Compliant Design in 2015 - AS/NZS 5033 updates

AS/NZS 5033:2014 Published 6 November 2014

@glenmo Glen Morris glen@solar.org.au

Welcome •

Emergency exits and evacuation procedure

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Location of toilets

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50 CEC CPD points

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Ask questions please - be an active learner

Major changes •Change in scope with respect to the power limit •Inclusion of DC conditioning units applied at a module level •Revision of small micro inverter requirements •Requirements for PV cables, cable protection and conduit, connector requirements •New signs and commissioning requirement

d.c. conditioning units NOT micro inverters - series connected 
 d.c. units to string inverter

Strings using d.c. conditioners •

no d.c. isolator on input to d.c. condition units required if: ✴

cable length module to unit < 1.5m

✴

no extension cable

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input <350W @ STC and ELV

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multiple units may be on one package if each input <350W

PCE d.c. isolator •

If d.c. conditioning system unit is failsafe so Voc max array < d.c. Vmax input of inverter then: ✴

Voc & Isc of PV array may be considered the PCE’s maximum input ratings

✴

ie. PV array max. V = PCE max. rated V input

d.c. conditioners String cable is defined as from output of DCU

Orientation of Modules â&#x20AC;˘

PV modules in same electrically connect string within 5% incl. and azi.

â&#x20AC;˘

Unless: PV modules are connected to individual MPPT devices

Micro Inverters Clarification of the definition

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PV to micro inverter lead <1.5m

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no extension cables on d.c. input side

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may use d.c. adaptor leads to match mismatched connectors from PV module to micro inverter

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each input has separate MPPT*

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each input <350W @STC max. power rating

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multi-input micro’s <350W/MPPT input and maximum d.c. is ELV

PV module frame earthing Equipotential bonding to earth of conductive parts of the PV array, mounting frame and associated equipment (micro inverters) - 4mm2 min.

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all LV PV arrays require bonding of module frames and mounting system

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not required for ELV arrays unless micro inverter or ac modules used with LV a.c. output

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4mm2 minimum bonding conductor

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if lightning protection required then 16mm2 min.

Earthing terminal •

ac modules and micro inverters may use the inverter’s earth connection as the PV array bonding earth

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4mm2 min. size only applies to the cable from the module frame or mounting system to the earthing terminal (for mechanical durability reasons)

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only applies if d.c. input is ELV and PV power @STC per inverter is <350W

Segretation of circuits d.c. and a.c. circuits within enclosures â&#x20AC;¨ shall be segregated to IP4x

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segregation requirements are additional to AS/NZS 3000

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a.c. and d.c. segregated by insulating barrier not less than IP4X (1mm probe test)

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if on common mounting then rail must be non-conductive

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different types of circuits clearly labelled or by colour

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outside of enclosure, 50mm separation required

PV cables in buildings mechanical protection requirements

HD conduit •

required for PV d.c. cables within ceilings, wall cavities, under floors*

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does not apply to earth conductors

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< 300mm from inverter terminals not required if Voc <600V and protected from mechanical damage

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not required in non-domestic installations where other means of minimizing short circuit risk

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AS/NZS 3000 mechanical protection applies to d.c.

Restricted access PV arrays >600Voc max

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restricted by barrier such as fence, padlocked gate or locked door

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restricted by location such as a roof with no ready means of access

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>600Voc max PV array - all cables including protection and isolation devices restricted as above or by use of a tool

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Includes the PCE input plugs

General •

“adjacent” defined as within 3m and fully visible from both locations

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“domestic dwelling” is Class 1, 2, 3 or 10 as specified in NCC 2014 (ie. single dwelling; units; boarding house; shed)

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removed requirement for anodised array frame in marine environments

Labelling •

DC conduit labelled every 2m

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fire emergency sign requires Isc (STC) and Voc (max)

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where d.c. condition units the PCE’s d.c. current and voltage input max is used

Fire sign for micro inverters A.C. SOLAR ARRAY on north roof In an emergency, turn off the MAIN SWITCH INVERTER SUPPLY at back shed switchboard.

This will isolate the PV array and de-energize the PV system.

SHUTDOWN PROCEDURE Turn off MAIN SWITCH INVERTER SUPPLY Turn off PV ARRAY D.C. ISOLATOR WARNING WARNING PV ARRAY D.C. ISOLATORS PV ARRAY D.C. ISOLATORS NOT DE-ENERGIZE DO NOT DO DE-ENERGIZE THE PV THE PVAND ARRAY ANDCABLES ARRAY CABLES ARRAY ARRAY

“Thank you.”

voltage ratings

d.c. switch-disconnectors connected to â&#x20AC;¨ separated and non-separated inverters