M. Shipp_A Fire Safety Overview
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Transcript of M. Shipp_A Fire Safety Overview
Part of the BRE Trust
A Fire Safety OverviewBRE Trust/BPVA Workshop
Photovoltaics and Fire: Separating fact from fiction
12th July 2011, BRE, Watford
Martin Shipp
Technical Development Director, Fire
Safety, BRE Global
Electricity can cause fires
Fire Statistics; electrical fires
All dwelling fires: proportion of electrical and non-electrical fires
electrical fires
chip/fat pan fires
other fires
All dwelling fires: proportion of electrical and non-electrical fires.
All dwelling fires: proportion of electrical and non-electrical fires
electrical fires
chip/fat pan fires
other fires
Fire Statistics; electrical firesElectrical fires in dwellings: proportion of fires due to different causes
faulty fuel supply
faulty lead
faulty appliance
misuse
play or carelessness
heat source too close
other cause
Electrical fires in dwellings: proportion of fires due to different causes
Electrical fires in dwellings: proportion of fires due to different causes
faulty fuel supply
faulty lead
faulty appliance
misuse
play or carelessness
heat source too close
other cause
Fire Statistics; electrical firesElectrical fires in dwellings, proportion of fires from different items first ignited
Electric cookers
Microwave cooker
Other electric cooking appliance
Electric space heater
Electric central heating
Electric water heating
Electric welding & cutting appliances
Electric blowlamp
Washing machine
Dishwasher
Refrigerator
Tumble driers
Spin driers
Lighting
Blanket or bedwarmer
Television
Iron
Audio visual
Computer or VDU
Kettle,Urn,etc
Other electrical
Electrical fires in dwellings, proportion of fires from different items first ignited
Electrical fires in dwellings, proportion of fires from different items first ignited
Electric cookers
Microwave cooker
Other electric cooking appliance
Electric space heater
Electric central heating
Electric water heating
Electric welding & cutting appliances
Electric blowlamp
Washing machine
Dishwasher
Refrigerator
Tumble driers
Spin driers
Lighting
Blanket or bedwarmer
Television
Iron
Audio visual
Computer or VDU
Kettle,Urn,etc
Other electrical
Many new sustainable/environmentally friendly
technologies have fire safety implications
• Modular construction
Many new sustainable/environmentally friendly
technologies have fire safety implications
• Modular construction
• Timber frame
Many new sustainable/environmentally friendly
technologies have fire safety implications
• Modular construction
• Timber frame
• Structural Insulated Panel Systems
Many new sustainable/environmentally friendly
technologies have fire safety implications
• Modular construction
• Timber frame
• Structural Insulated Panel Systems
• Engineered joists
• Cladding systems
• Wind generators
Many new sustainable/environmentally friendly
technologies have fire safety implications
• Do all new technologies introduce
new fire risks?
The issues for PVs
– PV systems can cause fires: fact or
fiction?
– PV systems exacerbate fire hazards: fact
or fiction?
– PV systems present new electrical risks
to firefighters: fact or fiction?
With the permission of Bodo Wolters
PV systems can cause fires: fact or fiction?
– DC not AC
– Installation requires new skills
– Quality of installation critical
– Risk of “cowboy” installers?
– Maintenance important
PV systems exacerbate fire hazards: fact or fiction?
– Falling glass
PV systems exacerbate fire hazards: fact or fiction?
– Falling glass
– Roof loading (added risk of
structural collapse due to weight
of panels)
PV systems exacerbate fire hazards: fact or fiction?
– Falling glass
– Roof loading (added risk of
structural collapse due to weight
of panels)
– Poorly installed panels may
obstruct/restrict use of roof
windows as means of escape
– windows as means of escape
– Fire spread to other properties
from panel materials
PV systems present new electrical risks to firefighters:
fact or fiction?
– Potentially very high DC
voltages (1000 volts?) - more
dangerous than normal
electrical installations
– Always live – can only shut off
utilities, not supply to the
inverter
– Shock risk if cables or conduits
are cut
– Shock risk from batteries
– Shock risk down water jet
– (e.g. Switzerland 2002)
PV systems present new electrical risks to firefighters:
fact or fiction?
– Fire fighters may not recognise PV system – lots of different types
– Fire fighters not used to dealing with DC
– Don’t know what to expect
PV systems present new electrical risks to firefighters:
fact or fiction?
– Fire fighters may not recognise PV system – lots of different types
– Fire fighters not used to dealing with DC
– Don’t know what to expect
– AC detectors will not detect DC?
– Will there be an emergency switch?
– Where?
– What if not ?
PV systems present new electrical risks to firefighters:
fact or fiction?
– Fire fighters may not recognise PV system – lots of different types
– Fire fighters not used to dealing with DC
– Don’t know what to expect
– AC detectors will not detect DC?
– Will there be an emergency switch?
– Where?
– What if not?
– Confusion with solar thermal?
Heavy metals released: fact or fiction?
– Cadmium Telluride? CdTe
– Only a problem if exposed to very high temperatures?
1100 deg C – seldom reached in uncontained fires.
– Gets encapsulated by glass?
Stories from US
– Firefighters cut through panels to vent fire -
electrocution
– Panels prevent venting
– Panels may be slippery – hazard for fire fighters on the
roof
– May limit access to and use of roof
– Looking at use of portable covers
Stories from Germany
– 1000 volts DC down hose?
– German firefighters refused to fight fires involving PVs
PV systems can cause fires?
– Installation guides recognise fire
risks
PV systems can cause fires?
– Installation guides recognise fire
risks
PV systems can cause fires?
– Installation guides recognise fire
risks
– Cut off switches on the market
PV systems present new risks to firefighters?
– Other countries have produced
guidance
– US
– Germany
PV systems present new risks to firefighters?
– Other countries have produced
guidance
– Not aware of any
problems/issues in UK (yet)
– Problem for fire risk assessors
– how to assess risk?
– risk assessors need
guidance
– UK needs guidance to reflect
UK firefighting practice?
Fire and Rescue Service Operational Guidance
GRA 3.1 Fighting fires in buildings
– ELECTRICAL SYSTEMS ON EXTERNAL
BUILDING FASCIAS
– Electrical systems may be found in
external positions on buildings.
– These may include photo-voltaic panels
and shop signs etc which present an
electrical shock hazard, or shock track
(electric) bird abatement systems, which
although only being low voltage, may be
hazardous if a firefighter were to touch it
whilst at the head of a ladder.
Conclusions
– We need to ensure that all innovations in designs, products and materials that are supporting more sustainable and environmentally friendly buildings do not introduce unexpected fire risks.
– There may be some new fire risks associated with photovoltaics.
– Some of the concerns may be unfounded; others may need a response.
– We need to all work together to ensure that the fire issues are dealt with logically and professionally and not subject to simple commercial pressures.
– We need to all work together to develop practical solutions, and practical guidance.
Thank you
Martin Shipp, Technical Development Director, Fire Safety
BRE Global
T: +44 (0) 1923 664960
F: +44 (0) 1923 664910
W: www.bre.co.uk/fire
BRE, Garston, Watford WD25 9XX, UK