UL 887:2018-06 Delayed-Action Timelocks.
1.1 These requirements cover delayed-action timelocks intended for attachment on the doors of safes, chests, vaults, and the like, to provide a means for locking the door for a predetermined length of time as protection against burglary or robbery or both.
1.2 The timelocks covered by these requirements may be automatic, manual, or both, in operation
depending upon their design. Automatic devices can be factory set to a fixed minimum time delay of 5
minutes. Manual devices are generally set by the user with a key or similar device to provide delays of
120 hours or more. Some designs may include both the automatic delay feature for interior robbery
protection and the manual delay feature for burglary protection.
1.3 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.
2.1.1 Except as indicated in 2.1.2, a component of a product covered by this standard shall comply with the requirements for that component.
2.1.2 A component is not required to comply with a specific requirement that:
a) Involves a feature or characteristic not required in the application of the component in the product covered by this standard, or
b) Is superseded by a requirement in this standard.
2.1.3 A component shall be used in accordance with its rating established for the intended conditions of use.
2.1.4 Specific components are incomplete in construction features or restricted in performance capabilities. Such components are intended for use only under limited conditions, such as certain temperatures not exceeding specified limits, and shall be used only under those specific conditions.UL 887 pdf download.