What are the smallest and largest trade sizes for Electrical Metallic Tubing (EMT)?

The smallest and largest trade sizes for Electrical Metallic Tubing (EMT) are indeed 1/2" and 4", respectively. EMT is a type of conduit used in electrical installations to protect and route electrical wiring. The standard size range for EMT, as defined by ANSI and the National Electrical Code (NEC), begins at 1/2 inch and goes up to 4 inches.

This range is significant because it provides flexibility for various applications, ensuring compatibility with different wire sizes and installation scenarios. The smaller size (1/2") is commonly used for residential wiring in smaller circuits, while the larger size (4") is suitable for more substantial conduit runs needed in commercial and industrial settings.

Other options suggest different ranges that don't align with these standards. For instance, option B suggests a size that extends to 5", which exceeds the maximum standard for EMT. Option C restricts itself to a smaller range, which does not encompass the full spectrum of EMT sizes. Option D similarly states a range that goes beyond the standard size limitations established for EMT.