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15.4.6 When determining whether splice insulation consisting of coated-fabric, thermoplastic, or other
tubing is acceptable, consideration is to be given to such factors as dielectric properties, heat-resistant
and moisture-resistant characteristics, and the like. Thermoplastic tape wrapped over a sharp edge is not
acceptable. An insulated splicing device is acceptable within the limits of voltage and temperature ratings
of the device.
15.4.7 The means of connecting stranded internal wiring to a wire-binding screw shall prevent loose
strands of wire from contacting other live parts not always of the same polarity as the wire, and from
contacting dead metal parts. This may be accomplished by the use of a pressure terminal connector, a
soldering lug, a crimped eyelet, soldering of all strands together, or other reliable means.
15.5 Separation of circuits
15.5.1 Unless provided with insulation acceptable for the highest of the circuit voltages, factory-installed
insulated conductors of different circuits within a converter or inverter including wires in a terminal box or
compartment, shall be separated by barriers or shall be segregated and shall be so separated or
segregated from uninsulated live parts connected to different circuits.
15.5.1 effective April 13, 1993
15.5.2 Segregation of factory installed insulated conductors may be accomplished by clamping, routing,
or an equivalent means that will maintain permanent separation from insulated and uninsulated live parts
and from conductors of a different circuit.
15.5.3 Field-installed conductors of a circuit shall be segregated (see 15.5.4) or separated by barriers
(see 15.6.1 – 15.6.4) from:
a) Factory-installed conductors connected to any other circuit, unless the conductors of both
circuits are or will be insulated for the maximum voltage of either circuit.
b) An insulated live part of another circuit.
c) Field-installed conductors connected to any other circuit unless both circuits are Class 2 or 3
or both circuits are other than Class 2 or 3, and both circuits are or will be insulated for the
maximum voltage of either circuit.
15.5.4 Segregation of a field-installed conductor from another field-installed or factory-installed conductor
or from an uninsulated live part connected to another circuit can be accomplished by locating an opening
in the enclosure for the conductor opposite to the conductor terminal so that, when the installation is
complete, the conductors and parts of different circuits will be separated by a minimum of 1/4 inch (6.4
mm). In determining if a device with such openings complies with this requirement, it is to be wired as in
service including 6 inches (152 mm) of slack in each conductor within the enclosure. No more than
average care is to be exercised in routing the wiring and stowing the conductor slack into the wiring
compartment.
OCTOBER 15, 2004UL 45830
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