As subject.
Is it safe to power CCTV cameras from the PC's PSU? I think the outer of the BNC is grounded to the chassis/earth. But is the negative of the PSU grounded to, or will something bad happen? I may just try to measure the negative rail with respect to ground?
The cameras consume 200 mA (with IR leds on, IIRC) so the load isn't that big.