low voltage

Is it okay to give cameras 13.5v constantly? When it was 12v in the night some cameras turned off and other got some abnormal lines now when i made it 13.5v they are fine in the night but will this harm the cameras? Thanks in advance for reading this.

My home is just past the framing stage and the electrician just finished up. I will be running my low voltage wires for the cameras very soon. I just have one question. When i run the wire to the exterior of the home, how do I terminate the end considering I won't be installing the cameras until...