Designer and electrician assistance

Тable1. Permissible continuous current for wires and shunts with rubber and PVC isolation with copper cores

Electric conductor section, mm2	Current, А, for wires, laid
	Opened	In one tube
	Opened	Two one-core	Three one-core	Four one-core	One two-core	One three-core
0,5	11	-	-	-	-	-
0,75	15	-	-	-	-	-
1	17	16	15	14	15	14
1,2	20	18	16	15	16	14,5
1,5	23	19	17	16	18	15
2	26	24	22	20	23	19
2,5	30	27	25	25	25	21
3	34	32	28	26	28	24
4	41	38	35	30	32	27
5	46	42	39	34	37	31
6	50	46	42	40	40	34
8	62	54	51	46	48	43
10	80	70	60	50	55	50
16	100	85	80	75	80	70
25	140	115	100	90	100	85
35	170	135	125	115	125	100
50	215	185	170	150	160	135
70	270	225	210	185	195	175
95	330	275	255	225	245	215
120	385	315	290	260	295	250
150	440	360	330	-	-	-
185	510	-	-	-	-	-
240	605	-	-	-	-	-
300	695	-	-	-	-	-
400	830	-	-	-	-	-

Таble 2. Permissible continuous current for wires and shunts with rubber and PVC isolation with aluminum cores

Electric conductor section, mm2	Current, А, for wires, laid
	Opened	In one tube
	Opened	Two one-core	Three one-core	Four one-core	One two-core	One three-core


2	21	19	18	15	17	14
2,5	24	20	19	19	19	16
3	27	24	22	21	22	18
4	32	28	28	23	25	21
5	36	32	30	27	28	24
6	39	36	32	30	31	26
8	46	43	40	37	38	32
10	60	50	47	39	42	38
16	75	60	60	55	60	55
25	105	85	80	70	75	65
35	130	100	95	85	95	75
50	165	140	130	120	125	105
70	210	175	165	140	150	135
95	225	215	200	175	190	165
120	295	245	220	200	230	190
150	340	275	255	-	-	-
185	390	-	-	-	-	-
240	465	-	-	-	-	-
300	535	-	-	-	-	-
400	645	-	-	-	-	-

Таble 3. Permissible continuous current for wires with copper cores with rubber isolation in metal protecting covers and cables with copper cores with rubber isolation in lead, PVC, nairit and rubber cover, armoured and non-armoured

Electric conductor section, mm2	Current *, А, for wires and cables
	One-core	Two-core		Three-core
	Laying
	In air	In air	Underground	In air	Underground
1,5	23	19	33	19	27
2,5	30	27	44	25	38
4	41	38	55	35	49
6	50	50	70	42	60
10	80	70	105	55	90
16	100	90	135	75	115
25	140	115	175	95	150
35	170	140	210	120	180
50	215	175	265	145	225
70	270	215	320	180	275
95	325	260	385	220	330
120	385	300	445	260	385
150	440	350	505	305	435
185	510	405	570	35	500
240	605	-	-	-	-

*Currents refer to wires and cables with or without zero core.

Table 4. Permissible continuous current for cables with aluminum cores or plastic isolation in lead, PVC and robber covers, armoured and non-armoured

Electric conductor section, mm2	Current , А, for cables
	One-core	Two-core		Three-core
	Laying
	In air	In air	Underground	In air	Underground
2,5	23	21	34	19	29
4	31	29	42	27	38
6	38	38	55	32	46
10	60	55	80	42	70
16	75	70	105	60	90
25	105	90	135	75	115
35	130	105	160	90	140
50	165	135	205	110	175
70	210	165	245	140	210
95	250	200	295	170	255
120	295	230	340	200	295
150	340	270	390	235	335
185	390	310	440	270	385
240	465	-	-	-	-

Table 5. Permissible continuous current for transferable hose light and medium cords, transferable hose heavy cables, shaft flexible hose, searchlight cables and transferable wires with copper cores

Electric conductor section, mm2	Current *, А, for cords, wires and cables
Electric conductor section, mm2	One-core	Two-core	Three-core
0,5	-	12	-
0,75	-	16	14
1,0	-	18	16
1,5	-	23	20
2,5	40	33	28
4	50	43	36
6	65	55	45
10	90	75	60
16	120	95	80
25	160	125	105
35	190	150	130
50	235	185	160
70	290	235	200

*Currents refer to cords, wires and cables with or without zero core.

Table 6. Permissible continuous current for transferable hose cables with copper cores and rubber isolation for turf processing enterprises

Electric conductor section, mm2	Current *, А, for cables with voltage, kV
Electric conductor section, mm2	0,5	3	6
6	44	45	47
10	60	60	65
16	80	80	85
25	100	105	105
35	125	125	130
50	155	155	160
70	190	195	-

*Currents refer to cables with or without zero core.

Table 7. Permissible continuous current for hose cables with copper cores and rubber isolation for movable collectors

Electric conductor section, mm2	Current *, А, for cables with voltage, kV		Electric conductor section, mm2	Current *, А, for cables with voltage, kV
Electric conductor section, mm2	3	6	Electric conductor section, mm2	3	6
16	85	90	70	215	220
25	115	120	95	260	265
35	140	145	120	305	310
50	175	180	150	345	350

*Currents refer to cables with or without zero core.

Table 8. Permissible continuous current for wires with copper cores with rubber isolation for electrified transport 1,3 and 4 kV

Electric conductor section, mm2	Current, А	Electric conductor section, mm2	Current, А	Electric conductor section, mm2	Current, А
1	20	16	115	120	390
1,5	25	25	150	150	445
2,5	40	35	185	185	505
4	50	50	230	240	590
6	65	70	285	300	670
10	90	95	340	350	745

Table 9. Reducing coefficient for wires and cables laid in casings

Laying type	Number of laid wires and cables		Reducing coefficient for wires and cables, feeding
Laying type	One-core	Multi-core	Separate collectors with usage coefficient up to 0,7	Groups of collectors and separate collectors with usage coefficient more than 0,7
Multi-layered and in bundles	-	Up to 4	1,0	-
	2	5-6	0,85	-
	3-9	7-9	0,75	-
	10-11	10-11	0,7	-
	12-14	12-14	0,65	-
	15-18	15-18	0,6	-
One-layered	2-4	2-4	-	0,67
One-layered	5	5	-	0,6

When more than 4 simultaneously loaded wires are laid in pipes, casings, and trays in bundles, currents for the wires should be taken from Table 1 and 2 for both for wires laid open (in air), with the introduction of reducing coefficients of 0.68 for 5 and 6; 0.63 for 7-9 and 0.6 for the 10-12 wires.

For wires of secondary circuits the reducing coefficients are not applied. Permissible continuous current for wires laid in trays, in one-row strip (not in bundles) should be taken as for the wires laid in the air.

Permissible continuous current for wires and cables laid in casings, should be taken from Tab. 1-5, as for single wires and cables laid open (in air), with reducing coefficients as shown in Table. 9.

When you choose reducing coefficients, control and reserve wires and cables are not taken into account.

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