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[QUOTE="Skymaster, post: 134353, member: 36626"] Much better! :) That wont end in smoke or tears unlike the first diagram :) Fuses are to protect the cable not to protect the devices attached to it. They should be rated such that they blow before the wire attached melts. In a domestic situation, for a 10A appliance, it'll have 1mm2 cable on it, and smaller appliances will have 0.75mm2 cable. 0.75mm2 is good for up to about 8A, but in the pixel case, the voltage drop at that current will absolutely kill you. At 3m, you're already losing a volt, after which you'll start to see colour issues. A 7.5A fuse is probably the most appropriate here. This would imply roughly 156 pixels, at full white, at 100%. Real-world though, you can squeeze more out of it because the pixel wire resistance comes into play and each pixel does not draw it's full 48mA. Now, if you were to do power injection, you'd use the additional fused outputs, and take those to the far ends or centres of the string, where needed. That way each cable is protected to its maximum, but overall you get more. People will argue that it does mean that when one cable is overloaded and the fuse blows, it'll overload the other fuses. Yes, it will, You'll get a cascading failure. But you wont get a fire. [/QUOTE]
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