If you need to add shielding around nets or generally make other nets as wide as possible a simple method to do this is to add copper pour regions to your design. Simply draw a filled polygon that has been assigned to a net. Objects that are contained within the filled polygon region that do not belong to the filled polygons net will be isolated from the copper region. Those that are assigned to the same net will be tied to the copper region. In the picture below, NET1 is surrounded by a copper pour that has been assigned to the GND net. Copper pour does not flood over anything that has a different net property than itself. Even pins that do have the same net property as the copper are cleared out and tied to the copper through ?spokes to help soldering by focusing the heat on the pin.
The default isolation gap between copper pour and other objects is 0.008 for standard 1oz copper clad and 0.013 for 2.5oz copper clad boards. This clearance may be increased on certain objects whose net spacing rule dictate a greater clearance, including the copper pour net itself. By specifying worst case spacing on grounds and voltages, copper pour can be safely used while guaranteeing adherence to standards and regulation bodies requirements such as Underwriter Labs (UL). Care must be taken when adding copper pour to congested areas so that pins are not isolated. Pins that belong to the same net have connection lines, or a ratsnest between them. The connection lines disappear when: A continuous routed path is completed between the pins. The pins net is assigned to a plane layer and the pins hit the plane layer through a plated hole. The pins are contained in a copper pour region assigned to the same net.
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