Seat Belt signs.
The following is a Silks opinion of the use of Seat Belt signs during flight obtained by a Flight Safety organisation in the UK.
"In the event of the seat belt sign being illuminated in flight the primary responsibility rests with the commander to ensure that the cabin is secure. In practice this responsibility is exercised through the In-Charge cabin crew member by procedures for communication between the flight deck and the cabin.
Once the flight crew has been made aware of turbulence, the normal course of action is to advise the In-Charge cabin crew member that the seat belt sign is being illuminated and when the signal has been illuminated, the cabin crew should check that all passengers are secured and that the galley equipment is stowed before getting strapped in themselves. This does mean that if the cabin service is underway it is suspended at that point and resumed when the seat belt sign is switched off. "
How does it compare with your company's policy?