Locks for metal frames

Can a lock for metal frames be used for other types of frames?
Some locks have been specifically designed for steel doors and gates, therefore they cannot have a different use. On the other hand, other locks can be adapted to different frames: for example, electric mortice locks can also be used on wooden doors and frame locks can be used for aluminium frames.

Which voltage must be used for an electric lock?
Most electric locks operates with a 12 volt Ac or Dc, but there are also 24 volt versions. Carefully read the instructions.

Can an electric lock be opened if the voltage runs out?
Electric locks are generally provided with a cylinder or handle for mechanical opening. According to the application, the cylinder and the handle could be only internal, only external or both.