I understand that alot of shorts to ground will cause a fuse to blow. However; I have heard some say that sometimes a short to ground will not effect the fuse? In a situation where the short does not blow the fuse- is it that the wire in question has rubbed or fused with another that is actually contacting ground? Can you guys clarify this for a retired DIYer.
Thanks.
MrMike
"The object of war is not to die for your country but to make the other bastard die for his"
Imagine a component that is ground side controlled. An interior light for example, old style. You open the door and the switch gets grounded. Your light comes on. If the ground wire was to get shorted directly the lamp will come on as well and stay on all the time as long as this short to ground is present.
No fuse will be blow in this situation. The lamp acts as a current limiter. This will hold true for any circuit where the component/lecctrical load is upstream of the short to ground and the current has to flow through it.
Any fuse will blow (some sooner than others) when there is more current flowing than the fuse is designed for. Typically this is the case with a "direct" short to ground on the positive leg of the circuit. In this scenario the current flow is not limited by any component.
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