UL - 512 BULLETIN
UL Standard for Safety Fuseholders
|Publication Date:||5 May 2010|
These requirements cover:
a) Fuseholders for Edison-base and Type S plug fuses,
b) Fuseholders for Class CC, G, H, J, K, R, and T cartridge fuses, and
c) Devices to adapt Type S plug fuses for use in Edison-base fuseholders.
These fuseholders and devices are intended to accommodate fuses to be employed in lighting and power circuits in accordance with the National Electrical Code.
These requirements do not cover fused attachment plugs, car-lighting cutouts, protective devices designed for signaling systems or instruments, or fuseholders for link fuses.
A CTL (circuit-limiting) fuseholder is one having such physical
size or configuration that, in conjunction with the physical means
provided in a Class CTL panelboard or other device, installation of
Except as noted in 1.5, a device that has provision for connection to the conductors of more than four circuits, other than the supply circuit or a continuation thereof, is considered to be and judged as a panelboard rather than as a fuseholder.
A device that has:
a) Provision for connection to more than four but not more than 12 branch circuits,
b) Receptacles for plug fuses only, and
c) Been designed specifically for use in an enclosed branch-circuit cutout is considered to be and is judged as a fuseholder.
A fuseholder that has been designed specifically for use in an enclosed branch-circuit cutout or in a panelboard assembly is judged with respect to the intended application as well as being judged under the requirements in this standard.
A product that contains features, characteristics, components, materials, or systems new or different from those covered by the requirements in this standard, and that involves a risk of fire or of electric shock or injury to persons shall be evaluated using appropriate additional component and end-product requirements to maintain the level of safety as originally anticipated by the intent of this standard. A product whose features, characteristics, components, materials, or systems conflict with specific requirements or provisions of this standard does not comply with this standard. Revision of requirements shall be proposed and adopted in conformance with the methods employed for development, revision, and implementation of this standard.