I've got an installation of a outdoor security camera with coax for the video signal and STP (shielded twisted pair) for the 12VDC power. To protect from lightning strikes I have grounded the coax shield and power cable shield to a grounding plate before coming indoors. What can I do to protect the power supply from an incoming surge on the power lines coming in to my house? The transient surge suppressors I see are geared toward protecting the equipment end from a surge at the main power but not from incoming surges from lightning. Any one familiar with products that protect from that end and what they are called?