Installing VSD in New Zealand
Southern Technology · Technical guide
Supplying and installing variable speed drives in New Zealand
What the law actually requires of us as the supplier, what you need for your Certificate of Compliance, what the lines company will ask for on a big irrigation drive, and why a garage lathe is a different job from a factory pump.
Prepared September 2026 · Reflects the Electricity (Safety) Amendment Regulations 2025 (in force 13 Nov 2025) · Review annually
The short answer to "where's the SDoC?"
A Supplier Declaration of Conformity is a document the regulations require only for declared medium-risk articles (Reg 83, Electricity (Safety) Regulations 2010). Fixed-wired industrial variable speed drives are not on the declared medium-risk or high-risk lists, so there is no SDoC to issue and no register to look them up in. That is not a loophole; it is how the risk-tiered system works.
What the regulations do require is that every fitting we sell is electrically safe (Reg 80) and that we can show evidence of it (Reg 81). Separately, Radio Spectrum Management requires every drive to carry an EMC Declaration of Conformity and the RCM mark (Radiocommunications (Compliance) Notice 2020). So the documents you should ask us for are the safety test evidence to IEC 61800‑5‑1, the EMC Declaration of Conformity, and the installation manual. Those are what we supply, and those are what you record on the CoC.
On this page
- For electricians: the legal position
- What comes with every drive
- Filling in the CoC
- Installation points specific to drives
- For irrigation customers: harmonics
- Lines company requirements by region
- Harmonic mitigation options
- Home workshop installs
- What we have confirmed and what to check
- Sources
For electricians
The legal position, what we hand over, and what goes on your paperwork.
1. Where a VSD sits in the Electricity (Safety) Regulations 2010
Part 6 of the regulations (Regs 80–86A) sorts electrical products into three tiers, and the paperwork follows the tier:
| Tier | Examples on WorkSafe's gazetted lists | Supplier must hold | VSD? |
|---|---|---|---|
| Declared high‑risk Reg 84–86A | Household appliances, plugs and sockets, wall switches, RCDs and MCBs to 125 A, portable tools, plug‑in arc welders, ELV chargers | Approval (or deemed approval via a recognised certificate) before sale | Not listed |
| Declared medium‑risk Reg 83 | Household appliances, luminaires, cables, toys, Li‑ion batteries, EV chargers, "control or conditioning devices" that are household type, portable, and cord‑and‑plug connected | Supplier Declaration of Conformity, produced within 10 days of an Energy Safety request | Not listed |
| Everything else ("low‑risk") Reg 80–82 | Fixed‑wired industrial control gear, including frequency drives | Evidence that the product is electrically safe; no declaration form, no approval | This tier |
WorkSafe's SDoC page says it plainly: the SDoC "is required for declared medium risk articles" and does not apply to low‑risk products. The November 2025 amendments changed cited standards and the low‑voltage tolerance but made "no change to the gazetted declared article schemes".
The obligations that do bite on a low‑risk fitting:
- Reg 80 — a new fitting offered for sale must be electrically safe, and is deemed safe if it complies with AS/NZS 3820:2020 (Essential safety requirements) or the applicable standard in Schedule 4. Knowingly selling an unsafe fitting is an offence.
- Reg 81 — a test report from an accredited laboratory (or certificate from an accredited body) is conclusive evidence of compliance. Non‑accredited reports can be used but carry less weight.
- Reg 82 — offences for false or misleading compliance markings.
- WorkSafe's guidance on non‑declared fittings: they "should still be verified by a recognised test report that they comply with a relevant standard."
The honest gap in the system. There is no AS/NZS adoption of the drive safety standard; Standards NZ sells IEC 61800‑5‑1 (Adjustable speed electrical power drive systems — safety requirements) directly, and it does not appear to be cited by name in Schedule 4. In practice a drive's safety case rests on an IEC 61800‑5‑1 test report or IECEE CB certificate, framed as meeting the essentials of AS/NZS 3820. A bare "CE certificate" from an offshore test house is a self‑declaration wrapper, not accredited evidence, and on its own is weak under Reg 81. We say so because electricians are entitled to know what they are relying on.
2. EMC is the declaration that is mandatory
Radio Spectrum Management (RSM, part of MBIE) regulates emissions from electrical products under the Radiocommunications Act. A VSD is a Level 2 product: the Radiocommunications (EMC Standards) Notice 2019 lists "electronic devices operating in a switching or non‑linear mode such as … motor speed controllers" at Level 2, and names IEC 61800‑3 / EN 61800‑3 as the applicable standard for adjustable speed drives. Only the emission requirements of the standard apply; immunity is not regulated.
For a Level 2 product the New Zealand supplier (importer or reseller, not the offshore factory) must: hold a test report or other reasonable documented evidence of compliance with IEC 61800‑3; hold a product description; make a Declaration of Conformity; be registered as a responsible supplier on the ERAC database; apply the RCM mark (at least 3 mm high, near the model label, or on the packaging and instructions where the product is too small); and keep those records for five years after the product is last supplied, producing them within 10 working days of a request.
RSM's Public Information Brochure 49 on power drive systems adds the installation side: drives that are neither plug‑in nor movable "should be installed by persons that have the necessary skills and experience", following the manufacturer's EMC instructions on screened cable, screen termination, maximum cable length, segregation, external filters and functional earthing. If a drive interferes with radio services, RSM can require the operator to modify or switch it off and can issue infringement notices.
3. What comes with every Southern Technology drive
This is the compliance pack for the two product families on this site (Sinee EM730 three‑phase 400 V drives, and the SU900 single‑phase‑in / three‑phase‑out range). Ask for any item you don't have.
| Document | Purpose | Legal basis | Status |
|---|---|---|---|
| Safety test evidence to IEC 61800‑5‑1 (test report and, where the factory holds one, an IECEE CB certificate) for the exact model and 400 V / 50 Hz rating | Shows the fitting is electrically safe | Reg 80–81; AS/NZS 3820:2020 | Required evidence |
| EMC Declaration of Conformity naming IEC/EN 61800‑3, the EMC category (C2 or C3) and the conditions it was tested under (filter, screened cable, cable length), with our ERAC supplier number | RSM Level 2 supplier obligation; RCM mark on the product | Radiocommunications (Compliance) Notice 2020; (EMC Standards) Notice 2019 | Mandatory |
| Installation and operating manual in English, stating rated input voltage range, input current, recommended fuse/MCB, SCCR, terminal sizes, earth‑leakage and RCD‑type note, cable screening and EMC installation instructions | You will record reliance on it on the CoC | Reg 66(1)(d), 67(1)(d) | Supplied |
| Supplier Declaration of Conformity (Reg 83 form) | Only applies to declared medium‑risk articles | Reg 83 | Not applicable to VSDs |
| EESS / RCM database registration of the product | Australian scheme; not recognised in NZ for declared‑article compliance and not required for a low‑risk fitting | WorkSafe core requirements | Not required |
| Harmonic emission data (THDi at 100 %/75 %/50 % load, spectrum to the 50th harmonic, with and without reactor or filter) | Needed by the lines company for drives above 20 kW | Reg 31; lines company connection standard | On request, 20 kW and up |
4. Filling in the Certificate of Compliance
Installing a drive on a new or altered final subcircuit is general prescribed electrical work: a Certificate of Compliance plus an Electrical Safety Certificate, issued within 20 days and kept for seven years. No independent inspection is needed unless the job also touches mains, the MEN, a hazardous area or another high‑risk category.
The CoC checklist items that a drive touches:
- Reg 66(1)(a) — you certify the work was done lawfully and safely. The basis for saying the drive is a safe fitting is our safety evidence and the manufacturer's instructions, not an SDoC.
- Reg 66(1)(d) — attach or reference any manufacturer's instructions used in the course of the work. Reference the drive manual by title and revision.
- Reg 67(1)(c)–(d) — record other standards complied with and whether the work relied on manufacturer's instructions. Tick "yes" and name the manual.
- Reg 67(1)(e)–(f) — state the supply system and which parts of the installation are safe to connect. The WorkSafe template's question "Contains fittings that are safe to connect to a power supply?" is answered from the same evidence.
- "The work relies on a Supplier Declaration of Conformity (SDoC)" — No, because the fitting is not a declared article. Leave it unticked rather than hunting for a document that doesn't exist.
- Cite the version of AS/NZS 3000 you used. AS/NZS 3000:2018 (Amendments 1–3) became a cited option on 13 November 2025 and is mandatory for work started after 12 November 2026; until then the 2007 edition with Amendments 1–2 remains valid.
5. Installation points specific to drives
Supply voltage
Standard low voltage in NZ is 230 V phase‑to‑neutral / 400 V three‑phase, and since 13 November 2025 the network may hold it within ±10 % (previously ±6 %) — Reg 28 as amended. A drive can therefore see 360–440 V. The EM730 is rated 340–460 V input and covers that window. Drives marked "380 V" with only a ±10 % window (342–418 V) are marginal on a high‑set Canterbury rural feeder; check the manual's input range, not the nameplate headline.
Earth leakage and RCD type
Every drive with an EMC filter has capacitors to earth. Manufacturers across the board state leakage above 3.5 mA, which under IEC 61800‑5‑1 means a fixed installation with a permanent protective earth sized for high‑leakage equipment — no plug‑and‑socket connection.
Three‑phase input drives use a six‑pulse bridge, so an earth fault on the DC side or motor side produces a smooth DC component that can blind a Type A or Type AC RCD. Drive manufacturers (ABB, Danfoss, Schneider, Siemens, Invertek) specify a Type B RCD for three‑phase drives; single‑phase‑input drives are commonly cleared for Type A, but some makers (Invertek, Parker) still specify Type B. AS/NZS 3000 does not name a type for drives; it requires the RCD to be compatible with the load, and Amendment 2 phases out Type AC. Follow the manual for the specific drive, and expect nuisance tripping on a 30 mA device with long motor cables unless the drive is on its own RCD and the cable run is short.
EMC category and screened cable
IEC 61800‑3 category is a rating of the drive as installed. The EM730's built‑in filter is specified as close to Category C3 (industrial, "second environment" — premises not fed from the same LV network as houses). Category C3 compliance requires the screened motor cable, 360° screen termination and cable length stated in the manual. For a site on a public LV network that also feeds dwellings (first environment), a C2 external filter is the compliance condition. See the home workshop section below.
Isolation and motor control
The motor isolator must be rated for the motor's full‑load current and capable of breaking the stall current (AS/NZS 3000 clause 4.13, utilisation category AC‑23 or de‑rated). Do not switch the drive output under load with a contactor unless the drive is configured for it. Under the machinery rules (AS/NZS 4024, IEC 60204‑1) a machine must not restart on its own after power is restored or an emergency stop is released: set the drive so a run command present at power‑up does not start the motor, and give machine tools a proper emergency stop (category 0 via a contactor upstream, or the drive's Safe Torque Off where fitted).
Harmonics on the CoC
Reg 31 requires that fittings do not unduly interfere with supply to others, and deems harmonic compliance if NZECP 36:1993, IEC 61000‑3‑2, IEC/TS 61000‑3‑4 or IEC 61000‑3‑12 (as applicable) is met. Below about 20 kW nobody will ask; from 20 kW the lines company will. Details in the irrigation section.
For irrigation and pump customers
Why the lines company cares about your 100 kW drive, what they will ask for, and how to get connected first time.
6. What harmonics are and why the network cares
A standard variable speed drive rectifies the incoming AC to DC and then makes its own three‑phase output for the motor. The rectifier draws current in short pulses rather than a smooth sine wave. Those pulses contain harmonic currents — mostly the 5th (250 Hz) and 7th (350 Hz) — that flow back through the transformer and lines. Harmonic current times line impedance equals harmonic voltage distortion, which every other customer on that feeder then sees: overheating transformers and neutrals, capacitor failures, mis‑operating ripple‑control relays, and nuisance tripping of other people's electronics.
Canterbury learnt this the hard way. University of Canterbury measurements on Orion's Darfield 11 kV feeder found voltage distortion "sometimes exceeded 8 % while the regulatory limit is 5 %" because of unfiltered irrigation drives; a single 160 kW six‑pulse drive measured around 30 % fifth‑harmonic current. EA Networks recorded "a rapid increase in harmonic levels on its network" as pivot irrigation took off, introduced a harmonics standard, ran a filter subsidy, and now bills unmitigated irrigation connections on a penalty tariff and can disconnect persistent non‑compliers.
7. The rules, from the top down
- Electricity (Safety) Regulations 2010, Reg 31 — your installation must not unduly interfere with supply to anyone else. Harmonic compliance is deemed if the applicable one of NZECP 36:1993, IEC 61000‑3‑2 (equipment ≤16 A per phase), IEC 61000‑3‑12 (16–75 A per phase) or IEC/TS 61000‑3‑4 (over 75 A) is met. A 100 kW / 400 V drive draws roughly 180 A, so it is in the last bracket, where in practice the lines company's connection standard governs.
- NZECP 36:1993 Harmonic Levels — the NZ code of practice, still current and still cited: total harmonic voltage distortion at any point of common coupling below 66 kV shall not exceed 5 %, with no odd harmonic above 4 % and no even harmonic above 2 %. It allocates the allowance between customers "in proportion to their maximum demand". It sets no LV current limits, which is why lines companies fill that gap with their own standards. The Electricity Authority consulted in 2026 on replacing it with the AS/NZS 61000 series and the EEA Power Quality Guidelines; no change has been made at the time of writing.
- Lines company connection standard — your contract for connection. This is where the numbers that will actually be tested live, and they differ by company (next section).
- EEA Power Quality Guidelines (2024) — the industry guide most distributors now use for allocation, based on AS/NZS 61000.3.6 and 61000.3.7 and referencing IEEE 519‑2022.
8. Lines company requirements by region
Current published requirements for the networks where our irrigation customers are. Every one of these triggers at 20 kW of drive capacity, and several treat it as the combined rating of all drives at the installation, so two 15 kW pumps on one connection are in scope.
| Network | Trigger | Harmonic current limit | Ripple control | Power factor | Other |
|---|---|---|---|---|---|
|
Orion Christchurch, central Canterbury |
Notify Orion of every individual non‑linear load over 20 kW; over 275 kW / 400 A gets an individual assessment | THDi <10 % rural THDi <16 % Christchurch urban (at full load) |
175 Hz and 317 Hz; filters "must be designed not to absorb or interfere with these signals" | ≥0.95; irrigation motors over 20 kW corrected to ≥0.98 (submersible) / ≥0.96 (surface) | No DOL starting of 3‑phase motors over 4 kW without approval; load control on all irrigation over 20 kW |
|
EA Networks Mid‑Canterbury |
All new or updated rural supplies must meet the EA Networks Rural Harmonics Standard | Per their standard (request current version) | 283 Hz Decabit relay mandatory on irrigation over 20 kW | 0.95 lag to 0.95 lead, true power factor | Unmitigated irrigation billed on the "Irrigation without harmonic mitigation" price category; disconnection possible |
|
MainPower North Canterbury |
All VSDs over 20 kW combined | IEEE 519 TDD table: 5 % (Isc/IL <20), 8 % (20–50), 12 % (50–100), 15 %, 20 % THDv 5 %, individual 3 % |
283 Hz; equipment shall not interfere | ≥0.95 true; irrigation PFC typically over 20 kW | Compliance form 3 weeks before testing; full‑load test; "disconnection of supply or delayed connection" on failure |
|
Alpine Energy South Canterbury |
All VSDs over 20 kW combined | Same IEEE 519 table; Alpine states most rural PCCs fall at Isc/IL 20–50, i.e. 8 % TDD, 7 % for harmonics below the 11th | 317 Hz; equipment shall not interfere | No "unreasonably low leading PF at reduced load" | Form 1 (manufacturer spectrum) before install; Form 2 commissioning test at 100/75/50/25/0 % load; tests completed before the irrigation season |
|
Aurora Energy Otago |
Equipment 20 kW and over must demonstrate compliance on request | IEEE 519‑style table by load‑to‑transformer ratio (5 % to 20 % TDD); THDv 5 %, individual 3 % | 317 Hz Central Otago; 1050 Hz Dunedin | ≥0.95 | Unblocked capacitors limited (2 % of connection kVA in Dunedin) |
|
Waipā Networks Waikato |
Any VSD over 20 kW | THDi ≤10 % | — | ≥0.95 | Unblocked capacitors ≤2 % of connection kVA |
| Powerco, WEL, Vector, PowerNet | Standards‑based | NZECP 36 / EEA guide / AS/NZS 61000; no fixed THDi figure published | 283 Hz (Powerco, WEL); 475 and 1050 Hz (Vector); 217, 317, 492 Hz (PowerNet, ripple voltage ≤0.7 %) | ≥0.95 | Blocking chokes on PFC capacitors above 2 % of connection kVA |
Some of these standards are old (Alpine 2012, MainPower 2016, EA Networks policy 2018). Confirm the current version with the network before you order filters; we can do this for you as part of a quote.
What "8 % TDD" means for your drive. TDD is total demand distortion: harmonic current as a percentage of the installation's maximum demand current, measured at the point of common coupling. At full load it equals the drive's THDi, which is why the Canterbury standards test at full load. A plain six‑pulse drive with only a DC choke or 3 % line reactor runs at 35–50 % THDi and cannot meet an 8 % or 10 % limit. A 100 kW irrigation drive in Canterbury needs a passive harmonic filter, a low‑harmonic (active front end) drive, or an active filter — and the filter has to be shown not to sink or amplify the local ripple‑control frequency.
9. Harmonic mitigation options
Typical current distortion at the drive terminals, at full load, from ABB, Danfoss and Power Electronics NZ technical guides. Figures are indicative; the lines company will want the manufacturer's spectrum for the specific model and then a site test.
| Configuration | Typical THDi at full load | Meets 10 % rural / 8 % TDD? | Notes |
|---|---|---|---|
| Six‑pulse drive, no reactor or choke | 80–120 % | No | Never connect above 20 kW without mitigation |
| Six‑pulse with 3–5 % AC line reactor or DC bus choke (standard on most drives over ~15 kW) | 35–50 % | No | Cheap and always worth having; halves the problem but not enough on its own |
| 12‑pulse (phase‑shift transformer) | 10–12 % | Marginal | Bulky; rarely economic for a single pump |
| Passive tuned/broadband harmonic filter (e.g. Danfoss AHF 010 / AHF 005 class) | 5–10 % | Yes, at full load | THDi rises at part load (about 7–12 % at 40 %); produces leading power factor when lightly loaded, which Alpine and MainPower specifically prohibit if "unreasonable"; must be checked against the 283/317 Hz ripple frequency |
| Low‑harmonic drive / active front end (AFE) | 3–5 % | Yes, all loads | Unity power factor across the range; no ripple‑signal interaction; higher purchase price and more losses. Used on the Terrace Water scheme in Tarras to satisfy Aurora |
| Active harmonic filter (shared, at the switchboard) | 2–5 % | Yes | One unit can clean up several drives; sized in amps of harmonic current |
10. Getting a large drive connected: the sequence
- Before you order — tell us the network, the pump kW, submersible or surface, the transformer size and whether other drives share the connection. We will pull the current connection standard and quote the mitigation that fits it, with the manufacturer's harmonic spectrum (Alpine "Form 1" or equivalent).
- Apply to the lines company — most require notification or an application for any non‑linear load over 20 kW, and starting‑current approval for any three‑phase motor over 4 kW. Your electrician normally lodges this; we supply the technical data.
- Ripple control and load control — irrigation over 20 kW goes on a controlled tariff with a ripple relay (283 Hz Decabit on EA Networks, MainPower, Powerco and WEL; 317 Hz on Alpine and Central Otago; 175/317 Hz on Orion). The drive needs a remote enable input wired to that relay, and any filter or capacitor must be shown not to attenuate the signal.
- Power factor — target ≥0.95 true power factor; Orion wants 0.98 on submersibles over 20 kW. An AFE drive does this inherently; a six‑pulse drive plus passive filter usually lands around 0.95–0.98 at full load but goes leading at light load.
- Commission and test — a full‑load harmonic test at the point of common coupling, recorded at 100 %, 75 % (and on Alpine 50/25/0 %) load, with background voltage distortion and unbalance noted. Alpine wants it done before the irrigation season. Keep the report with the CoC.
Home workshops and garages
Running a three‑phase lathe, mill or compressor from a single‑phase house supply.
11. Why a garage is a different job from a factory
Industrial site
- Usually its own transformer or a commercial LV feeder: IEC 61800‑3 second environment, Category C3 drives are the norm.
- Three‑phase supply available; drive input current is spread over three phases.
- RCD protection selected by the designer for the load (Type B, often 300 mA selective).
- A PCBU with machinery duties under HSWA; AS/NZS 4024 guarding and e‑stops expected.
House or lifestyle block
- Fed from the public LV network alongside neighbours: first environment. A C3 drive is "not intended for use" here; a C2 drive with its filter and screened cable is the fit.
- Typically a 60/63 A single‑phase supply for the whole house.
- AS/NZS 3000 requires 30 mA RCD protection on every domestic final subcircuit, including a dedicated drive circuit.
- Homeowner electrical work exemption does not extend to three‑phase or switchboard work.
12. Do the arithmetic on the supply first
A single‑phase‑input drive draws all its power from one phase, and its rectifier draws it at a poor input power factor. Rule of thumb for 230 V single‑phase input: roughly 5 A of input current per kW of motor at full load once efficiency and input power factor are allowed for. Manufacturer figures: a 2.2 kW single‑phase drive draws 19–27 A; a 4 kW draws about 32 A.
Our SU900‑11R0G1 (11 kW, single‑phase 220 V in, three‑phase 380 V out, 25 A output) is at the extreme end: at full 11 kW output its input current is in the order of 50–60 A, which is the entire capacity of a standard 60/63 A domestic connection. That is fine for its intended use — a dedicated supply, a lightly loaded machine tool that never sees 11 kW shaft load, or a rural connection sized for it — but it will not run an 11 kW motor flat out on an ordinary house without upgrading the connection. Check the manual's rated input current and tell your electrician before you buy. The same applies to the network: most lines companies limit single‑phase motors started direct‑on‑line to 1.5 kW; a drive is the soft‑start they want, but they may still set a current limit or ask for a three‑phase supply.
13. EMC in a residential street
RSM's rules do not forbid selling or owning a C3 drive; they require that the drive complies with IEC 61800‑3 for its declared category, and once it interferes with someone's radio or television the user is "the party responsible" and can be directed to fix or switch it off. The manufacturer's own declaration says a C3 drive is not intended for the first environment. So for a house install we recommend, and will quote:
- a drive with a Category C2 rating (built‑in or external first‑environment filter),
- screened motor cable within the length the C2 rating was tested at (often 5–10 m), screen bonded 360° at both ends,
- the drive in a metal enclosure with the control wiring segregated from the motor cable,
- the C2 warning from the manual passed on to the owner: "In a domestic environment this product may cause radio interference, in which case supplementary mitigation measures may be required."
14. Who can do the work, and what the paperwork is
Under Reg 57 and NZECP 51 a homeowner who lives in the house may, without payment, do limited work on their own 230 V installation: replace fittings, relocate switches and outlets in TPS, and run in new sub‑circuit cables — but they may not enter the back of the switchboard, may not connect the work to supply, and the finished work must be checked by a licensed electrical inspector. NZECP 51 contains no provision for motors or three‑phase work. In practice that means the new subcircuit, the RCD and MCB at the switchboard, and the drive‑to‑motor wiring are a licensed electrician's job, certified with a CoC and ESC. Keep them: WorkSafe and the EWRB both note certificates may be needed for insurance claims and when selling the house.
15. Machine safety for a lathe or mill
- A lockable supply disconnect at the machine (IEC 60204‑1 clause 5.3), rated for the motor current.
- An emergency stop that overrides everything and does not restart the machine when reset. On a drive this is a contactor ahead of the drive or a Safe Torque Off input, not a stop button wired to the drive's software stop.
- No automatic restart after a power cut or e‑stop release: disable "run on power‑up" and "auto‑restart after fault" in the drive parameters. We ship drives with these off and say so in the commissioning notes.
- If the machine's original controls are being bypassed by the drive keypad, make sure the operator still has stop and e‑stop within reach at the working position.
- Dual‑voltage motors: a 230 V three‑phase drive output needs the motor connected in delta (230 V), not star (400 V). A 400 V‑output booster drive lets you leave a 400 V star motor as is. Check the nameplate before wiring.
What we have confirmed, and what still needs checking
We would rather tell you where the evidence is thin than pretend the picture is tidy. As at September 2026:
Confirmed against the primary source
- VSDs are not on WorkSafe's declared medium‑ or high‑risk lists; SDoC applies only to declared medium‑risk articles (WorkSafe, Reg 83).
- Motor speed controllers are Level 2 EMC products and IEC/EN 61800‑3 is the listed standard (Radiocommunications (EMC Standards) Notice 2019).
- Orion: notify non‑linear loads over 20 kW; THDi under 10 % rural, under 16 % urban; 175/317 Hz ripple (NW70.00.15 Amendment 8, May 2023).
- MainPower: all VSDs over 20 kW combined; IEEE 519 TDD table; THDv 5 %/3 %; disconnection for non‑compliance (Rural Network Harmonics Standard v1.0, 2016).
- Low‑voltage tolerance widened to ±10 % from 13 November 2025 (MBIE / WorkSafe).
Still to confirm
- Whether IEC 61800‑5‑1 or IEC 60204‑1 is cited in Schedule 4 of the regulations as amended in 2025 (the legislation site could not be read directly; industry commentary says 60204‑1 is).
- EA Networks' current Rural Harmonics Standard figures (the published PDF has moved).
- The exact AS/NZS 3000:2018 clause wording on high‑leakage equipment and on VSD EMI filters (clause 7.4.7).
- Whether RSM's PIB 49 (2014) has been superseded.
This page is general technical guidance from a supplier, not legal advice. The Electricity (Safety) Regulations, WorkSafe Energy Safety, RSM and your lines company are the authorities; where this page and they differ, they win, and we would like to hear about it so we can correct the page.
Sources
- Electricity (Safety) Regulations 2010 — legislation.govt.nz (Regs 28, 31, 57, 65–67, 74A, 80–86A, Schedules 2 and 4)
- WorkSafe — Supplier Declaration of Conformity; Declared high‑risk article list; Declared medium‑risk article list; Electrical safety compliance — core requirements; Changes to Electricity Safety Regulations for electrical products (Nov 2025); Checklist for Certificates of Compliance; CoC / ESC template; NZ Electrical Codes of Practice (NZECP 36:1993, NZECP 51:2004); Doing your own electrical work; Safe use of machinery
- MBIE — Electricity (Safety) Amendment Regulations 2025 proactive release
- EWRB — What paperwork do I need to complete?; Guidance on the 2025 changes
- Radio Spectrum Management — Radiocommunications (Compliance) Notice 2020; Radiocommunications (EMC Standards) Notice 2019; Supplier compliance steps; PIB 49 Power Drive Systems — EMI and EMC; Interference
- Electricity Authority — The governance and management of harmonics in NZ's power system; Options to address a harmonics issue (2026 consultation); Code Part 8 — Common quality
- EEA — Power Quality Guidelines, January 2024
- Lines companies — Orion Network Connection Standard NW70.00.15; MainPower Rural Network Harmonics Standard and Network Connection Standards 2024; Alpine Energy Network Harmonics Standard AEL.DS 01; EA Networks connections policy, pricing policy and AMP 2026–36; Aurora Energy Network Connection Standard; Powerco 393S007; Vector ESA002; WEL Networks Connection Standard; PowerNet AM‑STD‑0002; Waipā Networks Connection Standards
- Research — University of Canterbury / EEA: harmonics from irrigation VSDs on Orion's network
- Manufacturer technical guides — ABB harmonic mitigation; ABB Technical Guide No. 6; Danfoss Clean Grid Solutions; Power Electronics NZ harmonics guide; Eaton — EMC and VFDs (IEC 61800‑3 categories); Schneider NZ — RCD type for VSDs; ABB ACS150 manual (RCD type, leakage); IEEE 519 limits summary
- Standards — AS/NZS 3820:2020; AS/NZS 3000:2018 (Amdt 1–3); IEC 61800‑5‑1:2022; IEC 61800‑3:2017; NZECP 36:1993; AS/NZS 61000.3.6; IEC 61000‑3‑12; IEEE 519‑2022; AS/NZS 4024; IEC 60204‑1