UL891 Switchboards

UL891: Safety Basis for Switchboards of Commercial and Industrial

In the field of LV power distribution, safety and reliability are the fundamental of application. UL891, as globally recognized standard for Switchboards, is the core principle to guarantee basic safety of power distribution device. Since we obtain UL Factory Certification in 2014, we consistently integrate core element of UL891 into design & manufacture of Switchboards to provide you trustworthy solutions of power distribution.

A, What is UL891?

UL891 is the standard for switchboards developed by UL. It applies to switchboards normally rated at 600V AC/DC or less and intended for office building, industrial facilities and public facility.

UL891 Core Orientation:

· UL891 Standard is the specification of Switchboards intended for primary power distribution and secondary power distribution.

· By contrast with UL1558 (Metal-Enclosed Low-Voltage Power Circuit Breaker Switchgear), UL891 place emphasis on basic safety, structural integrity and electric protection. It is extensively applied entry-level industrial standard.

· UL891 Standard guarantees LV Switchboard is able to provide equipment and personal basic safety under normal or abnormal circumstances.

In brief, LV Switchboard with UL891 Certification is “Safety and Qualified Product” compliance with international market access conditions.

B, UL891 Core Requirement illumination- Exhibition of Professional and Safe

1. Structural Strength and Material

o Requirement: Enclosure fabrication must utilize sufficient mechanical strength and stiffness, capable of bearing mechanical stress during normal operation and installation, and durable metal.

o Exhibition of Professional: Our LV Switchboard utilize superior cold-rolled steel and reinforcing bar to eliminate risk of enclosure deformation during shipping, installation and long-term operation, and provide internal components secure protection.

2. Internal Wiring and Connection:

o Requirement: Internal wiring must be properly selected, properly installed, and sufficiently supported and secured. Ampacity and insulation of busbar must comply with the specification of UL891 Standard.

o Exhibition of Professional: We comply with ampacity requirement of wire size, utilize wiring troughs and wire ties to implement wiring, and guarantee reliable connection to eliminate fault due to loose and overheating.

3. Overcurrent Protection Coordination

o Requirement: Internal Ratings and interrupting capacity of circuit breaker or other overcurrent protective components in the Switchboard must be coordinated with upstream power supply and load side be properly selected.

o Exhibition of Professional: We apply precise short-circuit calculation and discriminative protection analysis, and select proper protective components to guarantee LV Switchboard can accurately and immediately interrupt fault circuit, and prohibit fault expansion

4. Clearance and Creepage Distance

o Requirement: Specify minimum clearance between live parts of different potential or live parts and grounding metal to prohibit arc and short-circuit.

o Exhibition of Professional: We comply with the clearance requirements to implement proper layout design and eliminate the risk of disruptive discharge, particularly under humid and dusty industrial environment.

5. Mark and Label

o Requirement: Switchboard must include clear and permanent nameplate, wiring diagrams, warning symbol and critical information such as rated voltage, rated current, short-circuit current rating (SCCR), etc.

o Exhibition of Professional: We provide detailed nameplate and internal wiring diagrams of Chinese-English bilingual, besides to comply with UL891 Standard, is to conduct safe and convenient maintenance, expansion and troubleshooting.

C, Why is choosing switchboard with UL891 certification essential?

Choosing LV Switchboard with UL891 Certification Mark is by no means a metal box. It represents:

· Basic Security Assurance: It passed the rigorous test and verification of Third-party Authoritative Institution, and built basic security defensive line.

· Quality Consistency Commitment‌: As UL Certification Factory, our manufacturing process and QMS is consistently inspected by UL to guarantee our product comply with UL standard.

· Market Access Certification‌: It is a mandatory or prioritized requirement for the product going to North American Market and International Market.

· Exhibition of Risk Management‌: In the event of an electrical incident, use of certified products is to verify you have performed duty of due diligence, and clarify and reduce legal liability.

UL891 is indispensable security bottom line in the field of LV power distribution. As UL Certification Factory, we guarantee Switchboard comply with UL Standard, besides we provide exceeding standard, cost-effective and applicable power distribution solution.

Choosing professional is choosing peace of mind. We guarantee to deliver authoritative and certified LV Switchboard to escort your power system.