Assessment and Optimal Design of Lighting of Emergency Exit Route Based on Standards and Time Performance: Case Study of a Combined Cycle Power Plant; ارزیابی و طراحی بهینه روشنایی مسیر خروج اضطراری براساس استاندارد و عملکرد زمانی افراد: مطالعه موردی نیروگاه سیکل ترکیبی



Ss Pak Somaye SALARI ; Sa Zakeriyan Seyed ABOLFAZL ; F Fatemi FARIN ; S Gharib SEIFOLLAH
Source: Iran Occupational Health Published:2025

Abstract

Background and aims: Lighting of escape routes is crucial in emergency evacuations, as it provides the necessary illumination for safe and rapid evacuation. The aim of the present study is to assess lighting conditions in emergency evacuations before and after interventions Methods: This interventional study was conducted on the emergency lighting system of the control unit of a power plant. First, the study assessed emergency lighting levels, individuals' evacuation speed, visibility of signs along the escape route, and the ability to identify escape routes. These factors were evaluated during a simulated electrical system failure scenario using recorded movement speeds from night vision cameras and a designed checklist. Next, necessary interventions, including the installation of fluorescent tapes, were implemented in the emergency exit routes. Finally, a reassessment was conducted two weeks after the intervention. Results: The results indicated a significant difference in evacuation time before and after the intervention. The post-intervention evacuation time showed a significant decrease (P-value < 0.0001). The mean evacuation time decreased from 38.8 ± 10.4 seconds before the corrective action to 27.7 ± 8.66 seconds after the intervention. Additionally, a significant improvement in the assessment of the escape route was observed between pre- and post-intervention. The mean assessment score of the routes increased from 18.6 ± 1.56 before the intervention to 22.5 ± 2.1 after the corrective action. The mean illumination intensity of the escape route pre- and post-intervention was 5.52 ± 2.02 and 19.90 ± 2.47, respectively. Conclusion: The findings of this study indicate that modifications to the design of exit routes, including the installation of fluorescent tapes and exit signs, can enhance individuals' ability to locate and use escape routes effectively. Moreover, the proper design of emergency exit routes can help reduce congestion and alleviate stress in critical situations. The results also demonstrated individuals’ satisfaction with the improved ability to quickly and easily find the exit route following the implementation of appropriate emergency exit route designs. © 2025 Elsevier B.V., All rights reserved.