UL 60947-7-1:2021 PDF Download

UL 60947-7-1:2021 is a standard that provides specifications for terminal blocks used in low-voltage switchgear and controlgear. These terminal blocks are designed to provide electrical and mechanical connections between copper conductors. The standard applies to terminal blocks that can connect round copper conductors with a cross-section ranging from 0.2 mm² to 300 mm² (AWG 24/600 kcmil). These terminal blocks are intended to be used in circuits with rated voltages not exceeding 1,000 V AC up to 1,000 Hz or 1,500 V DC.

The standard also covers various types of terminal blocks, including those that require special devices for connection, those that have direct contact with conductors through edges or points penetrating the insulation, and special types such as disconnect terminal blocks. Clamping units, which are the mechanisms used to secure the conductors in the terminal blocks, are referred to as "clamping units" in this standard, instead of the term "terminals," as specified in IEC 60947-1.

The standard also includes modifications that align it with specific national electrical codes such as the National Electrical Code (NFPA 70) for use in the USA, the Canadian Electrical Code, Part I (CSA C22.1-15) for use in Canada, and the Electrical Installations (Utility) (NOM-001-SEDE) for use in Mexico. These modifications specify the wire range for terminal blocks, which covers 0.051 mm² to 1,010 mm² copper conductors (30 AWG to 2,000 kcmil) and 3.31 mm² to 1,010 mm² aluminum conductors (12 AWG to 2,000 kcmil). The standard also indicates any restrictions on specific aluminum conductor sizes allowed in Mexico. The voltage range covered by the standard includes up to 1,500 V AC and 1,500 V DC.