UL 1558 low-voltage switchgear is a metal-enclosed power distribution assembly designed for centralized control, protection, and management of high-capacity electrical systems. It is widely used in data centers, industrial plants, utility facilities, hospitals, commercial complexes, and other mission-critical applications.
The switchgear incorporates drawout UL 1066 low-voltage power circuit breakers, main busbars, electronic trip units, digital metering, and control systems. Depending on the project, it can provide LSI or LSIG protection, Main-Tie-Main control, ZSI, maintenance-mode protection, power monitoring, and communication functions.
Its compartmentalized and modular construction supports system expansion, selective coordination, inspection, and maintenance. Compared with general-purpose switchboards, UL 1558 switchgear is better suited to applications requiring service continuity, short-time withstand capability, and advanced protection and control. Final ratings and certification claims are subject to the approved product configuration and certification scope.
| 方面 | UL 1558 Standard 技术选项 | IEC 61439-1/2 标准 技术选项 |
| 标准 | UL 1558, CSA C22.2 No. 31, NEC (NFPA 70),IEEE C37.20.1，ANSI/IEEE C37.51 | IEC 61439-1/2, EC 60947-2, IEC 60909, IP Ratings |
| 额定电压 | 600V, 480V, (Up to 1000V DC/AC) | |
| 额定电流 | 1000A, 1200A, 1600A, 2000A, 2500A, 3200A, 4000A, 5000A, 6000A | 1000A、1250A、1600A、2000A、2500A、3150A/3200A、4000A、5000A、6300A（可定制至8000A） |
| 频率 | 50Hz / 60Hz（兼容全球通用频率 (50/60Hz)） | |
| 系统类型 | 三相三线 (3P3W) / 三相四线 (3P4W) （可选中性母线（可提供带或不带中性线的配置）。 | |
| SCCR 和 ICW | 65kA、85kA、100kA、150kA、200kA（@415V/480V） | 50kA、65kA、85kA、100kA、150kA（@415V/480V） |
| 母线材料 | 镀锡/镀银铜（标准镀锡或镀银表面处理，具有优异的抗氧化性。） | |
| 外壳额定值 | 1号，3R号，4X号 | IP54、IP65 |
| 尺寸（高×宽×深） | 可变外壳尺寸，针对不同的电流额定值进行了优化。 | |
| 电缆入口 | 顶部和底部电缆入口或出口可定制，安装灵活。 | |
| 外壳材料 | 优质镀锌钢板。/ SS304不锈钢 | |
| 布雷克品牌 | Schneider、ABB、Eaton、Siemens、LS、Noark 或 KAILES 标准 | |
| 智能监控 | 带谐波分析和Modbus/TCP通信功能的智能电能表 | |
Provide the working-space depth required by NEC Table 110.26(A)(1), based on the system voltage-to-ground and the condition opposite the switchgear.
For typical systems rated 151–600 V to ground:
Condition 1: Minimum 3 ft (0.91 m)
Condition 2: Minimum 3.5 ft (1.07 m)
Condition 3: Minimum 4 ft (1.22 m)
For systems rated 150 V or less to ground, the minimum depth is generally 3 ft. Final clearance must be verified against the locally adopted NEC edition and site conditions.
The working-space width must be at least 30 inches (762 mm) or the width of the switchgear, whichever is greater. Equipment doors and hinged panels must be capable of opening at least 90 degrees.
The clear working-space height must be at least 6 ft 6 in (1.98 m) or the height of the switchgear, whichever is greater.
Where switchgear rated 1200 A or more and wider than 6 ft (1.83 m) meets the conditions of NEC 110.26(C)(2), an entrance to and egress from the working space is generally required at each end.
Applicable NEC exceptions may permit a single entrance where the working-space depth is increased or where an unobstructed exit path is provided. Final room layout must be approved according to the locally adopted code.
Where the applicable conditions of NEC 110.26(C)(3) are met for equipment rated 800 A or more, personnel doors located within the specified distance of the working space must:
Open in the direction of egress;
Be equipped with listed panic hardware or listed fire-exit hardware;
Provide a clear and unobstructed escape path.
This requirement is conditional and should not be described as mandatory for every UL 1558 installation.
For indoor installations, provide dedicated electrical space equal to the width and depth of the switchgear, extending from the floor to 6 ft (1.83 m) above the equipment or to the structural ceiling, whichever is lower.
Foreign systems such as water piping, drainage piping, and HVAC ducts should not be installed within this dedicated zone. Code-compliant sprinkler protection may be permitted when installed in accordance with the applicable NEC requirements.
For rear-access switchgear, provide the rear working space required for the actual maintenance activity:
If examination, adjustment, servicing, or maintenance may expose energized parts, apply the working-space requirements of NEC 110.26;
If rear access is required only for nonelectrical parts, provide at least 30 inches (762 mm) of horizontal working space where required;
Follow the manufacturer’s drawings for escape aisles, cable access, ventilation, and door clearances.
Front-access-only switchgear may be installed closer to a wall only when permitted by the listed equipment design and manufacturer’s instructions. Install the lineup on a level concrete pad and anchor it according to the approved seismic and structural requirements.
致力于为客户提供智能、安全、可靠的配电解决方案。
