DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
Regulations for the UK onshore processing sectors are complex and specialist. We offer in-house training and advice to ensure you know what your responsibilities are and how the relevant regulations impact your business.
If you work in the Petrochemical industry, specific storage facilities, with explosives or in any other industry where threshold quantities of dangerous substances are kept or used, you’ll need to ensure you are compliant under the Control of Major Accident Hazards (1999) (COMAH) Regulations.
Basic training covers the following areas;
Functional Safety Compliance [IEC61511]
DSEAR/ATEX Compliance
MCERTS Compliance
All training is tailor-made to your needs and we’ll carry it out in-house so you can train as many staff as you want, without having to organise travel or transport.
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
AC Motors – full load current tables (1450rpm approx.) (provided as a guide to the selection of suitable MEM control gear). The tables are based on motors of approximately 1450rpm of average efficiency and power factor. Motors of higher speed usually take a lower current than that shown in the table; while motors of lower speed usually take higher current. Wide variations from these figures can arise, especially on single phase motors, and engineers should, whenever possible, determine the actual f.l.c from the motor rating plate in each case.
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
Current-carrying capacity Conductor cross-sectional Single-phase A.C. area
Current-carrying capacity
Maximum mass supportable by Three-phase A.C. twin flexible cord (see Regulations 522.7.2 and 559.6.1.5)
D.C. or single-phase A.C
Three-phase A.C.
mm2
A
A
kg
0.5
3
3
2
0.75
6
6
3
1
10
10
5
1.25
13
-
5
1.5
16
16
5
2.5
25
20
5
4
32
25
5
RATING FACTOR FOR AMBIENT TEMPERATURE
60ºC thermoplastic or thermosetting insulated cords:
Ambient temperature
35ºC
40ºC
45ºC
50ºC
55ºC
Rating Factor
0.91
0.82
0.71
0.58
0.41
90ºC thermoplastic or thermosetting insulated cords:
Ambient temperature
35ºC to 50ºC
55ºC
60ºC
65ºC
70ºC
Rating Factor
1
0.96
0.83
0.67
0.47
Glass fibre cords:
Ambient temperature
35ºC to 150ºC
155ºC
160ºC
165ºC
170ºC
175ºC
Rating Factor
1
0.92
0.82
0.71
0.57
0.4
180ºC thermoplastic or thermosetting insulated cords:
Ambient temperature
35ºC to 120ºC
125ºC
130ºC
135ºC
140ºC
145ºC
Rating Factor
1
0.96
0.85
0.74
0.6
0.42
VOLTAGE DROP
Table 4F3B Conductor operating temperature: 60ºC
Conductor cross-sectional area
D.C. or single-phase A.C
Three-phase A.C.
mm2
A
mV/A/m
0.5
93
80
0.75
62
54
1
46
40
1.25
37
-
1.5
32
27
2.5
19
16
4
12
10
NOTE: *The tabulated values above are for 60ºc thermoplastic or thermosetting insulated flexible cords and for other types of flexible cords they are to be multiplied by the following factors:
FOR: 90ºC thermoplastic or thermosetting insulated
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
Table 4D2A – Current Carrying Capacity in Ampere Current Rating Chart for Multicore 70°C
* with or without protective conductor. Extract from the IEE Wiring Regulations, 17th Edition 30°C Ambient Air Temperature, 90°C Conductor Operating Temperature, 30°C Ambient Ground Temperature
Conductor cross-sectional area mmu00b2
Method A - Enclosed in conduit in an insulated wall.
Method B - Enclosed in conduit on a wall or in trunking.
REFERENCE METHOD C - CLIPPED DIRECT
Method E - In free air or on a perforated cable tray.
1 two-core* cable, single
1 three-core* or 1 four-core
1 two-core* cable, single
1 three-core* or 1 four-core
1 two-core* cable, single
1 three-core* or 1 four-core
1 two-core* cable, single
1 three-core* or 1 four-core
phase A.C or D.C.
cable, three-phase A.C.
phase A.C or D.C.
cable, three-phase A.C.
phase A.C or D.C.
cable, three-phase A.C.
phase A.C or D.C.
cable, three-phase A.C.
1
11
10
13
11.5
15
13.5
17
14.5
1.5
14
13
16.5
15
19.5
17.5
22
18.5
2.5
18.5
17.5
23
20
27
24
30
25
4
25
23
30
27
36
32
40
34
6
32
29
38
34
46
41
51
43
10
43
39
52
46
63
57
70
60
16
57
52
69
62
85
76
94
80
25
75
68
90
80
112
96
119
101
35
92
83
111
99
138
119
148
126
50
110
99
133
118
168
144
180
153
70
139
125
168
149
213
184
232
196
95
167
150
201
179
258
223
282
238
120
192
172
232
206
299
259
328
276
150
219
196
258
225
344
299
379
319
185
248
223
294
255
392
341
434
364
240
291
261
344
297
461
403
514
430
300
334
298
394
339
530
464
593
497
400
-
-
470
402
634
557
715
597
Table 4D2B – Voltage drop per ampere, per metre 70°C conductor operating temperature
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
TABLE 4G1A Mineral insulated cables thermoplastic covered or bare and exposed to touch (copper conductors & sheath)
30°C Ambient Air Temperature 70°C Conductor Operating Temperature
Current Carrying Capacity (amperes)
Conductor cross-sectional area
Reference Method C (Clipped Direct)
Reference Method E, F or G
single phase AC or DC
three phase AC
single phase AC or DC
three phase AC
2 single cord cables touching or 1 2-core cable
3 single core cables in trefoil or 1 3-core or 4-core cable
3 single core cables flat and touching, horizontal or vertical
2 single cord cables touching or 1 2-core cable
3 single core cables in trefoil, or 1 3-core or 4-core cable
3 single core cables flat and touching, horizontal or vertical
3 single core cables flat & spaced by one cable diameter
vertical
horizontal
LIGHT DUTY 500V
1
18.5
15
17
19.5
16.5
18
20
23
1.5
23
19
21
25
21
23
26
29
2.5
31
26
29
33
28
31
34
39
4
40
35
38
44
37
41
45
51
HEAVY DUTY 750V
1
19.5
16
18
21
17.5
20
22
25
1.5
25
21
23
26
22
26
28
32
2.5
34
28
31
36
30
34
37
43
4
45
37
41
47
40
45
49
56
6
57
48
52
60
51
57
62
71
10
77
65
70
82
69
77
84
95
16
102
86
92
109
92
102
110
125
25
133
112
120
142
120
132
142
162
35
163
137
147
174
147
161
173
197
50
202
169
181
215
182
198
213
242
70
247
207
221
264
223
241
259
294
95
296
249
264
317
267
289
309
351
120
340
286
303
364
308
331
353
402
150
388
327
346
416
352
377
400
454
185
440
371
392
472
399
426
446
507
240
514
434
457
552
466
496
497
565
Notes:For single core cables, the sheaths of the circuit are assumed to be connected together at both ends. For bare cables exposed to touch, the tabulated values should be multiplied by 0.9.
TABLE 4G2A Mineral insulated cables bare and neither exposed to touch nor in contact with combustible materials (copper conductors & sheath)
Current Carrying Capacity (amperes)
30°C Ambient Air Temperature, 105°C Conductor Operating Temperature,
Conductor cross-sectional area
Reference Method C (Clipped Direct)
Reference Method E, F & G
Single phase AC or DC
Three phase AC
Single phase AC or DC
Three phase AC
2 single core cables touching or 1 2-core cable
3 single core cables in trefoil, or 1 3-core or 4-core cable
3 single core cables flat and touching, horizontal or vertical
2 single core cables touching or 12-core cable
3 single core cables in trefoil, or 1 3-core or 4-core cable
3 single core cables flat and touching
3 single core cables flat & spaced by one cable diameter
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
DISCLAIMER: The information on this page and the PDF is for information only and R&M Electrical Group Ltd can not be held liable for any information therein.
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