Open Access
Table 4
Comprehensive evaluation system and scoring standard of electrical fire risk assessment.
| Comprehensive evaluation system of electrical fire risk weight A | Criterion layer | Index layer | 0points | 1-9points | 10points | |
| Fire combustion risk B1 |
Peak heat release rate C1 (KW) |
C1＜1500 | 1500≤C1≤3500 | 3500＜C1 | ||
| Time for the temperature of the hazard room to reach 200℃ C2（s） |
50＜C2 | 20≤C2≤50 | C2＜20 | |||
| Time for the average temperature of other rooms to reach 140℃ C3（s） |
400＜C3 | 100≤C3≤400 | C3＜100 | |||
| Flame spread C4 |
Not spread | Spread to some rooms | Spread to all rooms | |||
| Rate of accidents in electrical fire C5(％) |
C5＜5 | 5≤C5≤60 | 60＜C5 | |||
| Flue gas risk B2 |
Peak smoke density C6 (kg/m3) |
C6＜1×10-3 | 10-3≤C6≤10-2 | 50×10-3＜C6 | ||
| Time when visibility is less than 3m C7(s) |
100＜C7 | 10≤C7 ≤100 | C7＜10 | |||
| Total smoke release quality C8（kg) |
C8＜0.5 | 0.5≤C8≤5 | 5＜C8 | |||
| Toxic gas risk B3 |
Time of CO2 reaching dangerous concentration（2000ppm） C9（s） |
100＜C9 | 20≤C9≤100 | C9＜20 | ||
| Time of CO reaching dangerous concentration（800ppm） C10(s) |
100＜C10 | 20≤C10≤100 | C10＜20 | |||
| Peak CO concentration C11（％） |
C11＜0.5 | 0.5≤C11≤1 | 1＜C11 |
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