Search found 545 matches

by AlecK
Tue Sep 28, 2021 2:38 pm
Forum: Standards and Legislation
Topic: Proposed limits of work
Replies: 5
Views: 28

Re: Proposed limits of work

Good luck trying to co-ordinate anything in the few weeks available Q1 replacing a mains entry box is low risk; and within current LoW for EST But not within proposed LoW for EST, assuming the phrasing 'maintenance of work" has any real meaning. Which it doesn't, because you don't maintain "work"; y...
by AlecK
Sat Sep 25, 2021 10:26 am
Forum: Protective Devices
Topic: RCD Feeding RCD discrimination
Replies: 5
Views: 121

Re: RCD Feeding RCD discrimination

Type S are generally 100mA or more, and used mainly for property protection. Whereas RCDs for protection against shock can't be more than 30 mA. When NZ moves to allowing TT supply for some installations, we will need to deal with the lack of reliable discrimination between RCDs in series. Such inst...
by AlecK
Sat Sep 25, 2021 9:51 am
Forum: Standards and Legislation
Topic: Mains Work
Replies: 3
Views: 71

Re: Mains Work

The exact way the terms apply depends on which of 3 Exceptions to clause 5.3.5.1 is being used. Fig 5.2 illustrates all three, but does not indicate where the POS is (ie where the "installation" starts). It doesn't need to; because that's not relevant to understanding the requirements of the Standar...
by AlecK
Thu Sep 23, 2021 9:28 am
Forum: Selection and Installation of Wiring Systems
Topic: Overhead mains near trees
Replies: 5
Views: 58

Re: Overhead mains near trees

Correct a tree is not a structure While "3000" doesn't set specific required clearances from vegetation; it does require all external influences that can be reasonable expected to be considered when installing wiring systems, including "flora" (vegetation) [3.1.2 & 3.3.2.9]. Which means the installe...
by AlecK
Wed Sep 22, 2021 12:39 pm
Forum: Standards and Legislation
Topic: Mains Work
Replies: 3
Views: 71

Re: Mains Work

The problem is that ESRs don't allow for the fact that sometimes the MSB is not actually an MEN swbd, because the MEN link is relocated to the (dedicated) sub as permitted by 5.3.5.1 & illustrated in Fig 5.2. Therefore technically there may be no "mains" as defined in ESRs. However it would be most ...
by AlecK
Wed Sep 15, 2021 5:58 pm
Forum: Protective Devices
Topic: Fuses in parallel
Replies: 5
Views: 113

Re: Fuses in parallel

Would need the fuse link characteristics to work that out And not sure my brain would be up to it. HRCs are still basically thermal devices, but far different from a simple bit of tinned copper In fact my understanding is that each HRC link is, internally, a whole bunch of small, carefully-engineere...
by AlecK
Wed Sep 15, 2021 10:17 am
Forum: Protective Devices
Topic: Fuses in parallel
Replies: 5
Views: 113

Re: Fuses in parallel

Not my area of expertise either. And I don't like the idea much. However not significantly different from a dual-feed set-up with a bus-tie [Fig 7.1]. I think the suggested configuration will meet requirements for overload protection. Each bit of cable is protected by a suitable device, so cannot ca...
by AlecK
Thu Sep 09, 2021 10:00 am
Forum: Protective Devices
Topic: RCD Feeding RCD discrimination
Replies: 5
Views: 121

Re: RCD Feeding RCD discrimination

There is an underlying requirement to minimise inconvenience in the event of a fault [1.6.5 (a)] . Personally I don't like the use of "minimise"; because minimum means as low as it is possible to get - which would translate to only having one point per RCD. However a fundamental concept of "3000" is...
by AlecK
Fri Sep 03, 2021 9:27 am
Forum: General Electrical Discussions
Topic: Auto Transformer Neutral
Replies: 7
Views: 178

Re: Auto Transformer Neutral

Tho OP didn't state the nature of the equipment; other than it's from America. Therefore will be designed for operation on 60 Hz supply. auto transformer (any transformer) will provide 50Hz output; which may not be suitable. -------------- The need for neutral reference becomes clear if you forget a...
by AlecK
Wed Sep 01, 2021 1:48 pm
Forum: Generators and Solar
Topic: Where does mains parallel generation stop? Grid tied PV
Replies: 3
Views: 194

Re: Where does mains parallel generation stop? Grid tied PV

my interpretation is that the MPGS includes the inverter (except any 'standby' port), the output cable from the inverter to the installation, and any directly associated fittings such as overcurrent protection, RCDs, isolating switches, or metering.
by AlecK
Wed Sep 01, 2021 10:53 am
Forum: Generators and Solar
Topic: Where does mains parallel generation stop? Grid tied PV
Replies: 3
Views: 194

Re: Where does mains parallel generation stop? Grid tied PV

Definition of "mains parallel generation system" in ESR 4. Basically if any fittings can be supplied, at same time, from more than one source; and any of the sources is "generation... for that person's use" ; then it's mains parallel. Note that the term applies regardless of whether any of the sourc...
by AlecK
Wed Sep 01, 2021 10:28 am
Forum: General Electrical Discussions
Topic: Auto Transformer Neutral
Replies: 7
Views: 178

Re: Auto Transformer Neutral

The diagram is incorrect If you have 3 windings connected in star on a 3-phase 400 V supply; there can only be 230 V (approx) across each of them. The 400 V is between phases, not from each phase to earth. L-E voltage is 230 V. Therefore the line terminals should be labelled as 230 V, not 400 V Any ...
by AlecK
Tue Aug 31, 2021 9:10 am
Forum: Standards and Legislation
Topic: Standards - Cited vs Current
Replies: 2
Views: 113

Re: Standards - Cited vs Current

I would advise following latest available guidance; with 2 provisos. Firstly, do nothing that conflicts with a legal requirement. In this context, don't follow a later edition of it conflicts with the cited edition. That won't happen often, but we need to be careful. Secondly; if following the later...
by AlecK
Mon Aug 30, 2021 4:48 pm
Forum: General Electrical Discussions
Topic: Socket outlet on 1mm2, and other sins.
Replies: 15
Views: 1097

Re: Socket outlet on 1mm2, and other sins.

Not aware of any case law - unfortunately. And yes, you might get costs awarded against the Board if you win. On the other hand you might well not; unless you could show not just error but bad intent or improper practice or negligence. So chances are low. You'll also have noticed that there are gene...
by AlecK
Mon Aug 30, 2021 4:27 pm
Forum: Earthing and Bonding
Topic: 5.3.5.1 MEN location exceptions
Replies: 5
Views: 236

Re: 5.3.5.1 MEN location exceptions

A good question. As you've noted; the logic of TNC-S seems to require that once you've separated, from a PEN conductor (TNC) to separate N & PE conductors (TNS), you don't change back. However that logic has never? been reflected in NZ Regs / Wiring Rules. Certainly not since 1993. ---------------- ...
by AlecK
Mon Aug 30, 2021 1:20 pm
Forum: Selection and Installation of Wiring Systems
Topic: Support & fixing of cables 3.9.3.3
Replies: 9
Views: 1130

Re: Support & fixing of cables 3.9.3.3

Any confusion is caused by failure to read the words, and follow the directions; rather than by the words not being clear. As always, we need to read the entire clause; and not just home in on the bit we think we want. However that fact that some people have problems reading this bunch of clauses ha...
by AlecK
Mon Aug 30, 2021 12:14 pm
Forum: General Electrical Discussions
Topic: Socket outlet on 1mm2, and other sins.
Replies: 15
Views: 1097

Re: Socket outlet on 1mm2, and other sins.

The expert is usually, but not always, a holder of an Inspector PL. However as for Board members; while we would like to think they are chosen from the 'top end"; we can't really expect that since there are no published criteria for selection. In fact, no obvious basis for being considered to have a...
by AlecK
Sun Aug 29, 2021 10:18 am
Forum: Earthing and Bonding
Topic: 5.3.5.1 MEN location exceptions
Replies: 5
Views: 236

Re: 5.3.5.1 MEN location exceptions

Yes; it still meets the definition of "main switchboard" in ESR 4. However, because ESRs in several cases refer to "the MEN swbd closest to supply (or similar wording), this relocation of the MEN creates problems. EG definition of mains depends in part on them supplying an MEN swbd - but since the M...
by AlecK
Sun Aug 29, 2021 9:47 am
Forum: General Electrical Discussions
Topic: Socket outlet on 1mm2, and other sins.
Replies: 15
Views: 1097

Re: Socket outlet on 1mm2, and other sins.

They appear to rely heavily on the "experts" appointed to assist the Investigators ; but again there appears to be no process for checking that they actually are experts. Sometimes they are not even holders of Inspector PLs. Worth noting that while in this case such an expert prepared a report; they...
by AlecK
Sat Aug 28, 2021 5:34 pm
Forum: Testing & Verification
Topic: Procedural Document
Replies: 3
Views: 105

Re: Procedural Document

Given the variables; would be a big & complex thing
by AlecK
Sat Aug 28, 2021 12:14 pm
Forum: General Electrical Discussions
Topic: Socket outlet on 1mm2, and other sins.
Replies: 15
Views: 1097

Re: Socket outlet on 1mm2, and other sins.

Completely agree; there is absolutely NO requirement for an isolating switch. Or even for a functional switch.. But since the defendant accepted fault on that point, thus making the same error as the several Board members (who should all have known better), there appears to have been little if any d...
by AlecK
Tue Aug 24, 2021 3:25 pm
Forum: Generators and Solar
Topic: Solar Inverter RCD protection
Replies: 5
Views: 138

Re: Solar Inverter RCD protection

That's exactly what they're referring to. And I agree, an RCD does not really protect cable against mechanical damage However, "3000" does permit it as a means of such protection (in those circumstances listed in 3.9.4.2 or 3.9.4.3.2); despite the fact that it doesn't prevent damage from happening t...
by AlecK
Tue Aug 24, 2021 10:20 am
Forum: Generators and Solar
Topic: Solar Inverter RCD protection
Replies: 5
Views: 138

Re: Solar Inverter RCD protection

I do not believe that there is any actual conflict between these clauses.
by AlecK
Mon Aug 23, 2021 11:03 am
Forum: Forum User Guidelines
Topic: Marley Orannge ducting solvent
Replies: 4
Views: 405

Re: Marley Orannge ducting solvent

Can't provide a simple answer; but colour isn't the way to tell what to use; what matters will be the type of plastic. The safety data sheets at: https://www.marley.co.nz/technical-docs/safety-data-sheets/ show that the "gold" & "clear" are different mixes of same chemicals ; so presumably intended ...
by AlecK
Mon Aug 23, 2021 10:27 am
Forum: Standards and Legislation
Topic: AS/NZS 3000:2007 4.10 (Heating Cables) + NZS6110
Replies: 3
Views: 139

Re: AS/NZS 3000:2007 4.10 (Heating Cables) + NZS6110

4.10 "electric heating cables for floors and ceilings and trace heating applications." Includes all types of heating cables for all applications (hard to think of anything that wouldn't fit). So whether you call in "in floor", "under-floor", "under-tile" or whatever doesn't matter; it's still a heat...
by AlecK
Thu Aug 19, 2021 3:11 pm
Forum: Standards and Legislation
Topic: Manufacturers Instructions - New installations
Replies: 2
Views: 128

Re: Manufacturers Instructions - New installations

Short answer: No. But I think you're confusing two different requirements. True they both relate to RCDs; but they're about different RCDs installed for different purposes. In 2005 edition; 5.3.4 requires that an inverter must be connected to the installation upstream (on the grid side) of any RCDs ...
by AlecK
Tue Aug 17, 2021 9:39 am
Forum: Standards and Legislation
Topic: Is a main switch actually part of mains work?
Replies: 4
Views: 153

Re: Is a main switch actually part of mains work?

WRT inspection of earth electrodes: "mains work" includes work on the "main earthing system"; which includes the earth electrode. Therefore ESR 70 (3)(a) requires the inspector to be "satisfied" that the work of installing the electrode has been done in accordance with ESRs. So the compliance of the...
by AlecK
Tue Aug 17, 2021 9:08 am
Forum: Standards and Legislation
Topic: Is a main switch actually part of mains work?
Replies: 4
Views: 153

Re: Is a main switch actually part of mains work?

WRT main switches: The definition of "mains work" includes work on "mains"; and that definition is "fittings forming part of an installation that are used for the supply of electricity to the MEN switchboard that is closest to the point of supply. "fittings" includes conductors but is not limited to...
by AlecK
Mon Aug 16, 2021 11:51 am
Forum: Appliances
Topic: Used appliances - how to cover yourself?
Replies: 3
Views: 159

Re: Used appliances - how to cover yourself?

Scope of "5761" is not restricted to plug-in only. However it is restricted to "household & similar" appliances. 2.4.1(e) lists "fitted with a plug conforming to AS/NZS 3112" as one of the steps to be undertaken "prior to sale". This is unclear; because it's not a complete sentence. It seems to say ...
by AlecK
Mon Aug 16, 2021 9:10 am
Forum: Earthing and Bonding
Topic: 5.3.5.1 MEN location exceptions
Replies: 5
Views: 236

Re: 5.3.5.1 MEN location exceptions

Fig 5.2 illustrates the configuration when the MEN is located i.a.w these Exceptions. Note that the MEC still has one end connected to installation main earth bar. The other end is connected to the substation earth bar; to which the electrode is also connected. Basically the whole "main earthing sys...
by AlecK
Mon Aug 16, 2021 8:50 am
Forum: Appliances
Topic: Used appliances - how to cover yourself?
Replies: 3
Views: 159

Re: Used appliances - how to cover yourself?

ESR 80(3) provides a pathway to "deemed safe" for used appliances.
True it's tagged "for purposes of this regulation"; so technically can be relied on for sale / supply; but not necessarily for simply installing.
But it's the best you'll find.
by AlecK
Mon Aug 16, 2021 8:41 am
Forum: Protective Devices
Topic: Oven replacement - RCD protection of socket outlet?
Replies: 3
Views: 173

Re: Oven replacement - RCD protection of socket outlet?

You're replacing a fitting (a cooking appliance) with a similar fitting. Therefore you're maintaining the installation; working under ESR 59(3), with 3 options available - one of them being maintaining in original condition. What some people call "like for like"; although that term doesn't appear an...
by AlecK
Sun Aug 15, 2021 12:03 pm
Forum: Transportable Installations
Topic: Does rcds rule of 3000 apply?
Replies: 8
Views: 269

Re: Does rcds rule of 3000 apply?

Correct; For a WoEF, only those matters covered in Part 1 or in AppC are relevant.
So the precise arrangement of any RCD protection that's present isn't a WoEF matter.
by AlecK
Sat Aug 14, 2021 11:13 am
Forum: Transportable Installations
Topic: Does rcds rule of 3000 apply?
Replies: 8
Views: 269

Re: Does rcds rule of 3000 apply?

Not that they can't apply. Just that in practice they seldom do; because caravans / motorhomes generally only have one subcircuit. Other types of connectable installation (eg mobile shop / kitchen) may have more than one subcircuit, but are non-domestic. If a caravan / motorhome ever did have more t...
by AlecK
Fri Aug 13, 2021 12:43 pm
Forum: Distribution, Networks & Metering
Topic: Outbuilding definition
Replies: 3
Views: 245

Re: Outbuilding definition

For purposes of '3000"; ESR 4 (2) specifies that a term used in a Standard has the meaning used in that Standard, unless either the Act or ESRs provide a different definition. There's no definition of 'outbuilding" in either the Electricity act or ESRs; so the word takes the meaning used in '3000". ...
by AlecK
Fri Aug 13, 2021 9:19 am
Forum: Transportable Installations
Topic: Does rcds rule of 3000 apply?
Replies: 8
Views: 269

Re: Does rcds rule of 3000 apply?

Yes, clause 2.6.2.4 applies; because nothing in "3001" modifies any part of it. So you have to apply (a); and distribute lighting over more than one subcircuit - IF there is more than one subcircuit As you've note, (b) - the 3 subcircuit rule - only applies to "residential installations". In 2018 ed...
by AlecK
Thu Aug 12, 2021 9:52 am
Forum: Transportable Installations
Topic: Does rcds rule of 3000 apply?
Replies: 8
Views: 269

Re: Does rcds rule of 3000 apply?

As per clause 1.2, rules of "3000" apply unless specifically modified by "3001".
Which particular RCD rule are you thinking of?
by AlecK
Tue Aug 10, 2021 5:21 pm
Forum: Standards and Legislation
Topic: How long do we have to issue a CoC?
Replies: 10
Views: 278

Re: How long do we have to issue a CoC?

I think it was actually deliberate. No need to put a time limit because officially all that matters is that the CoC gets issued before connection happens. And they don't care who issues it; as long as someone accepts responsibility. For larger contract-type jobs it's better this way, we wouldn't wan...
by AlecK
Tue Aug 10, 2021 12:35 pm
Forum: Selection and Installation of Wiring Systems
Topic: Shipping Container
Replies: 3
Views: 125

Re: Shipping Container

Imported to NZ by:
https://digitalimports.co.nz
by AlecK
Tue Aug 10, 2021 9:08 am
Forum: Selection and Installation of Wiring Systems
Topic: Shipping Container
Replies: 3
Views: 125

Re: Shipping Container

Whether you need to apply "3001" depends on whether the unit is to be plugged in ( transportable), or hard-wired as part (or all) of a fixed installation. If it's to be plugged in, then it must comply with Part 2 of "3000, as modified by "3001". Assuming it's a steel container, rather than an insula...
by AlecK
Mon Aug 09, 2021 3:51 pm
Forum: Standards and Legislation
Topic: How long do we have to issue a CoC?
Replies: 10
Views: 278

Re: How long do we have to issue a CoC?

You can only be taken to task for doing, or not doing, something you have a duty to do / not do. If someone issues a CoC (or RoI, ir ESC), then they are responsible for validity of all the info it contains. For RoIs & ESCs there's a duty imposed on a particular individual to issue. But there's no su...
by AlecK
Mon Aug 09, 2021 10:36 am
Forum: Standards and Legislation
Topic: How long do we have to issue a CoC?
Replies: 10
Views: 278

Re: How long do we have to issue a CoC?

Noting that EWRB recently "convicted" someone for failing-to certify.
Seems they - and their lawyers - have also failed to notice that there is no requirement placed on any person to issue a CoC
by AlecK
Mon Aug 09, 2021 10:33 am
Forum: Standards and Legislation
Topic: How long do we have to issue a CoC?
Replies: 10
Views: 278

Re: How long do we have to issue a CoC?

No.
The offence would be connecting without sighting a CoC (and RoI if req'd).
Which is something that networks do all the time - and get away with 'cos nobody complains.
by AlecK
Mon Aug 09, 2021 10:25 am
Forum: Damp Situations
Topic: Shower with screen, zone 2
Replies: 3
Views: 179

Re: Shower with screen, zone 2

Correct WRT title of 6.8, my error. For barrier height, it's clear that a (qualifying) barrier limits Z1 even above the top of the barrier. Which is logical because shower water generally sprays down rather than up And I believe that, since the Figs are intended to illustrate the rules of the clause...
by AlecK
Mon Aug 09, 2021 9:18 am
Forum: Standards and Legislation
Topic: How long do we have to issue a CoC?
Replies: 10
Views: 278

Re: How long do we have to issue a CoC?

Yes, it certainly is PEW And being installation work, is at least general PEW; so a CoC is definitely required by ESR 65. Where work is incomplete, or where it was only intended as provision-for-later; whatever was done should be certified, but with care: - the description of work needs to be carefu...
by AlecK
Sun Aug 08, 2021 12:30 pm
Forum: Protective Devices
Topic: Oven replacement - RCD protection of socket outlet?
Replies: 3
Views: 173

Re: Oven replacement - RCD protection of socket outlet?

Just a flaw; and - as you've noticed - corrected in 2018 edition.

On the other hand, that Exception was only ever intended for larger appliance, particularly ranges, due to the poor seals on older MIMS elements.
There's no good reason to avoid RCD for an oven.
by AlecK
Sun Aug 08, 2021 12:25 pm
Forum: Standards and Legislation
Topic: How long do we have to issue a CoC?
Replies: 10
Views: 278

Re: How long do we have to issue a CoC?

Correct that work isn't completed until certified. and that once a CoC is issued; 74E then starts a timer for provision of copies. But there is no time limit for issue. And there's also nothing that makes it anyone's responsibility to issue; or even to ensure that a CoC is issued at all. What drives...
by AlecK
Fri Aug 06, 2021 12:15 pm
Forum: Damp Situations
Topic: Shower with screen, zone 2
Replies: 3
Views: 179

Re: Shower with screen, zone 2

While most people rely on the Figs; what really matters is the words in the relevant clause. Especially the words that point to the Fig. Some Figs do introduce requirements that aren't in a clause, but this is regarded as poor practice when writing a Standard. The default position is that Figs illus...
by AlecK
Fri Aug 06, 2021 9:21 am
Forum: Switchboards
Topic: Restricted Locations - 2.9.2.5 (c)
Replies: 2
Views: 177

Re: Restricted Locations - 2.9.2.5 (c)

For terms used in a standard, ESR 4(2) governs definitions. However neither "room" nor "cupboard" is defined in Act, or Regulations, or "3000"; or IEC60050. That means normal dictionary definitions should apply; buit as you suggest this could be open to interpretation. In my view, with more than 600...
by AlecK
Mon Aug 02, 2021 9:23 am
Forum: Appliances
Topic: Motor Overload - 4.13.2
Replies: 2
Views: 132

Re: Motor Overload - 4.13.2

Doesn't say "individual" or "dedicated" or "separate" means of protection;
or any other wording that would require the protection for one motor to be only for that motor.

Not unheard of for several motors of a system to share common control / protection devices,
but needs care to get it right