electricalforum.nz

AlecK

Yes; but why bother?
simpler just to apply G/Y heat shrink along the length.
A better result, and faster therefore cheaper- even if the heat shrink costs a bit more than non-shrink sleeving.

Personally I haven't used old-fashioned non-shrink sleeving for many years.

AlecK

Not true Galvanic isolation by transformer is not in any way dependent of whether the case, or the inter-winding protective shield (if fitted), are connected to shore earth or boat's earth. The only thing that matters for galvanic isolation is that there are no connections between the 2 earthing sys...

AlecK

I believe it fits the description for "light fitting" on the Gazetted list of DMRAs.
Therefore SDoC required.

AlecK

The concept that circuits are either "lighting" or "power" is long-established - and entirely false. A circuit is a circuit. It has to have big enough conductors to supply the expected load. It has to have absolute overcurrent protection. It has to have fault protection. Etc. Some of these requireme...

AlecK

Yes the Standard's Scope covers personal devices. But that's not the point; what matters here is the scope of work requested by the client; which as Greg suggests is Unlikely to include guest's personal equipment in a hotel setting. That said, I am aware of at least one rest home that requires resid...

AlecK

As far as Wiring Rules are concerned; yes. As far as Building Code; Clause G9 is satisfied by compliance with Wiring rules (as certified by an ESC). I assume the particular requirement you've quoted is from your local network's requirements (network connection standard or similar). The details may v...

AlecK

First-up; the location of MSB isn't really part of an Inspector's functions under ESR 70. How the mains wiring is installed is, also the main earthing system; but location of switchboards and internal wiring of switchboards isn't; because it's not "mains work" so not classed as high risk PEW. But th...

AlecK

currently "3012" is not cited as mandatory [ESR 25]. I am not aware of any suggestion that this will change when the citation in Schedule 2 changes to the newer edition. That makes the entire document advisory. App J is stated to be "normative"; and the effect of this is that it has the same status ...

AlecK

Of course it's OK to have more than 1 phase in an enclosure - how else would 3-phase equipment work?. I suspect what's meant is 2 different circuits present; and again the answer is "yes". The follow-up question is whether para 4 of Clause 2.3.2.1 requires a "notice" simply for presence of more than...

AlecK

I can't see anything fits the description either.
"5139" certainly isn't there

AlecK

Yes. The essential points are - multi-stranded conductors to cope with flexing / vibration during transport - current limitation to protect the incoming supply lead & associated fittings - RCD protection for all final subcircuits. There's currently no specific requirement for a single means of isola...

AlecK

Seems odd that anyone would have a supply that size that's simply a stand-by. But can't see anything obviously non-compliant about it. I'm assuming you didn't design this, and are simply installing it. In that case you probably have a plan to follow; issued by the designer. That plan is likely to qu...

AlecK

Anything under Part 1 requires a certified design; and 1.9.4 means this CD will be very clear about exactly which bits are Part 1. If you've got all that documentation; then ESRs allow you to follow the CD in good faith; and the CD will also be what the inspector inspects to. If you haven't got all ...

AlecK

"appliance" is a term that causes a lot of problems with interpretation. Largely because for our trade it's a defined term with a particular meaning; whereas the same word in common usage means something different, generally but not exclusively something that is plugged in. The definition in the Act...

AlecK

- connecting to (network owned) supply fuse - installing, resealing meters These actions are not inspection of high risk PEW, and are also not otherwise restricted to being done by someone holding an "Inspector" PL. Anything to do with network assets is governed by ESR 35. Basically you need to be a...

AlecK

The image I found showed L6 as 250 V, with very similar pin config to the L5 125 V gear. Both being "single-phase" 3-pin (2 x live connections + E) The third one in the image was L14; being 4-pin 2-phase. Which I presume is the one shown in both Marinco & another manufacturer's info. No dimensions o...

AlecK

Bottom line is such equipment must be safe. ESR 80 sets the requirement; and also provides a pathway to achieving "electrically safe" for used appliances typically via "5761". Note that the tag specified is different from the normal tags specified by "3760" for in-service testing; and that it isn't ...

AlecK

True Clause (1) means ESR 24 only applies to RCDs that are required, and not to "extra" RCDs that are not required. But it's still an error for Clause (3) to say "and". 'And' means that both conditions have to be met. In this case , to be electrically unsafe, it must have a rated residual current > ...

AlecK

Note that MBIE is currently consulting on proposed updating of Standards cited in Schedules 2 & 4 of ESRs.
Submissions close 1 June

AlecK

The situation described meets one of the trigger conditions for "protection required" under 3.9.4.3.2 of "3000".
The permitted options are listed in 3.9.4.4.

AlecK

Yes; exactly the same application of ESR 113. If the cable has become electrically unsafe, then it is no longer permitted to remain in service. But not that the definition of 'electrically unsafe' [ESR 5] sets a high bar; there has to be "significant risk" of either "serious harm" or "significant" p...

AlecK

PeteRig's correct that single-strand conductors have never been prohibited in NZ. Also that ESR 113 allows anything that - complied when installed; - still complies with original rules; and - is not electrically unsafe to remain in service. There's no history of widespread failure / deterioration of...

AlecK

Nothing wrong with having a common submain supplying 2 (or more) DBs. Also nothing wrong with having them cascaded; however in that case you must deal with discrimination. Also note that, except for large submains to outbuildings as per 2.3.4.1 (a), a DB isn't required to have any isolating device o...

AlecK

The cable specs matter also.
Eg N/S rated for direct burial has increased sheath thickness; from memory 3.2 mm.

AlecK

Yes a CD is always required for Part 1 work; and yes there are additional requirements set within "3000" for info that must be included in Part 1 CDs. CDs are also required for all HV work [ESR 62] And yes a CD can be used for work intended to comply with Part 2 of 3000. So if you are provided with ...

AlecK

What is OK for pipes is not necessarily OK for unenclosed cables. The purpose of bedding pipes is about maintaining alignment, rather than protecting the pipes from damage. Whereas for cables, it's about avoiding any sharp / hard bits creating pressure on the cable sheath; which will eventually caus...

AlecK

Earthing Agree the screen will deal with any breakdown within the windings. In this case the screen was correctly connected to incoming shore power earth. The case wasn't, but now is. None of the relevant documents is as clear as they could be on the point of earthing the case of the tx. But clearl...

AlecK

The "AP 7" bit means "all passing 7 mm So the material has passed through a grille / sieve with holes 7 mm square. for all "AP grades; some of the particles will have a dimension > the 7 mm nominal size; having slipped through endways. AP 7 is probably fine for nice round pebbles. But the "S" means ...

AlecK

That only limits who can prepare a certified design (CD) for a "Part 1 solution". And the definition of "competent person" is open to a huge amount of interpretation anyway CDs are required for work to Part 1; but other work can also have a CD And there's no requirements for "competence" when it's n...

AlecK

I should modify my statement WRT space above dome; and say it will be un-zoned in most cases. I can't think of a real-world scenario where any zone would extend into it; but never say never. And it's certainly un-zoned for a fully-enclosed shower with door & dome; because that represents barriers al...

AlecK

6.2.1; para 4: Barriers .. that provide effective protection against spraying water, may be used to limit the extent of a classified zone. So as long as that dome is fixed in place, Z1 doesn't extend above it And no different really from using a door / curtain to limit the horizontal dimension of Z1...

AlecK

Yep; it's that simple. If you look back at the earlier provisions, installers had to have a signed design cert (ESR 58, of original ESRs issued 2010, called it a "declaration of conformity") before starting work. If it was issued by the installer, it provided no cover at all - a waste of time & pape...

AlecK

Thanks for your response; and the link. "3004" is clear that every item required by "3000" to be earthed must be connected to the shore power earthing system. That must include the case of the transformer used to provide (galvanic) isolation. Failing to make the change Contrary to your suggestion; t...

AlecK

Recently assessed an imported yacht for WoEF. Originally built in USA, so 115 V system; converted by some previous owner for 230 supply. Basically a nice system; with galvanic isolation by on-board isolating tx. Tx has dual windings for both primary & secondary; so can be set up in 4 different confi...

AlecK

Suggest it should be taken to Energy Safety

Not only non-compliant with the Guidelines, but electrically unsafe under ESR 23 on both counts
Refer (1)(d) for voltage rating; and (1)(g) for current rating of plug.

AlecK

Not before time.
We were expecting Schedules 2 & 4 to be amended late 2018.
Maybe this time something will actually happen

AlecK

ESR 90 applies.
Test i.a.w. "5762"

AlecK

Unless it's plugged in; in which case ESC not needed.
ESCs are for things - from equipment (accessories, appliances, etc) up to part or even complete installations - being connected to supply.
Certainly no CoC needed; CoCs are for PEW done on installations.

AlecK

There a - somewhat unkind - saying: "Those who can, do. Those who can't, teach". The "truth" in it is that not everyone who offers training actually knows their stuff as thoroughly as they should. Which is why we always need to ask "where does it say that" rather than just accept "the Gospel accordi...

AlecK

This is something that is open to a fair but of interpretqation. Some degree of movement / relocation of conductors is certainly permitted; because 6A(1) clearly allows for "relocation or extension of a conductor" for purposes of "facilitate replacement of a fitting". Remember the conductors are fit...

AlecK

That Exception in ESR4's definition of "mains work" is relevant; but not what i was getting at. It covers eg the feed-in from any private genset / inverter to an installation; both grid-connected and off-grid. It does mean that alt supply feed-ins are not "mains work". But they couldn't be mains wor...

AlecK

Since you're looking at EC values; we must be talking about fault protection. True that Table 8.1 doesn't show EC values for 5s for circuit breakers. That's because the info simply isn't needed. It's needed for fuses; because they are purely thermal devices. But for circuit breakers the fast-operati...

AlecK

There's one aspect where type of supply can seem to make a difference. Definition of "electrical installation" in the Act is in 2 parts; based on whether or not there's a "point of supply" for the installation . No PoS ( ie off-grid) means there are technically no "mains"; due to "mains" being defin...

AlecK

Requirements for certification, inspection, etc apply to PEW carried out on any "electrical installation" Same for the risk categories for PEW. And same for connection of installations / part installations under ESR 73A. The source of supply (if any) is not relevant to any of these aspects. Q1 is th...

AlecK

Yes it all hinges on those words "associated with". I agree with you; to me there's a direct association between the ELV input to an inverter and the output Regardless of ELV source: could be battery, micro-hydro, PV, or anything else. To me the fact of having an inverter creates an association betw...

AlecK

The most important but is that "mains work" - or any other type of PEW listed in 6A (2) as being high risk - can only be high risk if it isn't covered by clause (1). Many people seem to struggle with that concept. They ignore the words "not being low risk PEW", and assume that everything listed is a...

AlecK

3017 is the one; but you're right that current edition doesn't explain. Currently it's being revised ; should be out for Public Comment review soon; and will include much more info about selection of test equipment. The issue about suitability WRT earth continuity relates mostly to accuracy. All met...

AlecK

1 - moving a main switch to a different position on the switchboard to make space Low risk. Nothing new is being installed; and no alteration to the circuit config or that affects protection. It amounts to maintenance of the installation rather than an alteration 2 - installing a new mcb on mains or...

AlecK

Seems to be widespread that networks do their own thing, and often ignore ESRs. For example, it's very common for mains to be connected - Active(s) & Neutral - to the network, by network staff / contractors, long before anyone has issued a CoC - let alone an RoI - that says the mains are safe to be ...

AlecK

You often won't know which sockets are on same circuit, nor which order they're wired in. We're not responsible for the fact that someone else may have made an error before we got there,. We are responsible for testing that polarity of the socket we worked on is correct. Not so much that the right c...

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