iet code of practice - bre booking forms/2015-04-28... · iet code of practice quality, performance...
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Part of the BRE Trust
© NSC 2015
IET Code of PracticeQuality, performance and returns
Jonny WilliamsDirector, BRE National Solar Centre
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IET Code of Practice for Grid Connected Solar PV Systems
1. What is it?
2. Progress to date?
3. How is it being adopted and who will benefit?
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How much solar do we have today in UK?
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Scope …
“This Code of Practice sets out the requirements for the design, specification,installation, commissioning, operation and maintenance of grid-connected solarphotovoltaic (PV) systems installed in the UK. The scope of this Code of Practicecovers:
• All parts of a grid-connected solar PV system up to, and including, the connection
to the AC mains.
• LV and HV connections and components.
• All scales of application, from small domestic systems to large-scale PV farms.
• Building-mounted, building-integrated and ground-mounted systems.
• Grid-connected systems with battery storage.
• Systems with an open circuit DC voltage of greater than 30VDC and less than
1,500VDC”
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IET Technical Code of Practice
IET are the organisation for electrical standards, e.g. wiring regulations
IET Standards Committee for Solar Code of Practice§ Main author: Martin Cotterell, NSC Associate
§ Committee chair: Ray Noble, NSC Associate
§ Members and Authors:
National Solar Centre, Juwi, NAPIT, BayWa, STA, BSR, Loughborough Uni, HSE, British Gas Solar, Sundog.
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Martin Cotterell§ MCS – PV & roofing working groups§ IEC - TC82 WG3 (co-convenor)§ British Standards – chair of PV committee
§ NSC - associate consultant§ Sundog Energy - founder & director
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Why a new document?
§ First PV specific document released by IET
§ Previous UK documents only went up to 50kWp
§ To align with international standard work
§ Greater technical depth
§ New technology
§ Experience
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New sections …
§ Large systems
§ HV connections
§ Grid connected systems with battery storage
§ LPS & surge protection
§ Fire
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Headline changes …
§ Array frame earthing
§ Earth fault alarm
§ String fuses
§ PV plug & sockets
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What's NOT included …
§ MCS scheme certification requirements
§ Specific energy estimate procedure
§ Wind uplift calculations
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Why do we need to change?
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• Poorly specified equipment• MC Connections• Connections in water• Isolators not water tight• Wrong inverter settings• Cable ratings – lead to tripping• Documentation• Lack of routine checking (5% of strings)• Lack of monitoring• Cable management• Poorly vented inverters
BRE National Solar Centre site investigation
EvolutionFirst edition of the “DTI Guide”
2nd Edition published
MIS3002 published - refers to PV guide
MCS PV Guide issued
IET – NSC start work on PV CoP
IET issues CoP for public comment
Working through >400 comments
2002
2006
2007
2012
2013
2014
2015
Ready soon!
2. Progress to date
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Relationship to MCS
§ MCS has shown interest in adopting for <50kW market
§ MSC may refer to IET CoP from Installers’ Standard
§ If MCS adopts, it will bring MCS inline with international standards
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Bentley Motors, Operated by Lightsource Renewable Energy
3. How to adopt and who will benefit?
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Government Estate
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Government Estate
§ To adopt the IET CoP for all installations
§ Represents a higher performance standard
§ Reduces technical risk
§ Provides independent assurance
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Approach
§ Training scheme for installers
§ Technical performance specifications
§ Installations to be assessed against the IET CoP – UKAS link
§ BRE training underway
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How others can benefit?
§ Project clients and financiers a high quality, standard process to specify
§ Gives certainty to end customer ( +1 BREEAM credit )
§ Quality mark for installers
§ Applicable to all projects
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Jonny Williams
Director, BRE NSC
@natsolarcentre
www.bre.co.uk/nsc
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