EnergySafe Magazine Winter 2018, issue 51 - Page 17

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Winter 2018 energysafe issue 51
Question Answer Standard Clause
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 .
AS / NZS 3000:2018
Section 4
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 .
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 .
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 .
AS / NZS 4777.1:2016
Clause 3.4.4
The inverter has an in-build DC isolator .
Do I need to install an additional isolator at the inverter ?
No , provided that the inverter manufacturer ensures the following .
»»
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 .
»»
The certificate with the relevant brand and model number is listed on the ERAC website .
AS / NZS 5033:2014
Clause 4.4.1.2
AS / NZS 5033:2014 Amendment 1 ( published June 2018 ) changed the requirements for the DC isolator at the inverter .
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 .
17 Winter 2018 energysafe issue 51 Question Answer Standard Clause 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. AS/NZS 3000:2018 Section 4 AS/NZS 4777.1:2016 Clause 3.4.4 AS/NZS 5033:2014 Clause 4.4.1.2 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. 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, B2r2FW6R&WV&VVG0&RBW72&WV&VVG26WBWBFRv&r'VW2FVFRVf7GW&W"7G'V7F2VVBF&RfvVBFVVBF7F6VG&&FV7Ff"6"7FF2FB&R3d"w&VFW"WfVbFRD"F( B&WV&PBFR( 26VG&&FV7F2FFF6G&FWf6RFC+ +6&FFW2VFRU07FF2BFRR6FS+ +&fFW2&FV7Ff"FRVF&PU27FF㰬+ +&fFW26Fr&FV7FFFR6V7FVBw&C@+ +&W6W'fW2FR6fWGbw&@W'6VBFRvVW&V&Ɩ2FRfW'FW"2'VBD06F"FVVBF7FFFF6F"BFRfW'FW#W26W6R2BBb22Cssr#bW2B&WV&VV@f"6VG&&FV7FF&R7FVBf"fW'FW"VW&w77FV0U2FB23d"w&VFW"&"FFR&VV6Rb22Cssr6WFV&W"#bF2v0&WV&VVB6WBWB'FRD'2'WBB2r&VVfVBFFR7FF&BFSRVVBF7F6VG&&FV7FvVR&P7FƖrWr77FVFB2VFW"3dBVV7G&67FFFB&VG26"77FVFBFW2FRFFU26RF3d"w&VFW"f"WRR7F#vd77FVF7FFFB@Vd77FV7FVBV&W"bV'2v2FRfU26P2w&VFW"F3d6VG&&FV7F2&WV&VB&fFVBFBFRfW'FW"Vf7GW&W"V7W&W2FRfvr+ +FRfW'FW"6ƖW2vFFR&WV&VVB&VFrF@frFR&6bVV7G&6&G2vFFR6fW"&VfVB+ +FRD26F"2&VV6W'FfVBF22cCr2+ +FR6W'Ff6FRvFFR&VWfB'&BBFVV&W 2Ɨ7FVBFRU$2vV'6FR22S33#BVFVBV&Ɨ6VBVR#6vVBFR&WV&VVG2f"FRD26F"BFRfW'FW"6W6RBB"v2VFVBF6VFRFFFV0bF66V7Fv6w2FRW6RbFW&D26F &fFVBFBvVFRB26F"2GW&VBfbBFR6fW"0&VfVBg&FRfW'FW"FW&R2&6bVV7G&6&G2