UL Standard for Safety Power Converters/Inverters and Power Converter/Inverter Systems for Land Vehicles and Marine Crafts (Fifth Edition; Reprint with revisions through and including March 18@ 2010)
These requirements cover fixed and stationary power converters@ power-converter systems@ and accessories having a rated nominal input of 120@ 120/240@ or 240 V@ alternating current and a nominal output of 24 V or less@ direct current. These converters are intended for use within land vehicles where not directly exposed to outdoor conditions@ and are intended to be employed in accordance with the National Electrical Code@ NFPA 70. These requirements also cover fixed@ stationary and portable power inverters and power-inverter systems having a dc input and a 120 or 240 V ac output. These inverters are intended for use within land vehicles where not directly exposed to outdoor conditions@ and are intended to be employed in accordance with the National Electrical Code@ NFPA 70. These requirements also cover converters/inverters that are additionally intended to charge batteries. Power converters covered by Part I of this standard are intended for connection to established 15- and 20-A branch circuits within a recreational vehicle. Power-inverters covered by Part I of this standard are intended for connection to a 12- or 24-V dc battery supply. Converters and inverters incorporating provisions for the connection of less than three line-voltage branch circuits are investigated under the requirements in Part I of this standard. A power-converter or power-inverter system is intended for direct connection to a power-supply assembly. A system for connection of three or less line-voltage branch circuits@ not including the main disconnect@ may optionally be evaluated in accordance with the requirements in Part II of this standard@ or with the applicable requirements for a Class CTL panelboard in the Standard for Panelboards@ UL 67. Power converter systems and power inverter systems also employ circuitry as described in 1.4 and 1.5. A power-converter or power-inverter system provided with more than three line-voltage branch circuits@ not including the main disconnect@ is investigated to the applicable requirements for a Class CTL panelboard in the Standard for Panelboards@ UL 67. Converters and inverters incorporating provisions for the connection of more than three line-voltage branch circuits are judged under the requirements in Part I of this standard and the applicable requirements for a Class CTL panelboard in accordance with the Standard for Panelboards@ UL 67. Each pole of a multiple-pole circuit breaker is a separate circuit.