Home » English riddles » Grounding » Grounding Riddle No.27 – Neutral cable size for power transformer » Reply To: Grounding Riddle No.27 – Neutral cable size for power transformer Reply To: Grounding Riddle No.27 – Neutral cable size for power transformer 2021-08-03 at 11:08 am #2334 GLAVIZH One MCM isn’t 106 CM . It’s 103 CM . One MCM is 0.5066 mm2 OR 1 mm2 1.974 MCM