AmpSize

Show and carnival wiring checker

Show wiring RCD checks, plus site wiring depth and height.

AS/NZS 3002Electricity (Safety) Regulations 2010Data under review

Inputs

Worked example with the default inputs. The live calculator replaces it when the page loads.

Country
New Zealand
Wiring
Event wiring for the show or carnival
Method of supply
Electrical installation connection facility
Final subcircuit rating
20 A
RCD rated residual current
30 mA

Maximum rated residual current

30mA

Final subcircuit rating the clause applies to
No cap in the clause
Periodic assessment interval
1 year maximum

This result is a design aid. Verify it against the current standard.

Calculation steps

  1. Method of supplyEvent wiring fed from a connection facility (Cl 3.2.1)AS/NZS 3002:2021 Cl 3.2.1
  2. Maximum rated residual current30mAAS/NZS 3002:2021 Cl 3.2.1.2
  3. Final subcircuit rating the clause applies toThe clause sets no rating capAS/NZS 3002:2021 Cl 3.2.1.2
  4. Device the clause calls forType A minimum, to AS/NZS 61008.1, AS/NZS 61009.1 or IEC 62423AS/NZS 3002:2021 Cl 3.2.1.2
  5. Conductors the device must operate inEach live conductor, so every active and the neutralAS/NZS 3002:2021 Cl 3.2.1.2
  6. HRC fuse base, lowest IP ratingIP2X, rated with the fuse carrier taken outAS/NZS 3002:2021 Cl 2.4.2.1
  7. Connection facility enclosure, lowest IP ratingIP23 to AS 60529, with as many cables terminated as the enclosure allows, or under an equally protective coverAS/NZS 3002:2021 Cl 2.7.6.2
  8. Periodic assessment interval for a carnival or fair ground1 year maximumElectricity (Safety) Regulations 2010 reg 75(1)

Questions

Each answer describes what this tool calculates. The result is a design aid. Verify against the current standard.

What does the show and carnival tool do?

The tool reports the RCD figures AS/NZS 3002:2021 sets for installation wiring and for event wiring. On installation wiring it also checks trench depth where long pegs are expected, and aerial height. It lists the IP ratings for an HRC fuse base and a connection facility enclosure. In New Zealand it reports the regulation 75 interval.

What RCD does a carnival or event need?

Clause 2.5.1 covers installation wiring. It calls for 30 mA on final subcircuits up to 32 A. That covers circuits to socket-outlets, lighting, or direct-connected equipment with a higher shock risk. Clause 3.2.1.2 calls for 30 mA on all event wiring, at any rating. The device is Type A or better and opens every active and the neutral.

How deep must a cable be buried on a show site?

On installation wiring, Clause 2.7.4 calls for 1.0 m or more where long pegs are reasonably expected. Long means pegs or anchor stakes over 400 mm. A shallower trench needs extra mechanical protection, and the tool lists those four conditions together. Event wiring has its own clause, which AmpSize does not hold.

Why does the tool not give aerial conductor spans?

In AmpSize's copy, the columns of Table 3.1 in Clause 2.7.5.4.3 sit out of line. So AmpSize cannot match a conductor type and size to a span. It is a life safety table, so AmpSize leaves it out. Read the span from the standard.

How often is a carnival installation assessed?

In New Zealand, reg 75(1)(d) allows no more than 1 year between assessments to AS/NZS 3002. AmpSize holds pages 1 to 21 of that standard. So it does not cover the procedure in Section 4 or Appendices C and D. Australia sets its interval in a clause AmpSize does not hold.

Clauses and tables this tool reads

Every clause and table, with how each was verified

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