BS PD IEC TR 60695-7.3 : 1998

Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principles of toxic hazard assessment
5 Methods of toxic hazard assessment
5.1 Background on fire hazard assessment
5.2 Toxic hazard assessment
5.2.1 General approach
5.2.2 Fractional effective dose (FED)
5.2.3 Approaches to estimating exposure dose, (Ct)
5.3.4 Approaches to expressing toxic potency
6 Effluent components to be measured and toxic potency values
6.1 Minimum reporting
6.1.1 Gaseous fire effluent components
6.1.2 Other components
6.2 Additional reporting
Annex A (informative) Secondary effects of fire conditions on
        toxic hazards
A.1 General
A.2 Effects of irritants
A.3 Interaction of carbon dioxide and carbon monoxide
A.4 Effects of oxygen depletion
A.5 Effects of elevated temperatures (heat stress)
A.6 Effects of stratification and transport of fire atmospheres
Annex B (informative) Guidance for the use of LC50 values
B.1 General
B.2 Limiting hazard
B.3 Use of LC50 values in specific types of fires
B.3.1 Smouldering fires
B.3.2 Flaming, pre-flashover fires
B.3.3 Flaming, post-flashover fires
B.3.3.1 General
B.3.3.2 Enhanced carbon monoxide
B.3.3.3 Simplification of LC50 values
Annex C (informative) Simple worked example to illustrate the
        principles of a toxic hazard analysis
C.1 The problem scenario
C.2 Information available
C.3 Hazard analysis
Figures
1 Total FED and each contributor, both are time-dependent
2 Typical time dependence of smoke concentration
3 Time dependent behaviour of the components of fire hazard
Bibliography

Defines guidance on the use and interpretation of results obtained from laboratory tests. Describes currently available approaches to toxic hazard assessment consistent with the approach of ISO TC 92 SC 3, as set out in ISO/TR 9122-6. Deals with guidance on the use of toxic potency data in hazard assessment and on principles which underlie the use of combustibility and toxicological information in hazard assessment. Applicable to data produced by tests measuring the lethal effects of fire effluents. When interpreting data produced by tests which measure the incapacitating effects of fire effluents, the general principles apply.