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Double tapping at ground and neutral wires on bus bars in main electric panel. if all houses in this subdivision were built at the same time under same code why when you try to sell your home it would be flagged by an inspector as needing to be fixed.
Hey Janet thanks for your question. By double tapping I'm guessing you mean having a grounded (neutral) conductor and an equipment grounding conductor in the same termination hole within the panelboard. The rule that required grounded conductors terminate in a terminal that was used for no other conductor was added to the 2002 NEC in 408.21 (now 408.41). Substantiation for the change in ROP 9- 113 stated that this was a " long standing product standard requirement" included in manufacturers installations instructions that are enforceable as stated in 110.3(B) but needed to be in the NEC.
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