General requirements. Existing electrical fixtures, devices,
wiring and systems shall be maintained in safe working condition and in a
manner which will avoid a potential source of ignition or shock and shall
be properly connected to a reasonable, adequate source of electrical power.
Any old deteriorated, unused and/or unapproved materials and equipment shall
be removed and replaced, as may be required, with approved materials and equipment.
Existing electrical installations or systems shall further be installed in
accordance with standards in force at the time of installation and approved
by the National Board of Fire Underwriters. Any alterations, major repairs
or additional installations shall comply with the requirements of the National
Board of Fire Underwriters. Fixed wiring, equipment, fixtures and devices
shall be firmly secured to the surface on which they are mounted. Electrical
wiring and equipment shall be protected against excessive current demands
by properly rated over current devices installed in approved locations. All
panelboards shall be kept free from encumbrances and shall be accessible at
all times.