Ar C.J. Walsh – Registered Architect, Fire Engineer & Independent Technical Controller …… International Expert on Accessibility for All (including Fire Safety) + Sustainability
2020-09-22: Adopted at the International Fire Conference: SFE 2016 DUBLIN (www.sfe-fire.eu) …
Many years have passed since the 1972 UN Stockholm Declaration on the Human Environment and the 1992 Rio Declaration on Environment and Development. In 2016, Sustainable Development remains an intricate, open, dynamic and continually evolving concept. The guide and driver for frontline practitioners, policy and decision makers must be a personal Code of Ethics … an integrated and inter-related whole which cannot be reduced to fixed rules inviting game playing and ‘trade-offs’. After working with this Code, it may be necessary to expand on and discuss its principles and/or some of the issues raised … not to narrow its focus, but to broaden interpretation.
The realization of a Safe, Inclusive, Resilient & Sustainable Built Environment demands a concerted, collaborative, very creative and widely trans-disciplinary effort at national, local, regional and international levels across the whole planet – Our Common Home. The informed operation of appropriate legislation, administrative procedures, performance monitoring and targeting, and incentives/disincentives, at all of these levels, will facilitate initial progress towards this objective … but not the quantity, quality or speed of progress necessary. Our time is running out !
This Code of Ethics applies … for those who subscribe to its values … to policy and decision makers, and the many different individuals and organizations directly and indirectly involved in the design, engineering, construction, and operation (management and maintenance) of a Safe, Resilient & Sustainable Built Environment for ALL.
The Purpose of this Code of Ethics is to guide the work of competent individuals and organizations in a context where incomplete or inadequate legislation, administrative procedures and incentives/disincentives exist … but, more importantly, where they do not exist at all … and, amid much confusion and obfuscation of the terms, to ensure that implementation is authentically ‘sustainable’, and reliably ‘safe’ and ‘resilient’ for every person in the receiving community, society or culture … before it is too late !
2019 City West Summits, Dublin – Colour photograph showing the view over the Exhibition Hall. Click to enlarge.
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I was very pleased to make a Presentation at both events, adapted to suit an Irish context, on … ‘Sustainable Fire Engineering – Necessary Professional Transformation For The 21st Century’ … which continues to evolve.
Sustainable Fire Engineering: The creative, person-centred and ethical Fire Engineering response, in resilient built form and smart systems, to the concept of Sustainable Human and Social Development … the many aspects of which must receive synchronous and balanced consideration !
Sustainable Fire Engineering Internet: www.sfe-fire.eu Twitter: @sfe2016dublin
Presentation Abstract
Annual Fire Losses, both direct and indirect, amount to a very significant percentage of Gross Domestic Product (#GDP) in all economies, whether they are rich or poor … and result in enormous environmental devastation and social disruption. Some losses have not yet been fully identified, e.g. environmental impact … while others are not yet capable of being fully quantified, e.g. business interruption, brand and reputation damage. Globally, fire statistics still remain unreliable. In all cases, however, the waste of valuable human and natural resources caused by preventable fires is unsustainable and no longer acceptable.
From an entirely different perspective … Sustainable Buildings are presenting every society with an innovative and exciting re-interpretation of how a building functions in response to critical energy, environmental, climate change and planetary capacity pressures … an approach which has left the International Fire Engineering and Firefighting Communities far behind in its wake, struggling to develop the necessary ‘creative’ and ‘sustainable’ fire safety strategies.
The Aim of Sustainable Fire Engineering (#SFE) is to dramatically reduce direct and indirect fire losses in the Human Environment (including the social, built, economic, virtual, and institutional environments) … to protect the Natural Environment … and, within buildings, to ensure that there is an effective level of Fire Safety for All Occupants, not just for Some, over the full building life cycle.
The following Priority Themes for SFE lie outside, or beyond, the constrained and limited fire safety objectives of current fire regulations, codes and standards – objectives which do not properly protect society, a fire engineer’s clients, or the facility manager’s organization:
Fire Safety for ALL, not just for Some. Nobody left behind !
Firefighter Safety. Everyone goes home ! It is easy to dramatically improve firefighter safety with building design. So, why haven’t NIST’s 2005 and 2008 WTC 9-11 Critical Recommendations been properly implemented anywhere ?
Property Protection. Fire damage and post-fire reconstruction/refurbishment are a huge waste of resources. On the other hand, protection of an organization’s image/brand/reputation is important … and business continuity is essential. Heritage fire losses can never be replaced.
Environmental Impact. Prevention of a fire is far better than any cure ! But prevention must also begin by specifying ‘clean’ technologies and products. Low Pressure Water Mist Systems are not only person/environment-friendly and resource efficient … they are absolutely essential in airtight and hyper energy-efficient building types (e.g. LEED, PassivHaus, BREEAM) in order to achieve an effective level of fire safety for all occupants, and firefighters. [ Note: Environmental Impact Assessment (#EIA) has been superseded by Sustainability Impact Assessment (#SIA).]
Building Innovation, People and Their Interaction. Fire engineers and firefighters must begin to understand today’s new design strategies.
Sustainable Design and Engineering. Wake up and smell the coffee ! Legislation can only achieve so much. Spatial planners, building designers and fire engineers must subscribe to a robust Code of Ethics * which is fit for purpose in the Human Environment of the 21st Century.
Sustainable Fire Engineering Solutions are …
Adapted to a local context, i.e. climate change/variability/extremes, social need, geography, economy, and culture, etc ;
Reliability-based – lessons from real extreme and hybrid events, e.g. 2001 WTC 9-11 Attack, 2008 Mumbai/2015 Paris/2016 Brussels Hive Attacks and the 2011 Fukushima Nuclear Incident, are applied to frontline practice ;
Person-centred – real people are placed at the centre of creative endeavours and due consideration is given to their responsible needs, and their health, safety, welfare and security in the Human Environment ;
Resilient – functioning must be reliable during normal conditions, and include the ability to withstand, adapt to and absorb unusual disturbance, disruption or damage, and thereafter to quickly return to an enhanced state of function.
The creative, person-centred and ethical fire engineering response – in resilient built or wrought form, and using smart systems – to the intricate, open, dynamic and continually evolving concept of Sustainable Human & Social Development … the many aspects of which must receive balanced and synchronous consideration.
SFE PRIORITY THEMES
1. Fire Safety for ALL – Not Just for SOME People. Nobody Left Behind !
Do Building Designers and Fire Engineers have any understanding of what it feels like to be left behind in a fire emergency … perhaps to die ?
Do Building Designers and Fire Engineers have any understanding of the ‘real’ people who use their buildings … or their ‘real’ needs ?
2. Firefighter Safety – It’s So Easy to Dramatically Improve Their Safety At A Fire Scene ! A Firefighter’s Protective Clothing and Equipment are not enough !
Conscious awareness of this issue by Building Designers and Fire Engineers is required … and appropriate education/training.
3. Property Protection – A Minor Code Fire Safety Objective, Insofar As It Is Necessary to Protect the Safety of Building Users … Only !
Fire damage and post-fire reconstruction/refurbishment are a huge waste of resources. On the other hand, protection of an organization’s image/brand is important … and business continuity is essential.
Heritage Fire Losses cannot be replaced !
To properly protect Society and the interests of a Client/Client Organization … Building Designers and Fire Engineers are ethically bound to clearly explain the limitations of Code and Standard Fire Safety Objectives to their Client/Client Organization.
4. Environmental Impact – Prevention Is Far, Far Better Than Cure. Instead of resisting, and erecting ‘professional’ barriers … Spatial Planners, Building Designers and Fire Engineers must begin to properly understand this concept … and act ethically to defend and protect the environment !
Environmental Impact: Any effect caused by a given activity on the environment, including human health, safety and welfare, flora, fauna, soil, air, water, and especially representative samples of natural ecosystems, climate, landscape and historical monuments or other physical structures, or the interactions among these factors ; it also includes effects on accessibility, cultural heritage or socio-economic conditions resulting from alterations to those factors.
This Planet – Our Common Home – can no longer suffer the scale and extent of total devastation seen after the 2015 Tianjin (China) Regional Fire Disaster !
5. Building Innovation, People and Their Interaction – Fire Engineers and Firefighters must understand current approaches to more sustainable building design, the ‘real’ people who use the built environment, and the complex interactions between both.
People with Activity Limitations (E) / Personnes à Performances Réduites (F): Those people, of all ages, who are unable to perform, independently and without aid, basic human activities or tasks – because of a health condition or physical/mental/cognitive/psychological impairment of a permanent or temporary nature.
The above Term, in English and French, includes …
people who experience difficulty in walking, with or without a facilitation aid, e.g. stick, crutch, calliper or walking frame ;
wheelchair users ;
the very young (people under 5 years of age), frail older people, and women in the later stages of pregnancy ;
people who are visually and/or hearing impaired ;
people who suffer from arthritis, asthma, or a heart condition … or any partial or complete loss of language related abilities, i.e. aphasia … or who have a cognitive impairment disorder, including dementia, amnesia, brain injury, or delirium ;
people impaired after the use of alcohol, other ‘social’ drugs e.g. cocaine and heroin, and some medicines … or following exposure to environmental pollution and/or other irresponsible human activity, e.g. war or terrorism ;
people who experience a panic attack in a real fire situation or other emergency ;
people, including firefighters, who suffer incapacitation as a result of exposure, during a real fire, to smoke and poisonous/toxic substances and/or elevated temperatures.
6. Sustainable Design & Engineering – Get With The Programme ! The extensive United Nations 2030 Sustainable Development Framework Agenda was overwhelmingly agreed and adopted in 2015.
Sustainability Impact Assessment (SIA): A continual evaluation and optimization process – informing initial decision-making, design, shaping activity/product/service realization, useful life, and termination or final disposal – of the interrelated positive and negative social, environmental, economic, institutional, political and legal impacts on balanced and equitable implementation of Sustainable Human & Social Development.
‘Carrots and Sticks’ can only achieve so much. Spatial Planners, Building Designers and Fire Engineers must – individually and as a group – subscribe to a robust Code of Ethics which is fit for purpose in today’s Human Environment.
New CIB W14: ‘Fire Safety’ Research Working Group VI Reflection Document: ‘Sustainable Fire Engineering Design, Construction & Operation’, which will establish a framework for the future development of Sustainable Fire Engineering.
Preparation of this Document will soon begin, and the following issues will be explored:
Conceptual Framework for Sustainable Fire Engineering (SFE), with a necessary accompanying Generic SFE Terminology ;
Strategy for Future SFE Development ;
Implementation of 2005 & 2008 NIST WTC 9-11 Recommendations ;
Fresh, New SFE Research Agenda ;
Resilient Implementation of SFE Research Agenda.
Would you like to get involved, and help with this work ?
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PRIORITY THEME 1 – FIRE SAFETY FOR ALL (2017)
The Fire Safety Task Group, chaired by CJ Walsh, of ISO Technical Committee 59, Sub-Committee 16, Working Group 1, has already commenced the revision and further development of the fire safety texts in International Standard ISO 21542 (2011): ‘Building Construction – Accessibility & Usability of the Built Environment’.
The main effort, initially, has been focused on developing a coherent Fire Safety for All approach … token consideration, or a post-design graft-on, of the fire safety needs of people with activity limitations do not work, and are unacceptable.
‘ The creative, person-centred and ethical Fire Engineering response, in resilient built form and smart systems, to the concept of Sustainable Human and Social Development – the many aspects of which must receive balanced and synchronous consideration.’
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Organized by FireOx International (Ireland, Italy & Turkey), in joint collaboration with Glasgow Caledonian University’s School of Engineering & Built Environment (Scotland) … and having a widely multi-disciplinary attendance from the U.S.A., Hong Kong SAR (China), Spain, Finland, Scotland, Norway, Germany, England, The Netherlands and Ireland … SFE 2016 DUBLIN was a unique, and very successful, two-day gathering within the International Fire Engineering and Fire Service Communities.
SUSTAINABLE FIRE ENGINEERING fulfils a Critical Role in the realization of a Safe, Resilient and Sustainable Built Environment 4 ALL !
SUSTAINABLE FIRE ENGINEERING facilitates Positive Progress in implementing the United Nation’s 2030 Sustainable Development Agenda, which incorporates 17 Sustainable Development Goals and 169 Performance Targets !
SUSTAINABLE FIRE ENGINEERING fast-tracks Proper Compliance with the 7 Basic Performance Requirements – functional, fully integrated and indivisible – in Annex I of European Union Construction Products Regulation 305/2011 !
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A NECESSARY & LONG OVERDUE TRANSFORMATION !
A Building is a permanent construction, complying with basic performance requirements and capable of being easily adapted … comprising structure, essential electronic, information and communication technologies (EICT’s), and fabric (non-structure) … having a minimum life cycle of 100 years … and providing habitable, functional and flexible interior spaces for people to use.
Building Users have a wide and varied range of abilities and behaviours … some having discernible health conditions and/or physical, mental, cognitive, psychological impairments … while others, e.g. young children, women in the later stages of pregnancy and frail older people, are also particularly vulnerable in user-hostile, inaccessible environments. Not everyone will self-identify as having an activity limitation because of the high level of social stigma associated with ‘disability’. Building designers and fire engineers must accept that building users have rights and responsible needs ; the real individual and group fire safety requirements of vulnerable building users must be given proper consideration by both design disciplines, working collaboratively together.
Real Building Users have a wide and varied range of abilities … and during a Fire Evacuation, they will NOT behave like ‘marbles or liquid in a computer model’ ! People with Disabilities, on their own, account for approximately 20% of populations in developed countries … more in developing and the least developed countries.
Following the savage 2008 Mumbai Hive Attack in India, and the more recent 2015 and 2016 Attacks in Europe, i.e. Paris, Brussels, Istanbul and Berlin … it is entirely wrong to assume that the main and/or only targets will be specific high-risk buildings types, i.e. Tall/High-Rise, Iconic, Innovative and Critical Function Buildings (refer to 2005 & 2008 NIST WTC 9-11 Recommendations). All buildings and adjoining/adjacent public spaces must be carefully assessed for the risk of direct or collateral involvement in an Extreme Man-Made Event.
It is a fundamental principle of reliable and resilient structural engineering that horizontal and vertical structural members/elements of construction are robustly connected together. All buildings must, therefore, be capable of resisting Disproportionate Damage. The restriction of this requirement, within some jurisdictions, to buildings of more than five storeys in height is purely arbitrary, cannot be substantiated technically … and ethically, must be disregarded.
Fire-Induced Progressive Damage is distinguished from Disproportionate Damage – a related but different structural concept – by the mode of damage initiation, not the final condition of building failure. This phenomenon is poorly understood. But, unless it is impeded, or resisted, by building design … Fire-Induced Progressive Damage will result in Disproportionate Damage … and may lead to a Collapse Level Event (CLE), which is entirely unacceptable to the general population of any community or society. All buildings must, therefore, be capable of resisting Fire-Induced Progressive Damage.
All buildings must also be carefully assessed for the risk of involvement in a Severe Natural Event, e.g. earthquakes, floods, landslides, typhoons and tsunamis.
In all of the above Risk Assessments … the minimum Return Period (also known as Recurrence Interval or Repeat Interval) must never be less than 100 years.
Reacting to surging energy, environmental and planetary capacity pressures … with accelerating climate change … Sustainable Buildings are now presenting society with an innovative and exciting re-interpretation of how a building is designed, constructed and functions … an approach which is leaving the International Fire Engineering and Fire Service Communities far behind in its wake, struggling to keep up.
Colour ‘infographic’ showing the design features of 1 Bligh Street, Sydney CBD, Australia … ‘tall’/skyscraper commercial office building, completed in 2011 … designed by Ingenhoven Architects (Germany) and Architectus (Australia). Can Fire Engineers understand this new design approach … and then collaborate, actively and creatively, within the Project Design Team ?Black and white plan drawing of 1 Bligh Street (Level 26), Sydney CBD, Australia … a ‘sustainable’ office building … BUT … Effective ‘Fire Safety for All’ in this building ? Has Firefighter Safety been considered ?? Property Protection ??? Business Continuity ???? The very harmful Environmental Impacts of Fire ?????
Passive and Active Fire Protection Measures, together with Building Management Systems (whether human and/or intelligent), are never 100% reliable. Society must depend, therefore, on firefighters to fill this reliability ‘gap’ … and to enter buildings on fire in order to search for remaining or trapped building users. This is in addition to their regular firefighting function. Therefore, there is a strong ethical obligation on building designers, including fire engineers, to properly consider Firefighter Safety … should a fire incident occur at any time during the life cycle of a building.
Structural Serviceability, Fire Resistance Performance and ‘Fire Safety for All’ in a building must, therefore, be related directly to the local Fire Service Support Infrastructure … particularly in developing and the least developed countries. AND … Fire Codes and Standards must always be adapted to a local context !
Colour photograph showing knotted sheets hanging from high-level windows which were used for ‘escape’ by guests … clearly indicating a catastrophic failure of fire protection measures and management within the building. Fire and smoke spread quickly throughout the multi-storey hotel, resulting in 12 dead, and over 100 injured (approximately 1/3 critically).Colour photograph showing a guest rescue by ladder. Notice the condition of the ladder and firefighter protection. Fire safety in a building must be related directly to local Fire Service Support Infrastructure … particularly in developing and the least developed countries.
The fire safety objectives of current Fire Codes and Standards are limited, usually flawed … and will rarely satisfy the real needs of clients/client organizations, or properly protect society. Fire code compliance, in isolation from other aspects of building performance, will involve a consideration of only a fraction of the issues discussed above. There is once again, therefore, a strong ethical obligation on building designers, including fire engineers, to clearly differentiate between the limited fire safety objectives in Fire Codes and Standards … and Project-Specific Fire Engineering Design Objectives … and to explain these differences to a Client/Client Organization. Facility Managers must also explain these differences directly to an Organization’s Senior Management … and directly inform the Organization’s Board of Directors … as appropriate.SFE Mission: To ensure that there is an effective level of Fire Safety for ALL – not just for SOME – in the Built Environment … to dramatically reduce all direct and indirect fire losses in the Human Environment … and to protect the Natural Environment.
To transform Conventional Fire Engineering, as practiced today, into an ethical and fully professional Sustainable Design Discipline which is fit for purpose in the 21st Century … meaning … that fire engineers can participate actively and collaboratively in the sustainable design process, and can respond creatively with sustainable fire engineering design solutions which result in Effective Fire Safety for All in a Safe, Resilient and Sustainable Built Environment.
To bring together today’s disparate sectors within the International Fire Engineering (and Science) Community … to encourage better communication between each, and trans-disciplinary collaboration between all.
To initiate discussion and foster mutual understanding between the International Sustainable Development, Climate Change and Urban Resilience Communities … and the International Fire Engineering and Fire Service Communities.
The realization of a Safe, Inclusive, Resilient & Sustainable Built Environment demands a concerted, collaborative, very creative and widely trans-disciplinary effort at national, local, regional and international levels across the whole planet – Our Common Home. The informed operation of appropriate legislation, administrative procedures, performance monitoring and targeting, and incentives/disincentives, at all of these levels, will facilitate initial progress towards this objective … but not the quantity, quality or speed of progress necessary. Our time is running out !
This Code of Ethics applies … for those who subscribe to its values … to policy and decision makers, and the many different individuals and organizations directly and indirectly involved in the design, engineering, construction, and operation (management and maintenance) of a Safe, Resilient & Sustainable Built Environment for All.
The Purpose of this Code of Ethics is to guide the work of competent individuals and organizations in a context where incomplete or inadequate legislation, administrative procedures and incentives/disincentives exist … but, more importantly, where they do not exist at all … and, amid much confusion and obfuscation of the terms, to ensure that implementation is authentically ‘sustainable’, and reliably ‘safe’ and ‘resilient’ for every person in the receiving community, society or culture … before it is too late !
2.Sustainable Fire Engineering Network … Join the LinkedIn SFE Group at https://www.linkedin.com/groups/8390667. Interested Individuals and Organizations are all very welcome.
3. New CIB W14: ‘Fire Safety’ Research Working Group VI Reflection Document: ‘Sustainable Fire Engineering Design, Construction & Operation’, which will establish a framework for the future development of Sustainable Fire Engineering.
Preparation of this Document will soon begin, and the following issues will be explored:
Conceptual Framework for Sustainable Fire Engineering (SFE), with a necessary accompanying Generic SFE Terminology ;
Strategy for Future SFE Development ;
Implementation of 2005 & 2008 NIST WTC 9-11 Recommendations ;
2016-09-14: Only now are we really catching up with the extremely serious matter of Fire Safety in Sustainable Buildings … serious for building occupants … and firefighters !
‘ In order to achieve sustainable development, environmental protection and energy efficiency/conservation shall constitute integral parts of the development process, and shall not be considered in isolation.’
2016 Dublin Code of Ethics: Design, Engineering, Construction & Operation of a Safe, Resilient & Sustainable Built Environment for All ( www.sfe-fire.eu )
The Performance Target for New Construction must be Positive Energy Buildings.
So … we will see more and more Solar Photovoltaic Panels installed on more and more buildings … in every country. Certainly not less ! And, let’s face it, many will not be properly approved, i.e. shown to be ‘fit for their intended use’ …
Colour photograph showing a house fire caused by Solar Photovoltaic Roof Panels.
At the beginning of this decade, a Fire Research Project was carried out by the Underwriters Laboratories Firefighter Research Institute in the USA … and it addressed the issue of firefighter vulnerability to electrical hazards, and serious injury, when fighting a fire involving Solar Photovoltaic (PV) Modules and Support Systems installed on buildings.
Colour photograph showing two firefighters on a roof, one with cutting equipment. Solar Photovoltaic Roof Panels restrict firefighter access to building interior roof spaces.
The Total Global Solar Energy Capacity averaged 40 % annual growth from 2000 to 2010 (source: International Energy Agency). In the USA, Grid-Connected Solar Photovoltaic Capacity grew 50 % per year for much of that time (source: US Federal Energy Regulatory Commission). These trends increase the potential of a Fire Service Response to a building having a Photovoltaic Installation, irrespective of the PV being involved with the initiation of the fire event. As a result, conventional firefighter tactics for suppression, ventilation and overhaul have been complicated, leaving firefighters vulnerable to potentially unrecognized exposure. Though the electrical and fire hazards associated with electrical generation and distribution systems are well known, PV Systems present unique safety concerns. A limited body of knowledge and insufficient data exist to understand these risks … to the extent that Fire Services have been unable to develop safety solutions and respond in a safe manner.
This Fire Research Project developed the empirical data needed to quantify the hazards associated with PV Installations … and provided the foundation to modify current or develop new firefighting practices to reduce firefighter deaths and injury.
Colour photograph showing a large array of Solar Photovoltaic Panels on a roof. Extra loading on roof structures must be considered, as well as possible interference with roof fire evacuation routes for able-bodied occupants.
The Tactical Considerations addressed during the Project include:
Shock hazard due to the presence of water and PV power during fire suppression activities ;
Shock hazard due to the direct contact with energized components during firefighting operations ;
Emergency disconnect and disruption techniques ;
Severing of conductors ;
Assessment of PV power during low ambient light, artificial light and light from a fire ;
Assessment of potential shock hazard from damaged PV Modules and Systems.
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Office of California’s State Fire Marshal – November 2010
UL Report (2011): The Following Summarizes the Findings of This Fire Research Project:
The electric shock hazard due to the application of water is dependent on voltage, water conductivity, distance and spray pattern. A slight adjustment from a solid fire hose stream towards a fog pattern (10 degree cone angle) reduced measured current below perception level. Salt water should not be used on live electrical equipment. A distance of 6 m has been determined to reduce potential shock hazard from a 1000 VDC source to a level below 2 mA, considered as safe. It should be noted that pooled water or foam may become energized due to damage in the PV System.
Outdoor weather exposure-rated electrical enclosures are not resistant to water penetration by fire hose streams. A typical enclosure will collect water and present an electrical hazard.
Firefighters’ gloves and boots afford limited protection against electrical shock provided the insulating surface is intact and dry. They should not be considered equivalent to Electrical Personal Protective Equipment (PPE).
Turning off an array is not as simple as opening a disconnect switch. Depending on the individual system, there may be multiple circuits wired together to a common point such as a combiner box. All circuits supplying power to this point must be interrupted to partially de-energize the system. As long as the array is illuminated, parts of the system will remain energized. Unlike a typical electrical or gas utility … on a PV Array, there is no single point of disconnect.
Tarps offer varying degrees of effectiveness to interrupt the generation of power from a PV Array, independent of cost. Heavy, densely woven fabric and dark plastic films reduce the power from PV to nearly zero. As a general guide, if light can be seen through a tarp, it should not be used. Caution should be exercised during the deployment of tarps on damaged equipment, as a wet tarp may become energized and conduct hazardous current if it contacts live equipment. Also, firefighting foam should not be relied upon to block light.
When illuminated by artificial light sources, such as Fire Department light trucks or an exposure fire, PV Systems are capable of producing electrical power sufficient to cause a lock-on hazard.
Severely damaged PV Arrays are capable of producing hazardous conditions ranging from perception to electrocution. Damage to the array may result in the creation of new and unexpected circuit paths. These paths may include both array components (module frame, mounting racks, conduits, etc) and building components (metal roofs, flashings and gutters). Care must be exercised during all operations, both interior and exterior. Contacting a local professional PV Installation Company should be considered to mitigate potential hazards.
Damage to modules from tools may result in both electrical and fire hazards. The hazard may occur at the point of damage or at other locations depending on the electrical path. Metal roofs present unique challenges in that the surface is conductive unlike other types such as shingle, ballasted or single ply.
Severing of conductors in both metal and plastic conduit results in electrical and fire hazards. Care must be exercised during ventilation and overhaul.
Responding personnel must stay away from the roofline in the event of modules or sections of an array sliding off the roof.
Fires under an array but above the roof may breach roofing materials and decking … allowing fire to propagate into the attic space of the building.
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