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Message: <blockquote data-quote="FuzzyGrub" data-source="post: 247328" data-attributes="member: 3438">#1, If you drive a screw through the floor and it connects to both the positive and negative wire, good chance of a fire.  It won't stop until the wire or screw melts.  Just like in your home, the breaker protects the wire, and prevents fires.  I have seen 16ga wire short (with no fuse/breaker).  The insulation vaporizes and the wire is red hot like a bulb filament, in a fraction of a second.  All wires need a breaker or fuse near the positive source. #2 Convienent place to tie the negative wires from the individual devices.  Many panels will already have this, and additional ones won't be neccessary.#3 Correct, not a good practice.</blockquote>