UL COPYRIGHTED MATERIAL –
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
24 Lampholders
24.1 The screw shell of an Edison-base lampholder in a converter shall be connected to a conductor that
is intended to be connected to the grounded conductor of the power-supply circuit.
24.1 effective April 13, 1993
24.2 A lampholder shall be designed or installed so that uninsulated live parts, other than a screw shell,
will not be exposed to contact by persons removing or replacing the lamp in normal service.
25 Capacitors
25.1 A capacitor connected across the line, such as a capacitor for radio-interference elimination or
power-factor correction, shall be housed within an enclosure or container that will protect the plates
against mechanical damage and will prevent the emission of flame or molten material resulting from
breakdown of the capacitor.
25.2 The container of a capacitor shall be of metal providing strength and protection not less than that of
uncoated steel having a minimum thickness of 0.020 inch (0.51 mm).
Exception: The container may be of thinner sheet metal or may be of material other than metal, if the
capacitor is mounted inside a converter having an enclosure that complies with the requirements in 6.1 –
6.4.
26 Transient Voltage Surge Suppressors
26.1 Transient voltage surge suppressors connected across a primary supply circuit or between primary
circuits and ground shall comply with the applicable requirements in the Standard for Transient Voltage
Surge Suppressors, UL 1449.
26.1 effective April 13, 1993
27 Printed Wiring
27.1 A printed circuit board shall comply with the Standard for Printed Wiring Boards, UL 796.
OCTOBER 15, 2004 UL 458 36A
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