1.10.3 Over 600 Volts, Nominal
1.10.3.1 General. Conductors and equipment used on circuits over
600 volts, nominal, shall comply with Part 1.10.1 and with the
following sections, which supplement or modify Part 1.10.1. In no
case shall the provisions of this part apply to equipment on the supply
side of the service point.
1.10.3.2 Enclosure for Electrical Installations. Electrical
installations in a vault, room, or closet or in an area surrounded by a
wall, screen, or fence, access to which is controlled by a lock(s) or
other approved means, shall be considered to be accessible to licensed
electrical practitioner or non-licensed electrical practitioner under the
supervision of a licensed electrical practitioner only. The type of
enclosure used in a given case shall be designed and constructed
according to the nature and degree of the hazard(s) associated with the
installation.
For installations other than equipment as described in 1.10.3.2(d), a
wall, screen, or fence shall be used to enclose an outdoor electrical
installation to deter access by persons who are not qualified. A fence
shall not be less than 2 100 mm in height or a combination of
1 800 mm or more of fence fabric and a 300 mm or more extension
utilizing three or more strands of barbed wire or equivalent. The
distance from the fence to live parts shall be not less than given in
Table 1.10.3.2.