IET Code of Practice - Amazon Web Services · IET Technical Code of Practice IET are the...
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Part of the BRE Trust
© NSC 2015
IET Code of PracticeQuality, performance and returns
Jonny WilliamsDirector, BRE National Solar Centre
#brelive@natsolarcentre
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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Scope …
“This Code of Practice sets out the requirements for the design, specification,
installation, commissioning, operation and maintenance of grid-connected solar
photovoltaic (PV) systems installed in the UK. The scope of this Code of Practice
covers:
•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 CotterellMartin 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
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Photos from “The Argus”
Tues 20 April 2015.
“Electrical fault with a
solar panel believed to
have caused fire at Hove
Town Hall”
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
�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
#brelive@natsolarcentre