UL 98:2004 pdf download Enclosed and Dead-Front Switches
1 Scope
1.1 These requirements cover individually enclosed air switches, rated 4000 A or less at 600 V or lesshaving all current-carrying parts enclosed, manually operable by means of external handles, and intendedto be employed in accordance with the national installation codes listed in Appendix B, Ref. No.1.
1.1.1 As used in this Standard, the term switch is intended to mean an enclosed switch or deadfrontswitch unless specifically stated otherwise.
1.2 These requirements also cover deadfront switches that have all current-carrying parts enclosed whenmounted in an enclosed panelboard, deadfront switchboard, or the like, These switches are manuallyoperable by means of external handles and are intended to be employed in accordance with the nationainstallation codes listed in Appendix B, Ref. No.1.
1.3 These requirements cover enclosed switches with or without provision for plug or forcartridge-enclosed fuses.
1.4 These requirements cover enclosed switches intended for general use and having ampere ratingswith or without horsepower or kilowatt ratinas, and enclosed switches intended for motor-circuit use onlyand having horsepower or kilowatt ratings but no general-use ampere ratings.
1.5 These requirements cover double-throw switches intended for use in optional standby systems
1.6 These requirements cover fused electrically tripped switches rated over 600 A and rated 600 A or lessemploying Class J, R or T fuses.
1.7 These requirements also cover electrically tripped switches that have been investigated to determinetheir acceptability for ground-fault protection when combined with ground-fault sensing and relayingequipment as follows:
a) Switches for use with Class I ground-fault sensing and relaying equipment include those thatare capable of interrupting 12 times their rated current or that have integral means to preventdisconnecting as levels of fault current exceeding the contact interrupting capability of theswitch.
b) Switches for use with Classground-fault sensing and relaying equipment are capable otinterrupting 10 times their rated current and are for use in ground-fault protection systems inwhich means to prevent disconnecting at levels of fault current exceeding the contactinterrupting capability of the switch are incorporated within the ground-fault sensing and relayingequipment when combined with Class I and ll ground-fault sensing and relaying equipment.
1.8 These requirements do not cover:
a) Common forms of snap switches.
b) Switches having features intended primarily for the starting and protection of motors.including the switches arranged to shunt out fuses during the starting of motors,
c) Switches provided with automatic trips for opening them and constructed to afford overloadprotection without other circuit breakers or fuses,
d) Devices in which the pulling of fuses or the removal of a detachable pullout member isdesigned to accomplish a switching operation, or
UL 98:2004 pdf download
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