Emergency lighting in flats stairwell and entrance

[Taylortwocities]

Going back to emergency lighting and design.

One person that you WILL have to satify is the local fire officer.

He will be one of the signatories to the completion document so you MUST get his input otherwise you may need to put in more lights than you quoted for, and maybe at your expense...

There are requirements for external emergency lighting outside each external fire exit door. Have you included this.

Also at exits, and at fire call points, and fire-fighting equipment, changes in exit direction, etc etc.

Rather like the Wiring Regulations. When you complete the job you will be signing off the emergency lighting system as a person who is COMPETENT to design, install and test the system.

It's your sausage on the block if there's a fire and the family in flat 4 can't get out because you forgot to put an adequate emergency lighting provision at the top of those stairs.

Google "Emergency Lighting Design Guide". Theres a few free ones out there.

 

[tangowaggon]

It would not be sensible to use the same neutral conductor for the lighting and the interlinked smoke alarms. The trigger signal uses the neutral as its reference and lighting currents along the neutral will cause a voltage drop along the neutral. This voltage drop will alter the potential difference between the neutral and the trigger at each smoke alarm. This may affect the triggering as the trigger voltage is often less than 9 volts so a one volt drop along the neutral will change the trigger voltage by more than 10 percent. When lights switch on inrush current along the neutral may create enough voltage drop to trigger some of the alarms. Also the high current as lamp burns out may do the same.

Ahhhhh, this is the sort of answer I need, makes a lot of sense, thank you

 

[bernardgreen]

Thanks Dylan. but the post is 18 months old.