electricalforum.nz

AlecK

As for your other query; look at the relevant clause rather than just the Table. Cat C is defined in both 3.11.2 (para 5) and 3.11.3.3. Any type of wiring system that's installed chased in rock and covered in concrete meets the definition; however, as per 3.11.2 para 6, the cable type must be one of...

AlecK

Short answer: yes. Correct that, for all listed types of cable; if installed in MD conduit and encased on concrete the wiring system is classified as Cat A (column 3 of the Table). Without the concrete, whether it's Cat A or Cat B depends on cable type (column 7). I think you've perhaps missed the c...

AlecK

ESR 113 is useful for more than just fittings that were installed under older rules and are remaining in service. It covers old stock, and re-cycled fittings as well. Any item that's covered by Clause (1); can not only continue in service ("continue to be ...used") under Clause (2); but they can con...

AlecK

All Notes to clauses are intended to provide additional information (as explained in the Foreword). They do not set requirements. This one relates to the reason that we don't use 'normal' Type A RCDs for EV supplies; which is that with a rectifying load such as an EV charger there are very likely to...

AlecK

Assuming you'll be using colour of conductor insulation as the means of achieving (mandatory) conductor ID; then the colours of Table 3.4 are mandatory. So the default position is that cables with plain green insulation on the PEC do not comply with the requirement for PECs to be bi-coloured G/Y. 3....

AlecK

For stranded cables, crimp joins are perfectly acceptable under those clauses. Ordinary sleeving provides conductor insulation; and and heavy-duty shrink sleeving provides an adequate re-instatement of sheath. However most 1 mm2 TPS in NZ is single-stranded, and that doesn't take crimp joints well. ...

AlecK

When it comes to mobile plant; there is a degree of overlap between two parallel pathways to safety compliance. An item of equipment can be treated as transportable equipment, and ongoing safety managed via ESR 26; or it can be managed as a connectable installation, under ESRs 60 and 76 - 78. Depend...

AlecK

Agree using difference-in-loop-impedance as described would give a usable figure for VD in mains; based on MD by limitation at rating of supply fuse. Could do similar for any submains (A-N, rather than A-E as for EFLI). By using the overcurrent device ratings as the MD, will be on the safe side - an...

AlecK

You are correct that ownership has nothing to do with application of Wiring rules. And being on same Title has very little if anything. What matters, for purposes of 2.9.2.3(b), is occupancy. Bear in mind that - due to ESR 4(2) - some of the relevant definitions have to be from Act / ESRs instead of...

AlecK

RCDs need to be in a single body in order to function correctly. They are always multi-pole devices, due to the need to have all live conductors of the circuit passing through the sensing toroid. They are not assembled by linking several separate single-pole devices; as for overcurrent devices. So i...

AlecK

There is NO( requirement to link mcbs on 3-phase circuits. It's perfectly OK to use individual overcurrent protection devices (fuses or mcbs). However the devices for each circuit must be grouped / labelled to show the association between them [2.9.5.2]. The only case where linking is mandated is fo...

AlecK

yes the appendix is specifically for caravan parks, but it provides a basis for assessing in other situations that is likely to be closer to reality than treating this point as just a socket outlet.

AlecK

That paragraph applies for a single motor being isolated by the switch. The following para provides the calculation for switch rating if there are multiple motors isolated by the same switch. Yes under locked-rotor conditions you would expect the motor's overload protection (as against the circuit o...

AlecK

I agree; CoC is required for all installation of conductors that counts as PEW. In defining installation of conductors as PEW; Schedule 1 does not restrict it in any way (eg to only current-carrying conductors). Risk category is not so clear. ESR 60(1)(b) requires electrical (part-) installation "in...

AlecK

app A of 3001 provides guidance.
But if you allow the full 16 A you can't be wrong

AlecK

RCBO for external supply can be upstream of source selection device. 2nd RCD to cover supply from inverter can be either upstream of source selection device, or downstream. Upstream is better. Either way you'll have RCD protection in place regardless which source is selected. However when it comes t...

AlecK

Given that up to 1993 ALL installation work was subject to inspection; I believe we can safely assume that the location & accessibilty of switchboards was accepted by the (then ) Electrical Supply Authority as being compliant with requirements of the time. Of course the building structure may have c...

AlecK

I believe "assume balanced", as published, is the correct the wording. By taking the current of the heaviest-load phase, and doing the (3-phase) volt-drop calculation on the basis that the other 2 phases also have that same loading (ie balanced); we are being conservative. It's not a worst-case scen...

AlecK

I agree T&T done correctly can be expensive ; and that some offering such services don't do a proper job. Also that requiring a particular Standard to be used, when that Standard clearly states that it isn't intended for that purpose; is inappropriate. Certainly demonstrates a lack of detailed under...

AlecK

The point isn't which - if any - tag you use. The point is to inspect and test in an appropriate manner in order to provide the PCBU with some assurance that the appliances are safe for use. There just doesn't happen to be a specific Standard for that. But the tests as per 3760 remain appropriate, a...

AlecK

I suspect these are clothes dryer; not hair dryers. If so, then covered by the Exclusion in clause 1.1.6. However that doesn't mean you can't provide the service wanted. As a PCBU, the camp manager has a duty under HSWA to take all practicable steps That includes ensuring that electrical equipment i...

AlecK

I've never heard of a main switch being called anything else but 'main switch'; except where there is more than one level of control. Eg where lighting & power were separately metered; there would be a "main switch' for each, and a "master switch" upstream of them They have been "main switch(es)" al...

AlecK

Short answer: yes; we must have 0.6 m access space in front of a domestic swbd. (If the swbd is in a cupboard, we only need it when the cupboard door is open) Clause 2.9.2.2 covers both access & emergency exit requirements. The only Exception is clearly stated to apply only to "doors of switchrooms"...

AlecK

ESRs 22 - 26 are about safety of fittings; under Part 2 "General Safety Requirements". (so are ESRs 80 - 87, under Part 6, safety of fittings & appliances) ESR 63 is about safety of work done on an installation (how the fittings have been installed) . (so's ESR 13 - Past 2 again) ESR 20 is about the...

AlecK

How could anyone believe that 63(1)(b) calls for more testing, in addition to what is required by ESR 60? As far as installing a (new) RCD is concerned; we are entitled to rely on the SDoC [ ESR 83] as establishing that the fitting is electrically safe. The point of the testing in Section 8 (as call...

AlecK

Well done

AlecK

It's entirely possible to use a contactor as you suggest; but it makes complying with some of the other requirements more complex. For example; the supply to contactor coil is effectively a subcircuit (or part of one), because it supplies a load. Therefore it must have RCD protection. You also have ...

AlecK

Short answer: using a black as active is generally non-compliant (for wiring systems using colour of conductor insulation as the means of ID) Clause 3.8 is complex, and needs to be read carefully. However the basic rule is that conductor function must be "clearly" identified. Where that ID is by col...

AlecK

Both the work done, and certification of it, must be to the cited edition(s) of Standard(s). The Electricity Industry Participation Code is at a lower level than Regulations. Acts are promulgated by Parliament. Regulations are promulgated by Government (by Order in Council); in the case of ESRs unde...

AlecK

Nothing to say the OP is DYI. Could just be an electrician with limited experience of wiring a house. maybe spent his career to date mostly on large building sites, or industrial work. The answer is to gain practical experience; generally by changing employment. Job management is not something you c...

AlecK

Further, Note 2 explains that a common switch can be used for several appliance in same room. (In 2018 edition, this is upgraded from Note to paragraph of clause) This might stretch the 2m guideline. But given that open cooking surfaces tend to be high-power appliances, and therefore unlikely to be ...

AlecK

Agree that inference can be taken from the wording.
But certainly not clearly stated, and remote operation not clearly prohibited.

AlecK

Correct; the switch required by 4.7.1 is not an isolating switch, so 2.3.2.2 is not applicable. True the wording suggests that the switching has to be "visible" and "readily accessible"; But very pedantic to argue that this prohibits using a remote contactor together with a visible / accessible oper...

AlecK

The claim that a RoI somehow becomes invalid if the CoC for the work inspected in incomplete or inaccurate is not supported by any of the wording in ESRs. So in my view it's simply an incorrect interpretation. If that's how they want the system to work; then they should be changing the ESRs to clear...

AlecK

Both Worksafe & EWRB have an expectation that Inspectors should check the accuracy & completeness of CoCs for the High Risk PEW we inspect. And if it comes to a hearing before the Board, that's the basis they'll work on. However there's absolutely no basis for this in the ESRs. So if they ever went ...

AlecK

The work you do must comply and it must not reduce the safety of anything there before. So if, for example, you find that an underground duct has insufficient cover over the existing cables, you can't add any new cables through that duct. The existing cables may have complied when installed, but the...

AlecK

According to Schedule 1, PEW includes installation / connection / maintenance of (1)(a) conductors; and (1)(b) fittings connected to conductors, or intended to be connected. At first glance; a conduit / duct / trunking / tray isn't either. And where the duct is just a duct; that seems OK to me. Anyo...

AlecK

Yes, I'm still active on EL 001. And with Covid having prevented any face-to-face meetings for over 2 years now, the whole process has become slower. WRT 4.7.3 & Fig 4-17 (the 'new' zone around an open cooking surface in 2018 edition, so not yet enforceable in NZ); same general rule applies: follow ...

AlecK

Good point; I got that last statement wrong. Apologies "String" measurement applies; even though not currently referred to as such. And if I had been thinking in terms of string measurement, instead of looking at the (incorrect) box-shape for Z2 shown in the Fig; I wouldn't have made this error. Mai...

AlecK

Important to remember that these Figs do not set the requirements; they only illustrate what's set in the relevant clause. They're there to assist with understanding the rules; and we have to apply the words of the clause and not just take the Fig by itself. That's usually - but not always - the cas...

AlecK

Two completely different functions. Installing meters is a matter for energy traders; mainly through Metering Equipment Providers, who may either use own staff or subcontractors. Whatever the exact mix, and regardless of area; metering is a function of who the consumer buys their energy from. Connec...

AlecK

If being treated as a "connectable installation"; must have a current WoEF before being connected to supply [ESR 76]. And that connection is by plugging in ("detachable connection"), not by direct connection Just being designed to be transportable isn't enough by itself. Not only does ESR 60 require...

AlecK

Correct that "5139" has not yet been directly cited in ESRs. It's also not cited as mandatory by currently cited edition of "3000" (refer clause 7.8 for a bunch of such "secondary citations") It is cited in 2018 edition (from Amendment 1). Therefore it's status is guidance. While that means you can'...

AlecK

Correct a washing machine is not a 'fixed water container" and creates no damp situation zones.

AlecK

Anything that gets directly connected becomes part of the installation it's connected to. So yes an ESC is required, each time they get connected. And yes, the person connecting is responsible for them being "safe to connect " [ESR 73A] Also true that a CoC that is less than 6 months old can be reli...

AlecK

Correct that the key for ESCs is not "livening" but simply "connecting"; and ESR 74A was specifically changed to make clear that this includes making connections on Works [ clause (1AA) (c) refers]. Leaving the fuse out makes NO difference, the active is still 'connected' for purposes of ESR 74A. An...

AlecK

The authority of any Standard comes from where, and how, it is cited by another document. The Standard may have a rule saying "shall" but that's only legally enforceable is the Standard - or the particular rule - is cited as mandatory in a regulation. "5601.1" provides guidance on gas installations....

AlecK

The Exception is about volt drop overall, not limited to just volt drop within the mains. So it doesn't matter how the overall volt drop is distributed between mains, submains, and / or final subcircuits; the only question is: has the mains size been increased; beyond that required to carry max dema...

AlecK

"3760" specifies the min IR for a Class I appliance as 1 megohm

AlecK

That's your choice. Personally even for a single load I'd be following 4.5 and setting up an installation MSB. I assume you intend using one option of 4.4 (standalone power system directly feeding a single load). Your genset either has an earthed neutral output [4.4.2 & Fig 4.1 (a)]; or it provides ...

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