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Tubing size



Original poster: trwalters001@xxxxxxxxxxx

Hi All,
When the copper tubing for a primary is discussed as being either 1/4" or 3/8", is that the industry-standard tubing size or the actual measured diameter of the tubing?


The reason I ask is that 1/4" copper tubing measures 3/8" in diameterand 3/8" tubing measures 1/2" in diameter.

My 10" coil is going to be powered by nine (9) 15KV, 30mA transformers in parallel (4 KVA). If anyone has comments or suggestions, please let me know.

Thanks!
Tim Walters