13.4 Construction Sites, Appliance Testing & Special Installations

13.4 Construction Sites, Appliance Testing & Special Installations

Not every installation is a quiet domestic switchboard. Construction sites, hired tools, second-hand gear, hospitals, marinas, caravans, hazardous areas, and solar inverters each pull companion standards. On the regulations prescription these are often C- or B-level awareness items: know when they apply, what risk they address, and how Schedule 2 points you there—not every clause of every specialty book.

AS/NZS 3012 — construction and demolition sites

AS/NZS 3012 addresses electrical installations associated with construction and demolition sites. Exam themes (confirm details in the current standard when permitted):

Do not answer a construction site temporary supply stem with domestic final-subcircuit folklore alone. Open the 3012 conceptual frame: temporary, protected, inspected, RCD-aware. C-level ranking still means recognition and navigation, especially when ESR/Schedule 2 or high-risk PEW context appears.

Exam contrast:

• Permanent dwelling rewire → AS/NZS 3000 (+ ESR certification).
• Builder’s temporary site board and construction power → 3012 themes layered on 3000 principles.
• Worker’s portable tools on that site → also 3760 in-service testing awareness.

AS/NZS 3760 — in-service inspection and testing of electrical equipment

AS/NZS 3760 is the familiar “test and tag” family standard for in-service safety inspection and testing of electrical equipment (portable/appliances and similar equipment as scoped). Prescription level: B awareness for regulations exam purposes.

Core concepts:

1. Visual inspection first — damage, flexes, plugs, guards, suitability for environment.
2. Electrical tests as applicable (e.g. earth continuity on Class I, insulation resistance concepts)—use the standard’s methods and limits, not improvised multimeter folklore.
3. Tagging after test — durable tag showing identity/status/date (and related info the standard/site system requires) so users know equipment was checked.
4. Retest intervals — environment and equipment class drive frequency (construction/hostile environments retest more often than benign offices—use current tables, do not invent intervals from memory in calculation-style stems).

3760 is equipment in service, not a substitute for AS/NZS 3000 verification of fixed installations. Mixing “tag the house wiring” with “tag the drill” is a classic category error.

Regulation 90: Testing Appliances After Work

Before the in-service testing regime, know the duty that sits directly on you whenever an appliance passes through your hands. Regulation 90(1) applies if you have done any prescribed electrical work on an appliance, or any work on it that may affect its electrical safety. Before releasing it from your control, regulation 90(2) requires you to test it and then either:

(a) confirm it is electrically safe in accordance with —

(b) or, if the appliance is electrically unsafe, adequately disable and mark it. Regulation 90(3) deems you to comply with (b) if you disable and mark the appliance in accordance with AS/NZS 4701. Failing to comply with regulation 90(2) is an offence carrying a level 2 penalty (reg 90(4)).

The EWRB prescription names this explicitly: following repairs, electrical appliances must be tested to ensure they are safe in accordance with AS/NZS 5762 (regulation 90(2)). The exam trap is answering with AS/NZS 3760 for a repaired appliance — 3760 is the in-service regime for equipment already in use, while 5762 is the post-repair regime and 5761 covers second-hand equipment prior to sale. A related duty sits in regulation 79 for the maintenance of domestic appliances.

AS/NZS 5761 / 5762 — second-hand and repaired equipment

Both are B-level primary references on the regulations prescription, and Schedule 2 gives their full titles:

Contrast them with AS/NZS 3760, which is the in-service regime for equipment already in use, and with AS/NZS 4701, which covers requirements for domestic electrical appliances and equipment for reconditioning or parts recycling and supplies the disable-and-mark route under reg 90(3).

Exam use: if a stem involves used or repaired appliances re-entering service, the answer path is test to the applicable equipment standard before release, not “it powered up once so it is fine.” Connect also to NZECP 50 owner-repair boundaries (section 12.2): owner limited repair does not mean untested gear.

Special installations overview

Special locations and systems have dedicated standards. Treat this as a recognition map:

High-risk PEW and inspectors: many specialty systems (and other categories defined in ESR) are high-risk prescribed electrical work requiring electrical inspection before connection (Chapter 4–5). When a stem names a hospital cardiac-protected area, marina pedestal supply, hazardous zone, or grid-tied inverter installation, ask:

1. Is this ordinary 3000-only domestic work?
2. Which companion standard applies?
3. Does ESR treat the work as high-risk needing an inspector / RoI?
4. What certification documents close the chain?

Wrong answer pattern: applying only “30 mA RCD on sockets” domestic intuition to patient areas or Ex equipment selection.

Tie back to Schedule 2 navigation

ESR Schedule 2 is the regulatory index that links installation types and topics to standards deemed appropriate (Chapter 12.4). Exam method:

1. Classify the installation / equipment situation.
2. Open Schedule 2 (or recall the map) to the companion standard.
3. Apply that standard’s principles with AS/NZS 3000 and ESR duties.
4. Layer PEW risk + certification + inspection.

Common traps

• Treating construction power as permanent domestic wiring only.
• Confusing fixed installation verification with 3760 appliance tagging.
• Ignoring retest/tag after repair.
• Specialty location answered with generic socket rules only.
• Forgetting inspector pathway on high-risk specialty PEW.
• Never looking at Schedule 2 when the stem screams “companion standard.”

Study drill

For each stem, name the environment (site, appliance, specialty location), the companion ID, and whether high-risk inspection is likely. If you cannot name the companion, start at Schedule 2—not at random AS/NZS 3000 clause hunting.