electricalforum.nz

DougP

The outcomes for 4 mm2 min conductor parallel limitation comes from the IEC 60364. The outcome required is the distribution of the total current evenly between all cable cores in parallel so they must have the same impedance for this to occur. This means the conductor material, cross-sectional area...

DougP

This is one method I have found to search for old topics. Do a direct Google search on the old site by typing your search into Google like this: rondo site:www.electricalforum.co.nz search 1.jpg Right click on the result you want to find, and click "copy link address". The link address will look lik...

DougP

crocket Nov 20 2013 22:44 Is it always necessary to bond rondo batterns? Stainless benches connected via plastic pipes? dlink Nov 20 2013 22:54 why would you want to in the first place ???? no rule requiring it, and no touch potential. there is such a thing as too much earthing/bonding WireDr Nov 21...

DougP

Dannyboy May 18 2015 05:38 Recently my builder as started using steel rondo for ceiling battens on his house renovations. Do I need to bond? This questions may have been asked before but I was unable to find it. DougP May 18 2015 07:28 No you don\'t need to bond it. If you drill holes in it for cabl...

DougP

In other words, what outcomes are they looking to achieve?

DougP

Ok, I guess we could discuss the words for quite some time. To me, it doesn't seem to be the intention of the clause though.

So back in reality, what's the problem with paralleling two pairs smaller than 4mm² in a 4 core conductor?

DougP

Except that it does say "cables". Multiple times. And conductors, zero times.

And as you keep telling us, read the words that are written, and/or the words that aren't used are just as important.
(going off memory, not direct quotes)

1.4.17
1.4.19
1.4.31
?

DougP

Looking at "(a) cables shall be not less than 4mm2....." the way I read it 2.5mm2 would not be allowed to be paralleled up Except that the requirements of the clause should only apply, when the whole clause is applicable to the situation. So if the conductors being paralleled aren't included in the...

DougP

Can conductors within a multi core cable smaller than 4mm², be used in parallel? Such as a 2.5mm² 4c+e used with two sets of parallel conductors. 3.4.3 says "Current-carrying capacities for circuits comprising parallel multi-core cables or groups of single-core cables...." To me, that means parallel...

DougP

The methods are in 2.2.2

As Greg said, use the tables in appendix C

There's probably little difference if you miss a few fittings. Things like power points are counted in 20's anyway.

DougP

It was like a DIY guide for electricians. Had more practical information in it than 3000 does.
I don't have a copy though. One of the few I don't have

DougP

broadsword Sep 07 2019 14:11 [shim]Can anyone steer me to somewhere other than 3000: 2.5.7.2.3 (a) (iii) with respect to selection of MCBs to provide required discrimination please? for some reason i had in my head that a gap of one size was permitted... so a 32A submain could have a 20A mcb in the ...

DougP

Blownfuse Oct 15 2019 16:44 [shim]I have a 3 phase D type 40A MCB for a submain protection therefore it can have the 5 second rating applied, where can I find the 5 second earth fault loop impedance value for MCBs. AS/NZS 3000 only shows 0.4s EFLI values? DougP Oct 15 2019 17:03 [shim]You can calcul...

DougP

EnosM Oct 11 2019 15:20 Can an RCBO 1P+N be used in the switchboard of a caravan if the RCBO switches active and neutral? DougP Oct 11 2019 15:59 RCBO small.jpg Yes, and that's all you need. AlecK Oct 11 2019 17:03 as long as it's 16 A. EnosM Oct 11 2019 17:39 Thanks for your replies. I'm curious re...

DougP

north1 Oct 08 2019 20:50 [shim]Can any one advise where I can purchase a RCD Type B 20 amp RCD. Will be used for protection of single phase EV charging outlet. Tried JA Russell with no luck. WillJ Oct 08 2019 21:16 [shim]Try ABB, and speak to some at JAR that knows what they are talking about becaus...

DougP

mowgli Aug 21 2019 16:00 [shim]Is it true that an RCD that isn't required by the Standard, isn't required to switch the neutral? I've always assumed and tested for, perhaps wrongly, that all RCDs in NZ must switch the neutral. pluto Aug 21 2019 16:30 [shim]It is an ESR 2010 requirement reg 24(3)(a)....

DougP

mowgli Aug 12 2019 12:09 https://photos.app.goo.gl/i4RzQnv19qhDnEje9 https://photos.app.goo.gl/i4RzQnv19qhDnEje9 Consider the drawing and the snip from 3000. Does an iso switch and an MCB meet the definition of "isolating switches"? Would they provide for control of the installation? Is this really ...

DougP

1. Yes 63A is the usual size, but best to double check with your network if you want the absolute answer for your location. 2. The supply fuse is a requirement for fault protection (ESR 32). It doesn't have to provide overload protection, although the HRC fuses used generally do provide overload pro...

DougP

And if we can change "Main switchboards" to just Switchboards ?

DougP

3000 Section 3 title

Selection and Installation of Wiring Systems

DougP

Haydos123 Jan 16 2019 08:12 Client has an old freestanding range on 6mm and is wanting to change it to a built in hob and oven. In the past iv usually just run existing 6mm straight to the hob and looped to the oven but sometimes is quite hard to fit a couple of 6mm wires into the hob connection blo...

DougP

Mike Oct 31 2012 15:50 Hi there, customer wants a couple of power points and lights in her shed,can i run a 2.5mm tps protected by a 20a RCBO to power this without the need for a separate small subboard. The Don Oct 31 2012 16:59 Yes thats potentially possible , but would be checking installtion sit...

DougP

JamesMagnum Jan 15 2019 21:18 Just a thought I had while testing a new house the other day , when testing - why do we need to know the resistance value of a PEC in a sub circuit if you're getting acceptable Loop impedance test results? Does the loop test not prove an acceptable earth conductor resis...

DougP

aaron Jan 19 2019 18:55 Hi, I have a case that existing electrode rusted almost broken. The main earth wire still good, 0.41ohm continuity. I am wondering if it need an inspection for replacing electrode? BCee1 Jan 19 2019 19:35 No its a repair. No inspection required. sneath Jan 24 2019 15:49 In th...

DougP

Tommy Oct 17 2018 17:52 Hi I know a kitchen sink with plastic plumbing pipes doesnâ€™t have to be bonded what if the whole kitchen bench is stainless steel there are a couple of power points above bench and a hob in the bench Thanks for replies DougP Oct 17 2018 21:18 If the power points are mounted...

DougP

jerahmit Nov 26 2018 10:21 Hi there, I’m currently doing work on a apartment block and the retaliers have turned off 3 out of the 6 meters. They have asked for a COV. I’ve spoken with an inspector who has said that I can sign off the COV, I found the form in the EWRB website but it states on there i...

DougP

Tom93 Nov 22 2018 21:49 So I'm not yet registered as an electrician but not far off, I have been asked by a family friend if I can do an EWOF on their caravan and just wanting so information as to how and if I can go about it, I'm aware it would need to comply to 3000 and be tested to 3001, but is t...

DougP

QUESTION Regarding bonding / earthing of sinks; are insert sinks treated differently from sinks that have a drip tray or exposed metal work above the bench surface when it comes to earthing them? There seems to be a lot of agreement amongst trades people that a sink with a drip tray or flashing abov...

DougP

EricB Nov 24 2018 18:50 When calculating the potential maximum demand/load for a residential property we are allowed a certain diversity factor with different item/appliances. I am presently working on a residential property that will be using a Genset only for electrical supply. We are talking of a...

DougP

PaulT Dec 02 2018 20:27 I am wiring a kitchen alteration. There was a separate Oven and Hob each wired in 4mm TC+E with 20amp fuse for each. The home owner is now installing 2 x under-bench ovens (3.2 kW each) plus a Hob. Can I connect both ovens to the original double pole switch and upgrade protec...

DougP

adds133 Oct 11 2018 21:06 So under 2.6.3 there is no mention of needing RCDs out of residential installations apart from medical and schools etc. But under 2.6.3.4 additions states all sockets added must be protected by an rcd. How does this make sense when the commercial installation doesnt need th...

DougP

SymonS Oct 04 2018 06:58 After 40 years in this game I thought I could solve most problems, but this one has me beat. The scenario: A Motel unit having a kitchen refit. 2 double plugs on the bench unit. 1 four plate ceramic hob cooktop. The plug circuits are fed from an RCD on the sub board. The hob...

DougP

mowgli Oct 15 2018 07:47 Just looking at SDOCs here. Fully aware of appliance safety requirements. Trying to work out whether an SDOC is required for a small CNC machine. Basically it\'s a flexible cord set, appliance inlet and small power supply with ELV output to drive the machine. All LV componen...

DougP

Dufresne Oct 11 2018 18:24 Iâ€™ve been grappling with the application of AS/NZS 3010 to generator earthing in a situation where a permanently-connected, stand-alone generator supplies power to an installation. Clause 2.5 of AS/NZS 3010 says that â€œWhen the multiple earth neutral system (MEN) is to ...

DougP

OctaneOutlaw Oct 20 2018 10:47 Greetings I\'ve just been reading through section 8 of 3000 and 3017 to further my knowledge of these subjects \"The resistance of the main earthing conductor and any equipotential bonding conductor shall be not more than 0.5 â„¦. The resistance of protective earthing ...

DougP

DougP Sep 25 2018 13:17 I know this has been discussed many times.. But why does C2.5 seem to say that there is only 2 methods for determining the maximum demand of a final subcircuit? Now I have guys arguing that you can\'t have multiple powerpoints on 3x16A circuits, on a 40A MCB, because C2.5.1(b...

DougP

I've just started importing a few interesting topics from the old forum. I'll do some more as time permits and more topics are added by Greg.

This is the link for the Wayback Machine copy of the old forum.

http://web.archive.org/web/202001172134 ... php?page=1

DougP

OctaneOutlaw Oct 20 2018 10:47 Greetings I\'ve just been reading through section 8 of 3000 and 3017 to further my knowledge of these subjects \"The resistance of the main earthing conductor and any equipotential bonding conductor shall be not more than 0.5 â„¦. The resistance of protective earthing ...

DougP

As I think of them

Appliances - Connection & repair
Circuit sizing - current rating & voltage drop
Protective devices - Overcurrent, short circuit, RCD
Testing & verification
Transportable installations
Generators & solar

DougP

MT8262 Sep 30 2018 17:56 Have just looked at a job where a meter box is on the side of the garage, switchboard on the other side of garage with a main switch for garage sub-circuits and main switch for sub-mains to house. In the main switchboard at garage there is a neutral bar and earth bar but it ...

DougP

Not too sure about importing directly, it might have to be done manually one post at a time. I was looking through some of the old stuff yesterday, and there is certainly some (maybe 10%?) of posts that would be well worth bringing over. But firstly, is it possible to split the forum into subjects? ...

DougP

Thanks for putting in the effort to get this started Greg!

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