Search found 919 matches
- Fri May 12, 2023 2:54 pm
- Forum: Earthing and Bonding
- Topic: shape of horizontal earth electrode and distance between two main earth electrode
- Replies: 4
- Views: 3870
Re: shape of horizontal earth electrode and distance between two main earth electrode
That doesn't mean it has to be in a straight line. Eg could run for 3 m in one direction, then turn a corner for the rest. It could go out for 2.5m across for 2 m, and back parallel for 2.5 m; gibing total length of 7.5 m and min separation of 2 m. Not ideal, but we sometimes have to deal with restr...
- Fri May 12, 2023 2:36 pm
- Forum: Transportable Installations
- Topic: CI switchboard in damp situation
- Replies: 4
- Views: 4493
Re: CI switchboard in damp situation
Had prepared detailed answer, including WoEF process for imports under new edition Lost it all when posting, as had been disconnected. wrote this (shorter) version - locked out again\but this time remembered to copy before submitting Very frustrating. Looks like the old bug is back, and site managem...
- Fri May 12, 2023 8:50 am
- Forum: Transportable Installations
- Topic: Installation batteries
- Replies: 3
- Views: 3275
Re: Installation batteries
Part 1 is about fundamental principles; so best approach for a Part 1 Assessment is to follow through the various headings. 1.5.3 protection against shock; which is then detailed in 1.5.4 to 1.5.7 That's basic protection, fault protection, additiional protection (RCD), and basic + fault protections ...
- Thu May 04, 2023 11:14 am
- Forum: Electric Vehicles and Charging Systems
- Topic: EV isolators in public carparks
- Replies: 2
- Views: 3216
Re: EV isolators in public carparks
Note: loss of previous thread probably related to the entire site being down a day or spo ago
- Thu May 04, 2023 11:13 am
- Forum: Electric Vehicles and Charging Systems
- Topic: EV isolators in public carparks
- Replies: 2
- Views: 3216
Re: EV isolators in public carparks
Two different aspects. First there's the EV charging equipment; then there's the supply to it. The isolator requirement applies to the final subcircuit, so may be remote from the EVSE I can see nothing about how accessible the isolating device has to be. It has to be "lockable" . (Which is a require...
- Thu May 04, 2023 11:02 am
- Forum: Transportable Installations
- Topic: Inverter in connectable installation
- Replies: 12
- Views: 10688
Re: Inverter in connectable installation
WRT your suggestion that RCD-protected are somehow better suited; not really true. In a compliant CI installation, there's RCD protection for all final subcircuits; so it really doesn't matter whether the source is RCD-proected, oe isolated-output with switched N-E connection. For direct supply to e...
- Thu May 04, 2023 10:53 am
- Forum: Transportable Installations
- Topic: Imported switchgear IEC standards
- Replies: 2
- Views: 2169
Re: Imported switchgear IEC standards
All such devices are imported; nobody makes this stuff in NZ. As to whether compliance with IEC Standards is acceptable; check Schedule 4 (Part 5) of ESRs. However note that RCDs being installed under Wiring Rules are required to comply with one of the Standards cited in 2.6.2.2. These are all AS/NZ...
- Thu May 04, 2023 10:38 am
- Forum: Transportable Installations
- Topic: Installation batteries
- Replies: 3
- Views: 3275
Re: Installation batteries
Correct there is nothing in current WoEF requirements WRT batteries; and not much that applies to ELV. Note that ESRs require both LV & ELV (parts of) installations to comply with '3000"; and for connectable installations that's Part 2 + "3001". The situation you describe is dangerous, but nothing t...
- Thu May 04, 2023 10:32 am
- Forum: Transportable Installations
- Topic: Inverter in connectable installation
- Replies: 12
- Views: 10688
Re: Inverter in connectable installation
The first thing to check is whether the inverter is used to supply fixed wiring. If it's not fixed wiring, then there's no PEW; just plugging-in of appliances. Therefore Wiring rules simply do not apply. ESRs can apply to how things are used ( eg ESRs 88 & 89 , also ESR 15), but Wiring Rules only ap...
- Fri Apr 21, 2023 9:48 am
- Forum: Transportable Installations
- Topic: Ewof segregation
- Replies: 4
- Views: 3076
Re: Ewof segregation
The test required is between Active of the LV, and the ELV circuit. Not between A & N of the LV. For drivers / tranformers providing ELV supply; "3000" requires the ELV to be either SELV or PELV [7.5.2]. Either way the driver / tx has to provide electrical separation between LV input & ELV output. S...
- Fri Apr 21, 2023 9:13 am
- Forum: Transportable Installations
- Topic: 3001: 2022 edition
- Replies: 4
- Views: 6504
Re: 3001: 2022 edition
Agree probably no rush, but certainly worth getting them set up ready.
- Thu Apr 20, 2023 10:47 am
- Forum: Generators and Solar
- Topic: Alternative supply connected to db?
- Replies: 2
- Views: 2535
Re: Alternative supply connected to db?
this clause (7.3)applies only to generation system; subclause 7.8.3 is headed "connection to installation; and part 1 of it is headed alternative supplies. which tells us which conductors are being referred to: the N & the PEC of the wiring connecting the alternative supply to the installation. Ther...
- Thu Apr 20, 2023 10:06 am
- Forum: Transportable Installations
- Topic: Ewof segregation
- Replies: 4
- Views: 3076
Re: Ewof segregation
an example of an unearthed ELV circuit is the ELV side of a tx / driver for ELV lights.
- Thu Apr 20, 2023 10:03 am
- Forum: Transportable Installations
- Topic: Ewof segregation
- Replies: 4
- Views: 3076
Re: Ewof segregation
Yes; it's as simple as doing an IR test between Active of the LV system and each conductor of the ELV system(s). Basically this is the same test as used for LV circuits supplied via isolating tx. But note the wording of the requirement: the test is only required for "unearthed" ELV (both ac & dc). M...
- Thu Apr 20, 2023 9:56 am
- Forum: Transportable Installations
- Topic: 3001: 2022 edition
- Replies: 4
- Views: 6504
Re: 3001: 2022 edition
Your guess is as good as mine. The decision lies with the Ministry of Everything (MBIE), and they appear to have other priorities. Like setting up a Code of Ethics so the EWRB can punish us for even more offences; instead of customer disputes being settled via Disputes Tribunal & the district court....
- Wed Apr 19, 2023 2:03 pm
- Forum: Transportable Installations
- Topic: Transportable structure installed to construction demolision standard
- Replies: 11
- Views: 5732
Re: Transportable structure installed to construction demolision standard
Have to agree it's confusing. Seems to me the writers wanted to allow for cascading, but failed to do a proper job of it. But even if they'd done it correctly; ESRs would still over-ride any such provision. Especially while ESRs define any collection of 2 or more sockets intended for CIs as a "carav...
- Tue Apr 18, 2023 10:09 am
- Forum: Transportable Installations
- Topic: Transportable structure installed to construction demolision standard
- Replies: 11
- Views: 5732
Re: Transportable structure installed to construction demolision standard
True; but C 6.9 is not about RCD protection; it's about supply arrangements. The only reason it mentions RCDs is because the presence / location of RCD protection can affect two aspects of the supply arrangement: - whether an N-E link is permitted; and - whether the lead can be detachable. RCD prote...
- Mon Apr 17, 2023 10:32 am
- Forum: Transportable Installations
- Topic: Transportable structure installed to construction demolision standard
- Replies: 11
- Views: 5732
Re: Transportable structure installed to construction demolision standard
Overload protection is one factor. Modern CIs must have current limitation such that the current drawn cannot exceed the rating of the supply fittings. Typically these daisy-chained units do not comply, as the socket intended for plugging in another CI is either teed off at line side of main switch,...
- Sun Apr 16, 2023 7:38 am
- Forum: Earthing and Bonding
- Topic: shape of horizontal earth electrode and distance between two main earth electrode
- Replies: 4
- Views: 3870
Re: shape of horizontal earth electrode and distance between two main earth electrode
There is no rule on either shape or separation in "3000". But clearly the straighter the better and the further apart the better. In "3017", Fig 3.23 illustrates testing resistance of earth electrode; and suggests 30 - 50 m separation between the electrode being tested and a second electrode used to...
- Sat Apr 15, 2023 12:16 pm
- Forum: Transportable Installations
- Topic: Transportable structure installed to construction demolision standard
- Replies: 11
- Views: 5732
- Sat Apr 15, 2023 7:54 am
- Forum: Transportable Installations
- Topic: Transportable structure installed to construction demolision standard
- Replies: 11
- Views: 5732
Re: Transportable structure installed to construction demolision standard
That Note only affects the intervals, not the requirement for periodic verification. What the table is doing - or trying to do - is reducing the 4 years set by ESR 78 to 6 months; and the Note simply points out that this 6-month interval set by the Table does NOT over-ride the interval set by ESR 78...
- Sat Apr 15, 2023 7:38 am
- Forum: Standards and Legislation
- Topic: ESR 59 (3)(b) VS AS/NZS 3000:2007 2.6.3.4
- Replies: 2
- Views: 2817
Re: ESR 59 (3)(b) VS AS/NZS 3000:2007 2.6.3.4
NZ law has a general principle that there are no mandatory upgrades, though there are occasional exceptions to that. ESR 113 enshrines this principle. and so does ESR 59 (3)(b). In particular, the "maintain in original condition" provision allows us to replace an old, degraded, SERF with a brand new...
- Thu Apr 13, 2023 10:50 am
- Forum: Standards and Legislation
- Topic: NZS6116:2006 Black EB Conductors
- Replies: 2
- Views: 2446
Re: NZS6116:2006 Black EB Conductors
Correct that most EBCs must be green / yellow; with only those for metalwork that is an electrode of the appliance being black.
- Thu Apr 13, 2023 10:47 am
- Forum: Standards and Legislation
- Topic: NZS6116:2006 Transformer supplying electrodes
- Replies: 2
- Views: 2538
Re: NZS6116:2006 Transformer supplying electrodes
I presume you meant Row 3, not row 2. And while it specified a check; it also gives the reference on which that check is based: in this case 2.1.2 "Barrier" is defined in 1.4; which over-rides the usual meaning of the word. Therefore if the electrodes have barriers (as defined); then the tx need not...
- Thu Apr 13, 2023 10:29 am
- Forum: Standards and Legislation
- Topic: NZS6116:2006 Metal Enclosure in equipotential zone
- Replies: 2
- Views: 2560
Re: NZS6116:2006 Metal Enclosure in equipotential zone
Correct that the point of an equipotential Zone (EZ) is to avoid having simultaneously accessible metal at two different potentials. See definition in 1.4. The wording of 3.4.1 is clear that specified types of metalwork must be bonded together, and the resulting EZ must be connected to a local elect...
- Thu Apr 13, 2023 9:54 am
- Forum: Transportable Installations
- Topic: Inverter in connectable installation
- Replies: 12
- Views: 10688
Re: Inverter in connectable installation
Correct that safety assessment of WoEF of a NZ-built land-based CI only needs to look at the matters specified in App C of "3001"; not all the other matters specified in main body of the standard; which apply to constructing the CI. That's on the basis that the CI has originally been installed to co...
- Tue Apr 11, 2023 7:23 pm
- Forum: Electric Vehicles and Charging Systems
- Topic: Tesla Gen.3 Wall Charger
- Replies: 9
- Views: 8379
Re: Tesla Gen.3 Wall Charger
Overload protection can be provided at any point on a circuit. However short circuit protection can only be provided for points downstream of the protective device. Similarly for RCD protection, which is about a curent imbalance in the part of the circuit downstream of the protective device. Imbalan...
- Tue Apr 11, 2023 8:42 am
- Forum: Electric Vehicles and Charging Systems
- Topic: Tesla Gen.3 Wall Charger
- Replies: 9
- Views: 8379
Re: Tesla Gen.3 Wall Charger
It may be that the requirement for the RCD protection to be at origin of circuit is excessive.
But - unless & until it is changed - it's still the requirement.
And complying with a requirement is never a "waste of money"
But - unless & until it is changed - it's still the requirement.
And complying with a requirement is never a "waste of money"
- Mon Apr 03, 2023 9:54 am
- Forum: Electric Vehicles and Charging Systems
- Topic: Tesla Gen.3 Wall Charger
- Replies: 9
- Views: 8379
Re: Tesla Gen.3 Wall Charger
Since I had no involvement in writing Worksafe's Guidelines; I can only speculate as to why those words are there. The wording "purpose build RCD tester" doesn't specify any particular functionality. But it suggests not the RCD's integral push-button. Only suggests; because it can be argued that the...
- Sat Apr 01, 2023 11:07 am
- Forum: Electric Vehicles and Charging Systems
- Topic: Tesla Gen.3 Wall Charger
- Replies: 9
- Views: 8379
Re: Tesla Gen.3 Wall Charger
Correct on both points. Both 7.9.3 (domestic) & 7.9.4 (other) specify that the "subcircuit" shall be protected; and you can't provide this protection at the downstream end. And the verification specified for newly-installed RCDs [8.3.10] is exactly the same for all types. So yes the test for a car-c...
- Thu Mar 30, 2023 10:03 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Earthing of aluminum ladder
- Replies: 6
- Views: 8649
Re: Earthing of aluminum ladder
Apologies for the error
- Sat Mar 25, 2023 12:33 pm
- Forum: Testing & Verification
- Topic: Testing/Verification of your testing instruments
- Replies: 1
- Views: 2158
Re: Testing/Verification of your testing instruments
latest "3017" includes basic checks of operation of test equipment.
NOT calibration, but enough to show that the instrument is working adequately.
There are also test boxes that do most of these checks easily; costing from around $1500.
NOT calibration, but enough to show that the instrument is working adequately.
There are also test boxes that do most of these checks easily; costing from around $1500.
- Sat Mar 25, 2023 12:29 pm
- Forum: Standards and Legislation
- Topic: Limits of work for a Distribution line Mechanic (LMD)
- Replies: 4
- Views: 3497
Re: Limits of work for a Distribution line Mechanic (LMD)
Can't see why not.
The basic LMD allows work on lines that are part of distribution infrastructure. including within an installation.
The endorsement allows other work on the installation, but limited to restoring supply
The basic LMD allows work on lines that are part of distribution infrastructure. including within an installation.
The endorsement allows other work on the installation, but limited to restoring supply
- Fri Mar 24, 2023 9:33 am
- Forum: Earthing and Bonding
- Topic: 5.5.1.3 Labelling (Main earth)
- Replies: 1
- Views: 1974
Re: 5.5.1.3 Labelling (Main earth)
Correct that the wording specified in Cl 5.5.1.3 includes the word "main"; and that many commonly-available labels don't have this word - instead they continue to use the older form of wording (as required by 1976 Reg 158). There are some tags available that have the fully-correct wording. But I bel...
- Fri Mar 24, 2023 9:15 am
- Forum: Appliances
- Topic: FRUUGO electrical fittings
- Replies: 1
- Views: 2140
Re: FRUUGO electrical fittings
Correct to be cautious, even suspicious of items from non-standard sources. But SDoCs are not required in order for fittings to be installed; ESR 83 relates only to sale / supply, in NZ, of DMRAs. For an installer, an SDoC can be relied on when cetifying; but isn't actually required before installin...
- Fri Mar 24, 2023 8:57 am
- Forum: Standards and Legislation
- Topic: Limits of work for a Distribution line Mechanic (LMD)
- Replies: 4
- Views: 3497
Re: Limits of work for a Distribution line Mechanic (LMD)
Actually to the "incoming terminals"; as per definition of "electric line" in ESR 4. So the "infographic" (dreadful term!) is correct that "lines " is not limited to "works" only, but can include conductors that are part of the "installation" For typical o/h supply, the mains entry box for both A(s)...
- Wed Mar 22, 2023 9:53 am
- Forum: Electric Vehicles and Charging Systems
- Topic: EVSE and pool zones
- Replies: 4
- Views: 3962
Re: EVSE and pool zones
"Socket outlet " is a defined term; and includes all types (both LV & ELV). Including cord ext sockets on the end of a lead. There's no need for S.6 to be specific about types of socket; in fact any attempt to be specific would just open up loopholes. Any socket in the Zone must comply with the shoc...
- Tue Mar 21, 2023 11:47 am
- Forum: Electric Vehicles and Charging Systems
- Topic: EVSE and pool zones
- Replies: 4
- Views: 3962
Re: EVSE and pool zones
Depending on Mode; it's either a socket outlet (6.3.4.3), or it's other electrical equipment (6.3.4.5).
- Tue Mar 07, 2023 3:34 pm
- Forum: Generators and Solar
- Topic: generator supply in an emergency
- Replies: 4
- Views: 3361
generator supply in an emergency
Worksafe have published a "technical bulletin" (guidance document) for short-term connection of a genset to an installation in emergency. Available here: https://www.worksafe.govt.nz/about-us/news-and-media/connecting-a-generator-to-the-wiring-of-a-house-or-building-following-an-emergency/ and can b...
- Mon Mar 06, 2023 9:42 am
- Forum: Appliances
- Topic: Nuisance tripping by choice
- Replies: 3
- Views: 5214
Re: Nuisance tripping by choice
The rule is that we must size conductors for the load to be carried, and then we protect them so they don't get overloaded. The 2nd part of that is absolute; we can't allow any margin on over-current protection. But for the 1st part we can allow for the fact that the entirety of the connected load w...
- Fri Mar 03, 2023 12:28 pm
- Forum: Generators and Solar
- Topic: Certification of solar works
- Replies: 1
- Views: 2033
Re: Certification of solar works
The short answer is that those aspects that are prescribed electrical work (PEW) must be done by an authorised person. Authorisation being either a current practicing licence, or via an employer licence. PEW is defined in Schedule 1 of ESRs. Installing ELV conductors / fittings is not PEW unless it'...
- Fri Feb 24, 2023 3:13 pm
- Forum: Earthing and Bonding
- Topic: LM certifying main earth
- Replies: 3
- Views: 2699
Re: LM certifying main earth
Unless endorsed, a LM can't install or certify conductors / fittings that are part of an installation.
They are limited to work in distribution lines
They are limited to work in distribution lines
- Fri Feb 24, 2023 3:05 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Earthing of aluminum ladder
- Replies: 6
- Views: 8649
Re: Earthing of aluminum ladder
Normal lugs are zinc-plated copper. zinc is close to aluminium on the galvanic scale. (closer than zinc & copper are!) And unless you have moisture, you won't get much galvanic corrosion. IF - and it's a big if - I wanted to earth the ladder I'd just use normal lugs and maybe use an anti-corrosion t...
- Fri Feb 24, 2023 2:58 pm
- Forum: Switchboards
- Topic: Large Switchboard in Container
- Replies: 3
- Views: 7639
Re: Large Switchboard in Container
I agree.
It's over the trigger point for requiring a 2nd exit; and ALL doors in exit paths must open out without use of key/tool
It's over the trigger point for requiring a 2nd exit; and ALL doors in exit paths must open out without use of key/tool
- Fri Feb 24, 2023 2:54 pm
- Forum: Transportable Installations
- Topic: Inverter in connectable installation
- Replies: 12
- Views: 10688
Re: Inverter in connectable installation
Exactly right.
Doesn't have to fully comply with that Standard - which covers portable inverters only.
But must comply with the safety requirements for one of the types listed.
The standard also includes a third type, and these are not permitted under "3001"
Doesn't have to fully comply with that Standard - which covers portable inverters only.
But must comply with the safety requirements for one of the types listed.
The standard also includes a third type, and these are not permitted under "3001"
- Sun Dec 18, 2022 12:53 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Lifeguard units - do they need RCD protection on supply?
- Replies: 10
- Views: 9504
Re: Lifeguard units - do they need RCD protection on supply?
2.1.2 allows 3 options. You don't have any "constriction wiring", so option (a) is not available. If it were available additional protection would have to be i.a.w 2.4.6.1. You're not planning to use a "standalone power source", so not option (c) either. If you were; you'd have a choice of additiona...
- Fri Dec 16, 2022 8:11 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Lifeguard units - do they need RCD protection on supply?
- Replies: 10
- Views: 9504
Re: Lifeguard units - do they need RCD protection on supply?
Yes the Lifeguard unit, including its lead, are within scope of 3012.
But that doesn't affect the socket you are going to install for that unit to plug into,
which is not within scope of '3012".
And since compliance with "3012" isn't mandatory, just go with 2.4.6.2 .
But that doesn't affect the socket you are going to install for that unit to plug into,
which is not within scope of '3012".
And since compliance with "3012" isn't mandatory, just go with 2.4.6.2 .
- Fri Dec 16, 2022 4:57 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Lifeguard units - do they need RCD protection on supply?
- Replies: 10
- Views: 9504
Re: Lifeguard units - do they need RCD protection on supply?
As the new socket is part of the permanent installation, rather than "construction wiring" that will be removed on completion of construction, you can ignore "3012" and just apply RCD protection as per 2.6 of "3000". There is no requirement for discrimination between RCDs. Which is probably because ...
- Fri Dec 16, 2022 9:01 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Lifeguard units - do they need RCD protection on supply?
- Replies: 10
- Views: 9504
Re: Lifeguard units - do they need RCD protection on supply?
I'm assuming that this is a construction sute, and that your references are to cited edition of 3012. You seem to have missed 2.4.6.1; which requires all final subcircuits to have "additional protection" by RCD. your FS is supplying a socket outlet, and none of the Exceptions applies. So the basic a...
- Wed Dec 14, 2022 2:30 pm
- Forum: Standards and Legislation
- Topic: ESR 25 (d) vs AS/NZS3000:2007 7.8.2.1
- Replies: 1
- Views: 4581
Re: ESR 25 (d) vs AS/NZS3000:2007 7.8.2.1
You are correct that ESRs (deliberately) do not make following "3012" mandatory. As per ESR 59 requires, as a minimum, compliance with "3000" (via either of 2 Parts). And obviously of you adopt Part 1 rayher than Part 2, you need a CD. If you go on to follow "3012" (cited edition) you can't be wrong...