Re: classified area at marina
You have stumbled upon one of the more interesting questions going on in electrical area classification debates: Does electrical area classification apply to locations where there are no ignition sources covered by the NEC? There are fairly strong arguments on both sides. One side will say that area classification is simply determined by the ?geometry? of the potential fuel sources regardless of ignition sources. The other side says the Scope of the NEC limits it to
installations ; [90.2(A)] it is
electrical area classification and, if there are no ignition sources covered by the NEC, there is no reason to classify the area.
For example automobiles, except parts of motor homes, are generally exempt from the NEC yet they drive through Division 2 locations literally millions of times a day. More significantly, the hose nozzle is usually well above 18? yet there is no indication in Art 514 that there should be a ?roving? fuel source above 18?.
The closest thing to a recognized ?mobile? fuel source is shown is Figure
515.3 . (Bulk Storage) In this case the source may move but the electrical area classification is still fixed.
The general resolution to the original question is that the electrical area classification definitely applies to permanent installations but ?mobile? operations may be reviewed, case-by-case. The incidental ?spill? at a hose nozzle usually does not warrant electrical area classification. The dispenser is different; under ?abnormal? conditions a small leak could produce a persistent fuel source; therefore it is the judgment of the TC/CMPs that Figure 514.3 is necessary and sufficient to define the boundaries.
With regard to your second question: ?Type W? is permitted as a Division 2 wiring method where the application is consistent with Section 501.4(B)(2). In general, listed cables with undamaged jackets are permitted to pass completely through Division 2 locations with no additional seals per 501.5(E)(3) Exception. Note: Section 501.5(E)(4) applies to cables with interlocked armor sheaths or damaged jackets.
Thank you for your very vote of confidence