The EF and NR power cords are identical in most ways. The external hollow sleeve is absent in the EF series. Also, we use a flat IEC connector with the EF models instead of the round barrel type connector in the NR Series. Both connectors use solid-copper internal metals, but the NR model has a built-in wide-bandwidth noise filter, while the EF models do not (no room). Having said all that, the performance between the EF and the NR model is comparable in both Delta and Alpha models. The cables themselves can turn almost at a 90 degree angle after an inch or so of cable, so I would put the minimum clearance needed at about 8 inches for either the NR or EF models. The Alpha NR may look thick, but actually it is extremely flexible and easy to bend in any direction.
Regards,
Grant
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