Low-voltage cables have many specifications and models. Take indoor PVC insulated PVC sheath below 1KV as an example to illustrate the production of power cable terminal cable heads.
(2) Construction process
Measure the grounding resistance → strip the cable end → wrap the cable and sheath the terminal end of the aerial bundled cable ASTM b231 → press the cable core wire lug → connect with the equipment
(3) Main construction methods and technical measures
1) Press cable core wire lug
a. Measure the length from the end of the core wire to the depth of the wire nose, add another 5mm, strip the cable core wire insulation, and coat the core wire with petroleum jelly.
b. Insert the wire core into the wiring nose, and use crimping pliers to press the wiring nose. There should be more than two crimping holes. Large-size wiring terminals should be crimped by hydraulic machinery.
c. According to different phases, use yellow, green, red, and four-color plastic tapes to respectively wrap each core wire of the cable to the crimping part of the terminal lug.
d. Fix the cable with the terminal head on the pre-made cable head bracket, and separate the core wires.
e. According to the model of the terminal, use bolts to crimp the cable terminal on the equipment. Pay attention to the bolts from top to bottom or from the inside to the outside. Flat washers and springs should be installed.
2) Telemetry cable insulation
a. Use 1KV shaker to measure the cable, and the insulation resistance should be greater than 10MΩ.
b. After the cable shake test is completed, the core wires should be discharged to the ground respectively.
3) Wrap the cable, cover the cable terminal head cover
a. Strip the outer insulation layer of the aerial bundled cable(abc) b230 standard, and put the lower part of the cable head cover into the cable first.
According to the type and size of the cable head, according to the length and inner diameter of the cable head sleeve, wrap the cable with a plastic tape in a half-stack method. The plastic tape should be tightly wrapped, and the shape should be like a date.
c. Put the upper part of the cable head cover on, butt and cover it tightly with the lower part.
The principle of omission in the model: copper is the main conductor material used in wire and cable products, so the copper core code T is omitted, except for bare wires and bare conductor products. Bare wires and bare conductor products, power cables, and magnet wire products do not indicate major category codes, and electrical equipment wires and cables and communication cables are also not listed, but subcategory or series codes are listed.
Item 7 is a mark for various special use occasions or additional special use requirements, marked with a pinyin letter after “-“. Sometimes in order to highlight this item, write this item to the top. Such as ZR- (flame retardant), NH- (fire-resistant), WDZ- (low smoke and halogen-free, corporate standard), -TH (for hot and humid areas), FY- (termite-proof, corporate standard), etc.