Appendix H was already in the 2017 version.
- Sun Nov 15, 2020 6:58 pm
- Forum: Inspection
- Topic: WoEF
- Replies: 6
- Views: 6052
Re: WoEF
No. Why do you ask?
- Wed Nov 11, 2020 8:41 am
- Forum: Earthing and Bonding
- Topic: Cable tray
- Replies: 5
- Views: 4536
Re: Cable tray
for double insulated conductors no, but for good practice yes, the photo is a good example That's not going to help the guy on the forklift if he gets off it when the forklift is live though. The cables were only damaged on the forklift side, not the back. And any electrical worker getting up there...