2.1 Thesystemsshouldreadilyidentifytheroutesofescapewhenthenormalemergencylighting is less effective due to smoke.
2.2 The systems should be such that, in case one exitmaynotbeused,personsarestillableto easily find their way towards another exit.
2.3 Systemsrelyingonexternalpowersources,includingthosethatareautomaticallyactivated orcontinuouslyoperating,shouldbecapableofbeingmanuallyactivatedbyasingleactionfroma continuously manned central control station.
2.4 Electricallypoweredsystemsshouldbeconnectedtotheemergencyswitchboardrequiredby regulationII-1/42ofthe1974SOLASConvention,asamended,soastobepoweredbythemain source of electrical power under normal circumstances and also by the emergency source of electrical power when the latter is in operation.
2.5 Allelectricallypoweredsystemsshouldbearrangedsothatthefailureofanysingledevice, or battery will not result in the systembeing ineffective.
2.6 Thesystemsshouldnotpreventeffectivecommunicationbetweenthefire-fightingparties and the continuously manned control station.
2.7 Theperformancesofthesystemsshouldnotbeimpededbythesimultaneousfunctioningof any other systems, expected to be used in normal or under emergency conditions (e.g. public address systems, emergency lighting systems, etc.).