Cable Laying Precautions

In which case is the cable laid in a pipe?

Pipe laying is generally used where it intersects with other buildings. roads or railways, and sometimes in densely populated areas.

What are the advantages of laying in cable ducts?

The main advantage is that it occupies less space and can withstand large loads. The cables do not affect each other and are safer.

How many cables are laid?

1. buried directly in the ground.
2. installed in the cable trench.
3. installed in an underground tunnel.
4. Installed on the inner wall of the building or on the ceiling.
5. installed on the bridge.
6. laid in the discharge pipe.
7. Laying on the bottom of the water.

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What is the calculation method for cable size?

How to calculate the cable size (mm²)

The wire size is a standard value specified by the standard. The wire size is actually the cross-sectional area of the wire, that is, the area of the circular cross-section of the wire, in units of mm². It is the user who selects the wire and cable according to the load of the wire and cable.

There are three standards commonly used internationally for wire sizes and dimensions: American (AWG), Imperial (SWG) China (CWG), and Imperial (SWG).

How do you see the size of the wire and cable?

What does size mean?

The size is a nominal value specified by international standards, and the size is the user selects the wire and cable according to the load of the wire and cable.

Cable size is a verbal term in construction. It is often said that the cable is mm, but actually refers to mm².

The wire size is actually the cross-sectional area of ​​the wire, which is the area of ​​the circular cross-section of the wire, in mm².

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SWA armored cable size table

SWA armored cable size table

2-core armored cable core technical parameters

Cores x conductor cross-section	Conductor construction	External diameter	Insulation thickness	Sheath thickness	Conductor resistance at 20 °C	Cu weight	Cable weight
	nominal	approx.	nominal	nominal	max.		approx.
N x mm²	n x mm	mm	mm	mm	Ω/km	kg/km	kg/km
2 x 1,5	1 x 1,37	13,3	0,8	1,8	12,1	28,8	346
2 x 2,5	1 x 1,74	14,1	0,8	1,8	7,41	48	397
2 x 4	1 x 2,2	16,5	1	1,8	4,61	76,8	598
2 x 6	1 x 2,7	17,5	1	1,8	3,08	115,2	692
2 x 10	7 x 1,34	19,9	1	1,8	1,83	192	904
2 x 16	7 x 1,70	22,1	1	1,8	1,15	307,2	1143
2 x 25	7 x 2,13	26	1,2	1,8	0,727	480	1600
2 x 35	7 x 2,52	28,4	1,2	1,9	0,524	672	1925

3-core armored cable core technical parameters

Cores x conductor cross-section	Conductor construction	External diameter	Insulation thickness	Sheath thickness	Conductor resistance at 20 °C	Cu weight	Cable weight
	nominal	approx.	nominal	nominal	max.		approx.
N x mm²	n x mm	mm	mm	mm	Ω/km	kg/km	kg/km
3 x 1,5	1 x 1,37	13,8	0,8	1,8	12,1	43,2	378
3 x 2,5	1 x 1,74	14,7	0,8	1,8	7,41	72	439
3 x 4	1 x 2,2	17,2	1	1,8	4,61	115,2	667
3 x 6	1 x 2,7	18,3	1	1,8	3,08	172,8	779
3 x 10	7 x 1,34	20,9	1	1,8	1,83	288	1029
3 x 16	7 x 1,70	24	1	1,8	1,15	460,8	1459
3 x 25	7 x 2,13	27,3	1,2	1,8	0,727	720	1900
3 x 35	7 x 2,52	29,9	1,2	1,9	0,524	1008	2325
3 x 25+16	7 x 2,13	32	1,2 / 1,0	2	0,727	873,6	-
3 x 35+16	7 x 2,52	36	1,2 / 1,0	2,2	0,524	1161,6	-
3 x 50+25	19 x 1,83	36	1,4 / 1,2	2,2	0,387	1680	-
3 x 70+35	19 x 2,17	39	1,4 / 1,2	2,2	0,268	2352	-
3 x 95+50	19 x 2,52	43,5	1,6 / 1,4	2,2	0,193	3216	-
3 x 120+70	37 x 2,03	48	1,6 / 1,4	2,6	0,153	4128	-
3 x 150+70	37 x 2,27	52,5	1,8 / 1,4	2,6	0,124	4992	-
3 x 185+95	37 x 2,52	57,5	2,0 / 1,6	3	0,0991	6240	-
3 x 240+120	61 x 2,24	65	2,2 / 1,6	3	0,0754	8064	-
3 x 300+150	61 x 2,50	72	2,4 / 1,8	3,4	0,0601	10080	-

4-core armored cable core technical parameters

Cores x conductor cross-section	Conductor construction	External diameter	Insulation thickness	Sheath thickness	Conductor resistance at 20 °C	Cu weight	Cable weight
	nominal	approx.	nominal	nominal	max.		approx.
N x mm²	n x mm	mm	mm	mm	Ω/km	kg/km	kg/km
4 x 1,5	1 x 1,37	14,6	0,8	1,8	12,1	57,6	426
4 x 2,5	1 x 1,74	16,4	0,8	1,8	7,41	96	603
4 x 4	1 x 2,2	18,3	1	1,8	4,61	153,6	765
4 x 6	1 x 2,7	19,5	1	1,8	3,08	230,4	900
4 x 10	7 x 1,34	23,1	1	1,8	1,83	384	1326
4 x 16	7 x 1,70	25,8	1	1,8	1,15	614,4	1729
4 x 25	7 x 2,13	29,8	1,2	1,9	0,727	960	2235
4 x 35	7 x 2,52	33,3	1,2	2	0,524	1344	2910
4 x 50	19 x 1,83	37,1	1,4	2,1	0,387	1920	3185
4 x 70	19 x 2,17	42,7	1,4	2,3	0,268	2688	4845
4 x 95	19 x 2,52	47,4	1,6	2,5	0,193	3648	6145
4 x 120	37 x 2,03	49,7	1,6	2,5	0,153	4608	7255
4 x 150	37 x 2,27	55	1,8	2,7	0,124	5760	9155
4 x 185	37 x 2,52	58,8	2	2,9	0,0991	7104	11170
4 x 240	61 x 2,24	65,9	2,2	3	0,0754	9216	14420
4 x 300	61 x 2,50	73,2	2,4	3,3	0,0601	11520	17820

5-core armored cable core technical parameters

Cores x conductor cross-section	Conductor construction	External diameter	Insulation thickness	Sheath thickness	Conductor resistance at 20 °C	Cu weight	Cable weight
	nominal	approx.	nominal	nominal	max.		approx.
N x mm²	n x mm	mm	mm	mm	Ω/km	kg/km	kg/km
5 x 1,5	1 x 1,37	16,3	0,8	1,8	12,1	72	581
5 x 2,5	1 x 1,74	17,4	0,8	1,8	7,41	120	673
5 x 4	1 x 2,2	19,6	1	1,8	4,61	192	869
5 x 6	1 x 2,7	20,9	1	1,8	3,08	288	1027
5 x 10	7 x 1,34	24,8	1	1,8	1,83	480	1537
5 x 16	7 x 1,70	28,2	1	1,8	1,15	768	2009
5 x 25	7 x 2,13	33,1	1,2	2	0,727	1200	2885
5 x 35	7 x 2,52	36,8	1,2	2,2	0,524	1680	3610

Multi-core armored cable core technical parameters

Cores x conductor cross-section	Conductor construction	External diameter	Insulation thickness	Sheath thickness	Conductor resistance at 20 °C	Cu weight	Cable weight
	nominal	approx.	nominal	nominal	max.		approx.
N x mm²	n x mm	mm	mm	mm	Ω/km	kg/km	kg/km
7 x 1,5	1 x 1,37	17,2	0,8	1,8	12,1	100,8	652
8 x 1,5	1 x 1,37	18,64	0,8	1,8	12,1	115,2	726
9 x 1,5	1 x 1,37	19,74	0,8	1,8	12,1	129,6	792
10 x 1,5	1 x 1,37	20,34	0,8	1,8	12,1	144	845
12 x 1,5	1 x 1,37	20,84	0,8	1,8	12,1	172,8	909
14 x 1,5	1 x 1,37	22,3	0,8	1,8	12,1	201,6	1108
16 x 1,5	1 x 1,37	23,2	0,8	1,8	12,1	230,4	1199
19 x 1,5	1 x 1,37	24,1	0,8	1,8	12,1	273,6	1298
21 x 1,5	1 x 1,37	25,2	0,8	1,8	12,1	302,4	1392
24 x 1,5	1 x 1,37	27,2	0,8	1,8	12,1	345,6	1553
27 x 1,5	1 x 1,37	27,7	0,8	1,8	12,1	388,8	1641
30 x 1,5	1 x 1,37	28,7	0,8	1,9	12,1	432	1773
37 x 1,5	1 x 1,37	30,5	0,8	1,9	12,1	532,8	2023
40 x 1,5	1 x 1,37	31,8	0,8	2	12,1	576	2157
7 x 2,5	1 x 1,74	18,44	0,8	1,8	7,41	168	773
8 x 2,5	1 x 1,74	20,04	0,8	1,8	7,41	192	871
9 x 2,5	1 x 1,74	21,24	0,8	1,8	7,41	216	949
10 x 2,5	1 x 1,74	22,6	0,8	1,8	7,41	240	1125
12 x 2,5	1 x 1,74	23,2	0,8	1,8	7,41	288	1233
14 x 2,5	1 x 1,74	24,1	0,8	1,8	7,41	336	1330
16 x 2,5	1 x 1,74	25,1	0,8	1,8	7,41	384	1444
19 x 2,5	1 x 1,74	26,1	0,8	1,8	7,41	456	1590
21 x 2,5	1 x 1,74	27,3	0,8	1,8	7,41	504	1723
24 x 2,5	1 x 1,74	29,8	0,8	1,9	7,41	576	1935
27 x 2,5	1 x 1,74	30,4	0,8	1,9	7,41	648	2055
30 x 2,5	1 x 1,74	31,3	0,8	1,9	7,41	720	2205
37 x 2,5	1 x 1,74	34,26	0,8	2	7,41	888	2773
40 x 2,5	1 x 1,74	35,66	0,8	2,1	7,41	960	2961

source:swa cable

swa cable

SWA Armored cable

Armored cables are made of different material conductors in a metal sleeve with an insulating material that is machined into a flexible, flexible assembly. The armored cable is generally a fixedly laid power cable. Generally speaking, it is fixed in one place and basically does not move, and the power line transmits electric energy. Armored cables include armored thermocouples, armored thermal resistors, armored heaters, and armored leads. They are mainly used for temperature measurement, signal transmission and special heating in chemical, metallurgical, mechanical manufacturing, power generation, and scientific experiments. It is an armored thermocouple. The armor is divided into steel belt armor (22, 23), thin steel wire armor (32, 33), and thick steel wire armor (42, 43).

The armored cable mechanical protective layer can be added to any structural cable to increase the mechanical strength of the cable and improve the corrosion resistance. It is a telephone cable designed for areas that are susceptible to mechanical damage and extreme erosion. It can be laid in any way and is more suitable for direct burial in rock areas.

The armored cable is generally a fixedly laid power cable. Generally speaking, it is fixed in one place and basically does not move, and the power line transmits electric energy.

In addition to the above, the purpose of the cable plus the armor layer can also enhance the mechanical protection such as tensile strength and compressive strength to prolong the service life.

The armor has certain anti-external force performance, and can also prevent rats from biting. It will not cause power transmission problems through armoring. The bending radius of the armor should be large, and the armor layer can be grounded to protect the cable.

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