I am installing a split system air-conditioner . Can I take the supply for the split system from a nearby power circuit ? |
The first thing that needs to be considered is the manufacturer ’ s instructions .
Section 4 of the 2018 Wiring Rules set out that electrical equipment shall be selected and installed in accordance with the requirements as specified in the manufacturer ’ s instructions .
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AS / NZS 3000:2018 |
Section 4 |
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If the manufacturer specifies that the air-conditioning system shall be connected on a dedicated circuit or connected with specific size cable or specific size CB , and as long as these requirements are not less any requirements set out in the Wiring Rules , then the manufacturer instructions need to be followed . |
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Do I need to install central protection for solar installations that are 30kVA or greater ( even if the DB don ’ t require it )?
Note – Central protection is an additional control device that : »» coordinates multiple IES installations at the one site ; »» provides protection for the entire IES installation ; »» provides islanding protection to the connected grid ; and »» preserves the safety of grid personnel and the general public .
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Yes . Clause 3.4.4 of AS / NZS 4777.1:2016 makes it a requirement for central protection to be installed for any Inverter Energy Systems ( IES ) that is 30kVA or greater .
Prior to the release of AS / NZS 4777.1 in September 2016 , this was a requirement set out by the DBs , but it has now been moved into the standard .
Note : You may need to install central protection when you are installing a new system that is under 30kVA at an electrical installation that already has a solar system that takes the total IES size to 30kVA or greater .
For example , you install a 27kVA system to an installation that had a 5kVA system installed a number of years ago . As the final IES size is greater than 30kVA central protection is required .
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AS / NZS 4777.1:2016 |
Clause 3.4.4 |
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The inverter has an in-build DC isolator .
Do I need to install an additional isolator at the inverter ?
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No , provided that the inverter manufacturer ensures the following .
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The inverter complies with the requirement relating to not having the risk of electrical hazards with the cover removed . »»
The DC isolator has been certified to AS / NZS 60947.3 .
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The certificate with the relevant brand and model number is listed on the ERAC website .
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AS / NZS 5033:2014 |
Clause 4.4.1.2 |
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AS / NZS 5033:2014 Amendment 1 ( published June 2018 ) changed the requirements for the DC isolator at the inverter . |
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Clause 4.4.1.2 was amended to include an additional means of disconnection which allows the use of an internal DC isolator provided that when the d . c . isolator is turned off and the cover is removed from the inverter there is no risk of electrical hazards . |