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Industrial Control Wiring Guide 2 2010 Part 7

Tham khảo tài liệu 'industrial control wiring guide 2 2010 part 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 5. CABLE FORMING 5.3.2. Lacing Y breakouts There are two accepted methods for starting the lacing on the branch. Method 1. Make a starting knot on the branch and lace in the normal manner. Method 2. Tie the branch lacing to the double lock stitch before the breakout using a cable branch tie. Pull the tie tight to the double stitch then make a lock stitch on the branch close to the join and continue lacing. 54 5. CABLE FORMING 5.3.3. Lacing T breakouts There are several methods which may be used depending upon the specification. Method 1. Where there are only a couple of wires less than 12 mm diameter overall . Make a single lock stitch on both sides of the breakout. If the breakout is to be laced use a starting knot and lace as normal. Method 2. On larger breakouts more than 12 mm. Make a double lock stitch before and after the breakout. Lace the branch starting with a cable branch tie. Where the wires fan out to go to a sub-assembly or connector use a double stitch before each wire. 55 5. CABLE FORMING 5.4. Spot ties 5.4.1. Lacing cord Make these as you do a starting knot with a clove hitch and a reef knot. The knot can be sealed using adhesive or varnish. 5.4.2. Cable ties These come in several very similar shapes. All are like a belt and buckle. One side of the belt is serrated. This side goes toward the cable. The end is passed through the eye in the buckle and pulled tight. There are tools available which allow the correct tension to be obtained every time. Trim off the waste. 5.5. Laying the wires Whichever method of binding is used here are some rules to follow Prepare the wires according to the wiring schedule and lay them on to the template in the order found in the run-out sheet. Avoid kinks in the wires. Lay the wires as straight and parallel as possible. .