Search found 912 matches
- Mon Apr 12, 2021 1:37 pm
- Forum: Testing & Verification
- Topic: Electronic recording of test results, COCs and ESCs
- Replies: 5
- Views: 4221
Re: Electronic recording of test results, COCs and ESCs
Depends on circumstances- it's about mitigating risk. EWRB regard records of test results as somehow 'proving" that testing was actually done. Whereas all it really proves is that the person knows what sorts of values are acceptable. Especially when most test results records sheets only permit one v...
- Mon Apr 12, 2021 8:40 am
- Forum: Testing & Verification
- Topic: Electronic recording of test results, COCs and ESCs
- Replies: 5
- Views: 4221
Re: Electronic recording of test results, COCs and ESCs
There's no reason certification documents for electrical work in installations can't be entirely electronic. Including the signature(s) - this aspect was covered by the Electronic Transactions Act 2002; but my understanding is that Act has been revoked and the relevant provisions are now elsewhere; ...
- Sun Apr 11, 2021 9:32 pm
- Forum: Damp Situations
- Topic: power points under eves
- Replies: 6
- Views: 5600
Re: power points under eves
You can't control stupid.
Even duct tape doesn't fix that
Even duct tape doesn't fix that
- Sun Apr 11, 2021 9:26 pm
- Forum: Earthing and Bonding
- Topic: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
- Replies: 6
- Views: 4749
Re: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
Yes; sometimes it takes a few tries to et things right.
- Sat Apr 10, 2021 10:25 am
- Forum: Earthing and Bonding
- Topic: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
- Replies: 6
- Views: 4749
Re: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
To be clear; Doug was correct in the sense that the actual connection of EBC to conductive pool structure doesn't have to remain accessible. But there does have to be an accessible bonding point for things like fences, lights, diving boards, ladders, etc; and putting that inside the pool pumproom ma...
- Sat Apr 10, 2021 10:20 am
- Forum: Earthing and Bonding
- Topic: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
- Replies: 6
- Views: 4749
Re: 5.6.2.6.4 Bonding Connector Connection Point (For Pools)
Not true to say the pool structure bonding point doesn't need to be accessible. When first introduced; the bonding point for the pool structure would have had to be accessible in many cases. prior to that, bonding the pool structure wasn't a universal requirement; rather it was something that had to...
- Tue Apr 06, 2021 9:52 am
- Forum: Inspection
- Topic: Micro hydro
- Replies: 1
- Views: 3030
Re: Micro hydro
I believe the intent of ESR 6A is that installation of the part of the system that's actually connected to the grid is what is considered high risk PEW. For comparison; consider a PV array supplying the inverter: inly the inverter part is treated as 'mains parallel'. The array gets considered separa...
- Wed Mar 31, 2021 6:22 pm
- Forum: Earthing and Bonding
- Topic: Earth stake directly into concrete
- Replies: 1
- Views: 3751
Re: Earth stake directly into concrete
Can't read an explanatory / supportive Note and ignore the words of the actual requirement: " effective contact with moist soil that is not subject to excessive drying out". Also, item (a) of Note to Condition (a) includes the words "exposed to weather". So if the ground in question has been paved o...
- Mon Mar 29, 2021 9:39 am
- Forum: Protective Devices
- Topic: Clause 2.5.3.3
- Replies: 3
- Views: 3826
Re: Clause 2.5.3.3
They do, but as with all protective devices you have to select the protection required for the conductor in question. The aim of s/c protection is to limit the time the high s/c current flows to less than the time needed for the particular conductor's temp to rise to the point where damage occurs (t...
- Fri Mar 26, 2021 7:33 pm
- Forum: Protective Devices
- Topic: Appendix H3.2.1, AS/NZS 3760:2010
- Replies: 2
- Views: 3963
Re: Appendix H3.2.1, AS/NZS 3760:2010
No.
This is really an Exception to the general rule [3.2] that 3-phase RCDs must be tested on a 3-phase supply.
It relaxes that general rule so that a single-phase supply can by used for the test, subject to either of the conditions.
This is really an Exception to the general rule [3.2] that 3-phase RCDs must be tested on a 3-phase supply.
It relaxes that general rule so that a single-phase supply can by used for the test, subject to either of the conditions.
- Fri Mar 26, 2021 7:27 pm
- Forum: Standards and Legislation
- Topic: ESR 6A - Low Risk Work
- Replies: 8
- Views: 3564
Re: ESR 6A - Low Risk Work
Not a field I play in much, but yes the rules are playing catch-up with the technology
and there can be significant mismatch between components
and there can be significant mismatch between components
- Fri Mar 26, 2021 10:06 am
- Forum: Protective Devices
- Topic: Clause 2.5.3.3
- Replies: 3
- Views: 3826
Re: Clause 2.5.3.3
If you have mains proctected by 63 A HRC fuse, and a 2.5 mm2 from main switch feeding a single 20 A mcb; then yes the 20A mcb can provide overload protection for the conductor feeding it as well as for the circuit it supplies. Same if instead of a single 20 A mcb; it was 2 x 10 A mcbs. Or 4 x 6 A. T...
- Fri Mar 26, 2021 9:53 am
- Forum: Standards and Legislation
- Topic: ESR 6A - Low Risk Work
- Replies: 8
- Views: 3564
Re: ESR 6A - Low Risk Work
No. Replacement - of anything - is maintenance work; not installation work. ESR 6A (1)says that all maintenance is low risk. And 6A(2) very carefully says that PEW can only be classed as high risk if 6A(1) hasn't made it low risk. Then 6A(3) says that anything not covered by (1) & (2) is 'general" P...
- Fri Mar 26, 2021 9:49 am
- Forum: Generators and Solar
- Topic: Tesla Power-Wall
- Replies: 8
- Views: 5176
Re: Tesla Power-Wall
Agree that there are significant fault current risks with even very small batteries, just because it's d.c. Remember the risk categories aren't about how risky the work is; but rather how crucial the work is to the installation being safe to use. There are things that arguably 'should' be classified...
- Fri Mar 26, 2021 9:17 am
- Forum: Testing & Verification
- Topic: Who can issue COV
- Replies: 1
- Views: 3334
Re: Who can issue COV
When first introduced (2003, as R 43A of the 1997 Regs) it was a "CoV" ; and only registered Inspectors and persons authorised under an employer licence could issue it. But since 2010 ESRs came into force; the term "certificate of verification" has had no official status; and the qualification for i...
- Fri Mar 26, 2021 9:05 am
- Forum: Standards and Legislation
- Topic: ESR 6A - Low Risk Work
- Replies: 8
- Views: 3564
Re: ESR 6A - Low Risk Work
Never hurts to get a 2nd opinion.
- Thu Mar 25, 2021 6:04 pm
- Forum: Standards and Legislation
- Topic: ESR 6A - Low Risk Work
- Replies: 8
- Views: 3564
Re: ESR 6A - Low Risk Work
Yes, it is replacement. Replacement of one fitting with another does not require that they be of the same general type, let alone the same brand 7 model number. When ESRs were first published (2010); the words of then ESR 66 [requirement for CoC] "This regulation does not apply to... (3)(d) the repl...
- Thu Mar 25, 2021 9:35 am
- Forum: Generators and Solar
- Topic: Tesla Power-Wall
- Replies: 8
- Views: 5176
Re: Tesla Power-Wall
Yes, should always use latest edition available UNLESS a particular provision conflicts with the cited documents - which isn't common, but does happen sometimes. Note also that the battery is covered by '3000" same as the rest of the installation, and "3000" 2018 +A1 cites 5139 [clause 7.8.2.15] As ...
- Wed Mar 24, 2021 12:53 pm
- Forum: Generators and Solar
- Topic: Tesla Power-Wall
- Replies: 8
- Views: 5176
Re: Tesla Power-Wall
PV arrays are "high risK" if > ELV. This applies to the array only. Mains parallel generation is always high risk; ie any situation with load connected to both mains and other (LV a.c.) source at same time. If set up as an alternative supply, so load can only be supplied from one source or the other...
- Tue Mar 23, 2021 1:46 pm
- Forum: Earthing and Bonding
- Topic: PELV Earthing
- Replies: 7
- Views: 5261
Re: PELV Earthing
The definitions from IEC are useful: PELV electric system in which the voltage cannot exceed the value of extra-low voltage: – under normal conditions and – under single fault conditions, except earth faults in other electric circuits SELV electric system in which the voltage cannot exceed the value...
- Fri Mar 19, 2021 9:13 am
- Forum: Welcome to the NZ's Electrical Forum
- Topic: Becoming an iqp for emergency lighting
- Replies: 3
- Views: 7168
Re: Becoming an iqp for emergency lighting
The requirements for becoming accredited vary depending on which area(s) you want to work in. The accreditation system , like the rest of the BWoF system, is run by territorial local authorities (TLAs), aka Councils. Each TLA has its own system / method / forms / requirements. Some work together, eg...
- Thu Mar 18, 2021 1:26 pm
- Forum: Earthing and Bonding
- Topic: Earth electrode In rock
- Replies: 4
- Views: 4599
Re: Earth electrode In rock
Yes concrete foundation in direct contact with ground complies with Exception (b) to 5.3.6.2, even if the "ground" happens to be rock .
And yes a horizontal electrode is likely to be superior.
Bearing in mind that you may need to bond the floor slab anyway, for other reasons [5.6.2.5]
And yes a horizontal electrode is likely to be superior.
Bearing in mind that you may need to bond the floor slab anyway, for other reasons [5.6.2.5]
- Thu Mar 18, 2021 10:01 am
- Forum: Earthing and Bonding
- Topic: Earth electrode In rock
- Replies: 4
- Views: 4599
Re: Earth electrode In rock
Rock isn't soil; and most types don't retain moisture. Horizontal electrodes are generally better than vertical. And the back-filled trench will count as "soil'. After all; you'll have put in some bedding for the cable even if most of the back-fill is stone. So if you have a nice handy trench for th...
- Thu Mar 18, 2021 9:47 am
- Forum: Inspection
- Topic: using 6mm as mains tails in a domestic DB
- Replies: 5
- Views: 5770
Re: using 6mm as mains tails in a domestic DB
6 mm2 is not good enough; even if using V90 conductor. True a 6 mm2 probably meets the requirement of 3.4.1 that the CCC be not less than the current to be carried. But that's only one of several requirements. Overload protection is not designed & installed on the basis of what's likely to happen; a...
- Mon Mar 15, 2021 4:18 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Are crimp links fittings
- Replies: 10
- Views: 4341
Re: Are crimp links fittings
Or thinks they do
- Mon Mar 15, 2021 9:05 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Are crimp links fittings
- Replies: 10
- Views: 4341
Re: Are crimp links fittings
I think the best approach, for any particular case, is to ask "how much access / space / lighting is needed for each the activities listed? That's actually not a single question, it's 15 questions. For a crimped joint with each crimp insulated, and then a sheath-substitute such as HD heat shrink ove...
- Sun Mar 14, 2021 9:46 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Are crimp links fittings
- Replies: 10
- Views: 4341
Re: Are crimp links fittings
At one time it would have been; 1976 Rs 63 & 64 ( there were exceptions for underground, in-floor, & MIMS) Being old-fashioned; I certainly don't consider it acceptable. But not aware of anything in "3000" that prohibits it. I believe ESR 20 is the nearest to a rule against it; just that some people...
- Sun Mar 14, 2021 9:33 am
- Forum: Transportable Installations
- Topic: Mobile Medical 6115
- Replies: 12
- Views: 5648
Re: Mobile Medical 6115
Of all that, the only relevant item is 5.8. Which as you admit, does not require compliance with any Standard. 5.8 sets only 2 requirements: "the incoming main isolating switch shall be trip if the supply lead earth wire resistance is outside preset limits". However no such resistance limits are set...
- Sat Mar 13, 2021 2:50 pm
- Forum: Selection and Installation of Wiring Systems
- Topic: Are crimp links fittings
- Replies: 10
- Views: 4341
Re: Are crimp links fittings
There used to be a specific rule that junction boxes had to be accessible; but now just this general rule. The amount of space/access needed varies according to circumstances. A properly-made in-line crimp joint, insulated to equivalent of double insulation, only needs the same access under that rul...
- Sat Mar 13, 2021 11:21 am
- Forum: Appliances
- Topic: Large 1ph appliances
- Replies: 1
- Views: 2973
Re: Large 1ph appliances
As long as the FLC doesn't exceed 10 A, and the work is done by a suitably licenced person then tested as per ESR 90; probably OK.
Unless they are a domestic type; unlikely to be DMRAs, so no SDoC req'd.
Unless they are a domestic type; unlikely to be DMRAs, so no SDoC req'd.
- Sat Mar 13, 2021 11:16 am
- Forum: Apprentices and training
- Topic: is it ok for apprentices to work alone?
- Replies: 6
- Views: 10395
Re: is it ok for apprentices to work alone?
Note that different guidelines apply for supervision of trainees than for supervision of (unlicenced) "persons under supervision".
Also different absolute limits of work; set in the Act
Also different absolute limits of work; set in the Act
- Sat Mar 13, 2021 11:13 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Are crimp links fittings
- Replies: 10
- Views: 4341
Re: Are crimp links fittings
"everything" means "everything, without exception; so yes crimp links are fittings.
Conductors ares also fittings - which makes interpreting Schedule 1 interesting
Conductors ares also fittings - which makes interpreting Schedule 1 interesting
- Fri Mar 12, 2021 1:03 pm
- Forum: Transportable Installations
- Topic: How to differentiate between a connectable installation and an appliance?
- Replies: 4
- Views: 3382
Re: How to differentiate between a connectable installation and an appliance?
Not what i said. Definition of CI does apply to more than just vehicles; "relocatable buildings" & "pleasure vessels" can also have connectable installations in them. And each of those classifications has its own grey area. But it would be difficult to confuse either of these with an "appliance"; wh...
- Fri Mar 12, 2021 12:42 pm
- Forum: General Electrical Discussions
- Topic: Building Inspector quoting from AS/NZS 3000:2018
- Replies: 7
- Views: 4982
Re: Building Inspector quoting from AS/NZS 3000:2018
other than work on "specified system' of buildings; electrical work is exempt from building consent. However some councils sneak it in, by various means, so it may actually be included in the consent in this case. However even where it is included in the consent; it still isn't something a 'building...
- Fri Mar 12, 2021 12:14 pm
- Forum: Transportable Installations
- Topic: How to differentiate between a connectable installation and an appliance?
- Replies: 4
- Views: 3382
Re: How to differentiate between a connectable installation and an appliance?
The definition of "connectable installation" comes from the Electricity Act, but relies for a key aspect on the definition of "vehicle" in another Act (from memory; the Road Transport Act). Basically anything that has wheels can be a "vehicle"; and any "vehicle" that is capable of accepting an exter...
- Fri Mar 12, 2021 11:52 am
- Forum: Transportable Installations
- Topic: Mobile Medical 6115
- Replies: 12
- Views: 5648
Re: Mobile Medical 6115
My statement that "the simple system fully complies with the requirement stated in the clause" is clearly with reference to clause 1.5. And is absolutely correct in that regard. OK, I accept that 2.8 makes it mandatory for monitored earth systems, when installed at service pillars, to comply with th...
- Wed Mar 10, 2021 3:12 pm
- Forum: Transportable Installations
- Topic: Mobile Medical 6115
- Replies: 12
- Views: 5648
Re: Mobile Medical 6115
you may not consider the simple system good enough. And I fully accept that the system referred to in A3 is superior. However facts are that 1 there is nothing in the Standard that makes that superior system mandatory; and 2 the simple system fully complies with the requirement stated in the clause....
- Wed Mar 10, 2021 2:08 pm
- Forum: Transportable Installations
- Topic: Mobile Medical 6115
- Replies: 12
- Views: 5648
Re: Mobile Medical 6115
With the simple system (and I expect with the ready-made unit); important that each PEC have separate connection at each end
- Wed Mar 10, 2021 10:29 am
- Forum: Transportable Installations
- Topic: Mobile Medical 6115
- Replies: 12
- Views: 5648
Re: Mobile Medical 6115
Found details in the 1976 Regs; in Notes to R 103. Description & Fig confirm what I recalled; main points being - LV: ELV transformer, out via PEC 1, to appliance, back via PEC 2, to n/o push-button, to contactor coil. In those days the extra PEC was often the CBS sheath of the appliance flex I'm su...
- Wed Mar 10, 2021 9:54 am
- Forum: Transportable Installations
- Topic: Mobile Medical 6115
- Replies: 12
- Views: 5648
Re: Mobile Medical 6115
Start by reading App A, clause A3; which includes additional information. And Fig 4 includes one While A3 talks about "requirements"; because App A is classified as Informative it can't set requirements; it's only guidance. The actual requirement - set by 1.5 for units with > 12 mA total leakage - i...
- Wed Mar 10, 2021 8:26 am
- Forum: Earthing and Bonding
- Topic: PELV Earthing
- Replies: 7
- Views: 5261
Re: PELV Earthing
We're used to mostly thinking in terms of LV supply from MEN; and for that earthing - in conjunction with protective devices - is the most common means of providing 'fault protection". What used to be called protection against indirect contact. That system involves very high fault current to operate...
- Tue Mar 09, 2021 3:32 pm
- Forum: Earthing and Bonding
- Topic: PELV Earthing
- Replies: 7
- Views: 5261
Re: PELV Earthing
Your 3rd reference appears to be in error; there is no 4.4.4.3 (iii). There is a 4.4.3 that's relevant, but it doesn't have any sub-paragraphs. The words quoted appear to be from 5.4.1.1. --------------- Perhaps a better question is what would be the advantage / benefit of providing an earth connect...
- Sat Mar 06, 2021 11:52 am
- Forum: Earthing and Bonding
- Topic: Aluminium kitchen splashbacks
- Replies: 2
- Views: 3631
Re: Aluminium kitchen splashbacks
Agree.
and if you earth them either with a dedicated, separate PEC; or at each fitting using that fitting's PEC;
then there's no risk of the earth being inadvertently removed during later alterations
and if you earth them either with a dedicated, separate PEC; or at each fitting using that fitting's PEC;
then there's no risk of the earth being inadvertently removed during later alterations
- Fri Mar 05, 2021 2:48 pm
- Forum: Earthing and Bonding
- Topic: Pool Equipment Bonding 5.6.2.6.1 (b)
- Replies: 6
- Views: 5104
Re: Pool Equipment Bonding 5.6.2.6.1 (b)
I'm reasonably confident that "not" shouldn't be there. But 20 years is a long time for an error like that to not be noticed. Especially when other aspects of that set of clauses have been amended several times. However while we can get in trouble for not bonding; there nothing to lose by bonding wh...
- Wed Mar 03, 2021 9:54 am
- Forum: Inspection
- Topic: Existing water pipe earth
- Replies: 2
- Views: 3330
Re: Existing water pipe earth
An existing electrode can be re-used. No requirement to upgrade. ESR 73A requires a check that a "main earthing system" exists. It doesn't require the electrode to comply with modern rules; just that there is one. But given the risk that the pipe may have been partially replaced with plastic; worth ...
- Wed Mar 03, 2021 9:19 am
- Forum: Off Topic
- Topic: Tell everyone your funny story
- Replies: 3
- Views: 7608
Re: Tell everyone your funny story
Stories of "old times" like that will probably raise a few laughs among the younger set and some wry smiles from those of us with similar memories. I remember a job where the local inspector/god reckoned the main earth wasn't good enough. So next day we added another electrode, and he came back - st...
- Tue Mar 02, 2021 6:45 pm
- Forum: Earthing and Bonding
- Topic: Steel bench top.
- Replies: 14
- Views: 9100
Re: Steel bench top.
this OP didn't ask for an explanation of equipotential bonding in general. He just wanted clarification as to whether either earthing or bonding was required in a particular case; and whether he had correctly identified and understood the relevant requirements Nor did the ECANZ FAQ try to provide an...
- Tue Mar 02, 2021 10:27 am
- Forum: Earthing and Bonding
- Topic: Steel bench top.
- Replies: 14
- Views: 9100
Re: Steel bench top.
Yes, if electrical fittings are mounted to a conductive surface (benchtop , splashback , wall lining, ceiling, foil-backed plaster-board, whatever); then the conductive material may need to be earthed. But note that there's a difference between "structural metalwork" and "conductive building materia...
- Mon Mar 01, 2021 4:22 pm
- Forum: Earthing and Bonding
- Topic: Steel bench top.
- Replies: 14
- Views: 9100
Re: Steel bench top.
protective earthing [5.2.1] is not required. the bench is not any of the things that is required to be earthed for fault protection by automatic disconnection of supply [5.4] It's not exposed conductive parts of electrical equipment [5.4.1.1], nor conductive building materials [5.4.1.2] . Even if it...
- Mon Mar 01, 2021 10:31 am
- Forum: Selection and Installation of Wiring Systems
- Topic: Cable Duct vs Conduit
- Replies: 4
- Views: 2421
Re: Cable Duct vs Conduit
If it isn't clearly marked with both duty and Standard; I wouldn't use it underground.
Or at least, not for LV installation wiring where the category depends on the duct / conduit.
Or at least, not for LV installation wiring where the category depends on the duct / conduit.