Third Party Verification Claim

Page 38 of 129 Report No.: JAT2209271146SR-1
UL 859
Clause
Requirement + Test
Result - Remark
Verdict
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26.1.6
There shall be a spacing of not less than 1/16 inch
(1.6 mm) between uninsulated line voltage parts of
opposite polarity, and between an uninsulated
line-voltage part and a dead-metal part that might
be exposed to contact by persons during
operation of the appliance or that might be
grounded. If an uninsulated live part is not rigidly
supported, or if a movable dead-metal part is in
close proximity to an uninsulated live part, the
construction shall be such that this minimum
spacing will be maintained under all operating
conditions
N/A
Exception: At closed-in points only, such as the
screw and washer construction of an insulated
terminal mounted in metal, a spacing of no less
than 3/64 inch (1.2 mm) may be used. Within a
thermostat, other than at contacts, the spacing
between uninsulated live parts on opposite sides
of the contacts shall not be less than 1/32 inch (0.8
mm) through air and 3/64 inch over surface of
insulating material, and the construction shall be
such that the spacings will be permanently
maintained.
N/A
26.1.7
An insulating lining or barrier of fiber or similar
material shall be so located or of such material
that it will not be affected adversely by arcing. If
the lining or barrier is used instead of an air
spacing, the material shall not be less than 1/32
inch (0.8 mm) thick
N/A
Exception No. 1: The insulating material may be
1/64 inch (0.4 mm) thick if a fiber liner or barrier is
used in conjunction with an air spacing not less
than 50 percent of that required for air alone
N/A
26.2
Spacings on printed wiring boards
P
26.2.1
As an alternative to the spacing requirements in
26.1.6, a printed wiring board with spacings
between opposite polarity circuits (other than a
low-voltage circuit) less than those required is
acceptable provided that the spacings
P
Are located on a portion of the printed wiring board
provided with a conformal coating that complies
with the requirements in the Standard for
Polymeric Materials – Use in Electrical Equipment
Evaluations, UL 746C, and the dielectric voltage-
withstand test described in Section 45; or
P
Are located on the load side of a resistor such that
a short circuit from the load side of the resistor to
the other side of the line does not result in the
resistor power dissipation exceeding the resistor
wattage rating.
N/A