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I've been given positive and zero sequence resistance and reactance (X1, X0, R1, & R0) and need to calculate the X/R for my system. I seem to recall that the formula is X/R=(2)*X1/R1 +X0/R0? Can anyone confirm, its been a while since I've used symmetrical components and appreciate the help.

Does anyone have a copy of CEA 249 D 541 reference in Appendix B for rule 36-304(3) in the Canadian Electrical Code? It does not appear that this is available anywhere on the interweb. From my understanding, it is a white paper "Simplified Rules for Grounding Customer-owned High Voltage...