Low-voltage switchgear and controlgear - Ancillary equipment. PCB terminal blocks for copper conductorsWhat is this standard about? This part of IEC 60947 7 specifies requirements for PCB terminal blocks primarily intended for industrial or similar use. Mounting and fixing on the printed circuit board is made by soldering, press in or equivalent methods to provide electrical and mechanical connection between copper conductors and the printed circuit board. This document applies to PCB terminal blocks intended to connect copper conductors, with or

either through poor manufacturing techniques or lack of strength

and constructing below ground structures

some information on materials for particular environments is given in Annex E

To list the methods by which crossings should be identified and traced

This part of BS 1139 supersedes BS 1139-6:2005

1 % for speed of sound

11 Factory acceptance tests

Part 7: Requirements for display with reflections

frequency-modulated tones or other narrow-band test signals presented by means of one or more loudspeakers

location and complexity

Such concepts are often represented according to various ad‑hoc conventions

l)        The wedge tensile test and hardness test have been improved