UL 3801 OUTLINE
UL Outline for Investigation Fault Limiters
|Publication Date:||29 June 2018|
These requirements cover fault limiters intended to sense and interrupt high magnitude overcurrent conditions in a prescribed range of short circuit current values, limiting both the time and peak current of the short circuit. Fault Limiters open the circuit within an interval equal to or less than the first major or symmetrical current loop duration; limiting the peak current to a value less than the available peak current.
Fault Limiters may be designed such that the interrupting portions are field replaceable.
These requirements cover Fault Limiters rated up to 1000 V ac maximum.
These requirements are intended to be used in conjunction with the requirements in the Standard for Low-Voltage Fuses - Part 1, General Requirements, UL 248-1, hereafter referred to as UL 248-1, except as modified or supplemented by this Outline of Investigation, hereafter referred to as Outline.
This Outline does not include the requirements for devices that sense and interrupt overcurrent conditions solely by use of a current responsive element. Requirements for these types of devices can be found in the UL 248 Series of Fuse Standards.
Devices covered by this Outline are not intended to be used as branch circuit overcurrent protection.
Fault Limiters are intended for installation in switchgear, switchboards, and the like or in locations accessible only to qualified personnel in accordance with the NFPA 70, "National Electric Code" (NEC). The acceptability of the combination of a Fault Limiter with respect to any end product shall be determined as part of the end-product evaluation.
This standard does not cover effects of excessive sound or pressure.