Article 555 of the 2014 Edition of the NEC provides the electrical installation requirements for various types of marine installations (see SIDEBAR 1: Where Do These Rules Apply?). Unless the installation is a small dock for a private residence, it’s probably covered by the requirements set forth in this Article (Photo 1). Datum plane Article 555 provides a detailed definition of the “electrical datum plane” (EDP) [555.2], but uses this concept only in four sections. It ...

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