Specifications

89 of 104
Grounding shall be in accordance with Section 250-6 "Portable and Vehicle Mounted Generators" of the
NEC. Ungrounded systems shall not be used. Only stranded or braided copper conductors shall be
used for grounding and bonding.
An equipment grounding means shall be provided in accordance with Section 250-91 (Grounding
Conductor Material) of the NEC.
The grounded current carrying conductor (neutral) shall be insulated from the equipment grounding
conductors and from the equipment enclosures and other grounded parts. The neutral conductor shall
be colored white or gray in accordance with Section 200-6 (Means of Identifying Grounding
Conductors) of the NEC.
In addition to the bonding required for the low voltage return current, each body and driving or crew
compartment enclosure shall be bonded to the vehicle frame by a copper conductor. This conductor
shall have a minimum amperage rating of 115 percent of the nameplate current rating of the power
source specification label as defined in Section 310-15 (amp capacities) of the NEC. A single conductor
properly sized to meet the low voltage and line voltage requirements shall be permitted to be used.
All power source system mechanical and electrical components shall be sized to support the continuous
duty nameplate rating of the power source.
Operation
Instructions that provide the operator with the essential power source operating instructions, including
the power-up and power-down sequence, shall be permanently attached to the apparatus at any point
where such operations can take place.
Provisions shall be made for quickly and easily placing the power source into operation. The control
shall be marked to indicate when it is correctly positioned for power source operation. Any control
device used in the drive train shall be equipped with a means to prevent the unintentional movement
of the control device from its set position.
A power source specification label shall be permanently attached to the apparatus near the operator's
control station. The label shall provide the operator with the information detailed in Figure 19-4.10.
Direct drive (PTO) and portable generator installations shall comply with Article 445 (Generators) of the
NEC.
Overcurrent protection
The conductors used in the power supply assembly between the output terminals of the power source
and the main over current protection device shall not exceed 144 inches. (3658 mm) in length.
For fixed power supplies, all conductors in the power supply assembly shall be type THHW, THW, or
use stranded conductors enclosed in nonmetallic liquid tight flexible conduit rated for a minimum of
194 degree Fahrenheit (90 degrees Celsius).
For portable power supplies, conductors located between the power source and the line side of the
main overcurrent protection device shall be type SO or type SEO with suffix WA flexible cord rated for
600-volts at 194 degrees Fahrenheit (90 degrees Celsius).
Wiring Methods
Fixed wiring systems shall be limited to the following:
- Metallic or nonmetallic liquid tight flexible conduit rated at not less than 194 degrees Fahrenheit
(90 degrees Celsius)
or