The P-Tap/D-Tap port popularized by Anton Bauer has the unfortunate design flaw of being too easily reversible. A slight curve on one side of the port is supposed to prevent this, but differences in build tolerances amongst manufacturers have led to many a piece of gear being fried by a D-Tap plugged in the wrong way. Some products were even designed to take reverse polarities, meaning that you have to purposely wire it the opposite way.
The SafeTap's most basic feature is that it will not pass any current if the plug's polarity is incorrect.
You can only imagine the myriad problems that might occur if a DP tasked a less experienced AC with managing their camera build, or hasty set conditions that might cause a mistake to happen in the dark. Thousands of dollars in damage can occur to D-Tap powered monitors, follow focuses, and transmitters if the plug is reversed.
from No Film School http://ift.tt/1X91I04
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