PANEL BOARD WIRING-Wiring accessories & Wiring methods
Wiring accessories required are:
•PVC channel /Race way
•DIN rail
•G Channel
•Terminal connector
•Wire ferrule
•Lugs and thimble
•Cable binding strap & button
•Nylon cable tie
•Sleeves
•Grommets
•Wire clip &
Rotary switch
1 PVC channel /Race way
It is an inspection type PVC enclosed channel which provides a pathway for electrical wiring inside the panel. It has the opening slots on both sides to facilitate the good ventilation and visual inspection.
It protects the wires from dust, humidity, corrosion, water intrusion, heat, mechanical damage & physical threats.
2 DIN rail
It is a zinc-plated or chromated metal rail which is used for mounting control accessories like MCB, contactors & OLR etc, without using screws inside the panel.
3 G Channel
It is a zinc-coated metal channel, especially used for mounting the feed through or spring load or double deck terminal connectors without using screw inside the panel.
4 Terminal connectors
It is the set of insulated screw terminals at both sides used to connect the accessories with external control switches, limit switches, input supply & motor terminals etc. Terminal connectors with barrier strips & clamping plates provide a tight and electrically sound termination. It is available in various size, current & voltage ratings.
5 Wire ferrules
It is a small circular ring made up of polymer plastics or rubber or fibre, used to easily identify the ends of wires which are to be connected into a particular terminals or accessories. It should be inserted on the both ends of a wire as collar or bracelet. It is available is different size like 1 sq.mm, 1.5 sq.mm and 2.5 sq.mm etc generally in yellow colour printed with either numerical or alphabet letters on it.
6 Lugs and thimbles
It is a cylindrical barrel along with circular rings or cylindrical rod or U shape or flat surface made up of aluminium or copper or brass, used to ensure the sound electric connection of the cable/wire on to the terminals. It prevents flare out of stripped and stranded cable, increase the conductivity of the connection, support the cable/wire and avoid the loose connection and sparking. Suitable crimping tool has to be used to connects them with wires. It is available in different size like 1 sq.mm, 4 sq.mm, 25 sq.mm, 70 sq.mm, 125 sq.mm and so on.
7 Cable binding straps and button
It is made up of PVC or polymer belt with a small hole at regular intervals, used to tie up, bunching, binding and dressing the cable/wires with help of buttons. It is reusable and good insulator to the heat and electricity. It is generally available 8mm, 10 mm and 12 mm width.
8 Nylon cable ties
It is a type of fastener used to hold or tie or bunch the wires/cable or group of cables. It is made of nylon tape or belt which has teeth that will engage with head of the pawl to form a ratchet and tightens the wires. In general, the tie cannot be loosened, or removed or reused. However, some reusable ties are also available. It is available in different colour, length and width. Because of its low cost and easy to use, it is widely used in general purpose application also.
9 Sleeves
It is flexible cylindrical insulator into which the electric wire or cable or group of cables can be inserted. Apart from the electrical insulation and easy identification of wires, it also protects the wires from abrasion, heat, chemical, physical damage and radio interference. It is available is different colour, style, materials like carbon fibre, fabrics, Teflon, fibre glass, nylon, poly ethylene (PET) wrap, braided metal and heat shrink sleeves.
10 Grommets
It is a type of bushing which is used to insulate and hold the cables when they pass through a punched/drilled hole of panels or enclosures. It is generally made of rubber, plastic, plastic coated metal and protect the cable from twist, tug, cut, break, strain, vibration etc and prevent the entry of dirt, dust, water, insects and rats into the panel. It may also call as glands.
11 Wire clips
It is a type of fixing or fastening device which is used to fix and hold the cables or punch of cables in a secure manner.
12 Rotary switches
Rotary switches are most commonly used in lathes, milling and drilling machines due to their exact visual position and easiness in operation. These switches are operated by levers or knobs. The cams and blocks inside it are made of hard P.V.C. and are designed to withstand many operations. These can do a number of functions, such as ON/OFF switch, manual Forward/Reverse operation, Manual star delta switches, Pole changing switches etc.
Steps of control panel wiring:
1.Layout
2.Marking
3.Drilling & Cutting
4.Mounting
5.Routing
7.Bunching
8.Test
*This video is helpful for #ITI #Electrician #Diploma #Degree #Electrical #Engineering #Electrical #EEE #Wireman #Lineman #Technician & persons who want to enhance their electrical #knowledge and #skill.
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