tailieunhanh - Industrial Control Wiring Guide 2E Episode 8

Tham khảo tài liệu 'industrial control wiring guide 2e episode 8', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 6. CONNECTIONS AND ROUTING Terminals and terminal blocks should be clearly marked and identified to correspond to the markings in the drawings. Ensure that identification tags and cable markers are legible marked with a permanent ink and suitable for the environment where the panel is to be used. They should also correspond with those shown in the machine drawings and instruction or service documentation. A means of retaining conductor strands should be provided where terminals are not equipped with this facility for example by crimping on bootlace ferrules. Do not use solder. The terminations of shielded or screened conductors should be terminated so that the screen cannot fray. If the screen is to be connected then make it off in the same way as for coaxial cable with a soldered pigtail and a sleeve. If it is not to be connected then trim it back as far as possible and cover it with a sleeve. 64 6. CONNECTIONS AND ROUTING Terminal blocks should be mounted and wired so that the internal and external wiring does not cross over the terminals. Flexible conduits and cables should be installed in such a way that liquids can drain away from fittings and terminations. 65 6. CONNECTIONS AND ROUTING . Conductor and cable runs Conductors and cables should run from terminal to terminal without any intervening joins. This refers to making a joint in the middle of a wire or cable. If it is necessary for any reason then use a suitable connector or terminal block. Don t use a twisted and soldered joint. Extra length should be left at connectors where the cable or cable assembly needs to be disconnected during maintenance or servicing. Multicore cable terminations should be adequately supported to avoid undue strain on the conductor terminations. The protective conductor should as far as is possible be routed close to the associated live conductors to avoid undue loop resistance. .