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Technical Training

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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.

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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.

Motor Current Charts

Motor: Motor Current Charts

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Selection Tables – Three Phase Motors

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.

Single Phase Motors

MOTOR RATINGHPAPPROX. F.L.C. AT LINE VOLTAGE
110V AC220V AC240V AC
0.07 kW1/122.41.21.1
0.1 kW1/83.31.61.5
0.12 kW1/63.81.91.7
0.18 kW1/44.52.32.1
0.25 kW1/35.82.92.6
0.37 kW1/27.93.93.6
0.56 kW3/4115.55
0.75 kW1157.36.7
1.1 kW1.521109
1.5 kW2261312
2.2 kW3371917
3 kW4492422
3.7 kW5542725
4 kW5.5603027
5.5 kW7.5854138
7.5 kW101105550

Three Phase Motors

MOTOR RATINGHPAPPROX. F.L.C. AT LINE VOLTAGE
220V AC240V AC380V AC415V AC550V AC
0.1 kW1/80.70.60.40.40.3
0.12 kW1/610.90.50.50.3
0.18 kW1/41.31.20.80.70.4
0.25 kW1/31.61.50.90.90.6
0.37 kW1/22.52.31.41.30.8
0.56 kW3/43.12.81.81.61.1
0.75 kW13.53.221.81.4
1.1 kW1.554.52.82.61.9
1.5 kW26.45.83.73.42.6
2.2 kW39.58.75.553.5
3.0 kW4121176.54.7
3.7 kW51513886
4.0 kW5.51614986
5.5 kW7.5201912118
7.5 kW102725161511
9.3 kW12.53432201814
10 kW13.53734222015
11 kW154137232216
15 kW206450312821
18 kW256762393626
22 kW307470433930
30 kW409991575241
37 kW50130119756950
45 kW60147136867959
55 kW751831661059672
75 kW10023921913812595
90 kW125301269170156117
110 kW150350325205189142
130 kW175410389245224169
150 kW200505440278255192

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Cable: SWA Cables

Cable: SWA Cables

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Table 4E4A – Current Carrying Capacity in Ampere

  • Current Rating Chart for Multicore Armoured
  • Thermoplastic Insulated Cables with Copper
  • Conductors at 90°C Operating Temperature Extract from the IEE Wiring Regulations, 17th Edition
  • 30°C Ambient Air Temperature,
  • 90°C Conductor Operating Temperature,
  • 20°C Ambient Ground Temperature
Conductor cross-sectional area mm²REFERENCE METHOD C - CLIPPED DIRECTMethod D - Direct or in ducts, in ground, in/around buildings.Method E - In free air or on a perforated cable tray.
1 two-core* cable, single1 three-core* or 1 four-core1 two-core* cable, single1 three-core* or 1 four-core1 two-core* cable, single1 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.
1.5272325212925
2.5363133283933
4494243365244
6625353446656
10857371589078
1611094917511599
2514612411696152131
35180154139115188162
50219187164135228197
70279238203167291251
95338289239197354304
120392335271223410353
150451386306251472406
185515441343281539463
240607520395324636546
300698599446365732628
400787673847728

Table 4E4B – Voltage drop per ampere, per metre 70°C conductor operating temperature

Conductor crosssectional area mm²Two-core cable, D.C.Two-core cable, single phase A.C.Three or four-core cable, three-phase A.C.
mV/A/mmV/A/mmV/A/m
1.5313127
2.5191916
4121210
67.97.96.8
104.74.74.0
162.92.92.5
rxzrxz
251.8501.8500.1601.9001.6000.1401.650
351.3501.3650.1551.3651.1500.1351.150
500.9800.9900.1551.0000.8600.1350.870
700.6700.6700.1500.6900.5900.1300.600
950.4900.5000.1500.5200.4730.1300.450
1200.3900.4000.1450.4200.3400.1300.380
1500.3100.3200.1450.3500.2800.1250.300
1850.2500.2600.1450.2900.2200.1250.260
2400.1950.2000.1400.2400.1750.1250.210
3000.1550.1600.1400.2100.1400.1200.185
4000.1200.1300.1400.1900.1150.1200.165

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Cable: PVC Singles

Technical Resources

We have gathered together a number of technical resources for use as reference on electrical projects.

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Cable: PVC Singles

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PVC Singles 6491X to bs6004

Table 4D1A – Single core

70ºC thermoplastic insulated cables, nonarmoured, with or without sheath (copper conductors)

Conductor cross-sectioal areaReference Method A (enclosed in conduit in thermally insulating wall etc.)Reference Method B (enclosed in conduit on a wall or in trunking etc)Reference Method C (clipped direct)Reference Method F (in free air or on a perforated cable tray, horizontal or vertical)
TouchingSpaced by one diameter
2 cables, single-phase A.C or D.C3 or 4 cables, three -phase A.C2 cables, single-phase A.C or D.C3 or 4 cables, three -phase AC2 cables, single-phase AC or D.C flat & touching3 or 4 cables, threephase A.C flat & touching or trefoil2 cables, single-phase AC or D.C flat3 cables, three -phase AC flat3 cables, three -phase AC trefoil2 Cables, single-phase A.C or D.C or 3 cables three-phase A.C. flat
mm2AAAAAAAAAAA
1.514.513.517.515.52018-----
2.5201824212725-----
4262432283733-----
6343141364743-----
10464257506559-----
16615676688779-----
25807310189114104131114110146130
359989125110141129162143137181162
50119108151134182167196174167219197
70151136192171234214251225216281254
95182164232207284261304275264341311
120210188269239330303352321308396362
150240216300262381349406372356456419
185273245341296436400463427409521480
240320286400346515472546507485615569
300367328458394594545629587561709659
400--546467694634754689656852795

Table 4D1B

  • Conductor operating temperature: 70°C
  • Voltage drop (millivolts per ampere per metre)
Conductor cross-sectional area 2 cables D.C. 2 cables - single phase A.C. Reference Methods A & Bn(Enclosed in conduitnor trunking) 2 cables - single phase A.C. Reference Methods C & Fn(clipped direct, on tray or in free air)
Cables Touching Cables Spaced*
mm2mV/A/mmV/A/mmV/A/mmV/A/m
144444444
1.529292929
2.518181818
411111111
67.37.37.37.3
104.44.44.44.4
162.82.82.82.8
rxzrxzrxz
251.751.80.331.81.750.21.751.750.291.8
351.251.30.311.31.250.1951.251.250.281.3
500.930.950.310.930.190.950.930.280.97
700.630.650.290.720.630.1850.660.630.270.69
950.460.490.280.560.470.180.50.470.270.54
1200.360.390.270.470.370.1750.410.370.260.45
1500.290.310.270.410.30.1750.340.290.260.39
1850.230.250.270.370.240.170.290.240.260.35
2400.180.1950.260.330.1850.1650.250.1850.250.31
3000.1450.160.260.310.150.1650.220.150.250.29
4000.1050.130.260.290.120.160.20.1150.250.27
5000.0860.110.260.280.0980.1550.1850.0930.240.26

SPACINGS LARGER THAN ONE CABLE DIAMETER WILL RESULT IN A LARGER VOLTAGE DROP

Table 41DB (Continued)

Conductor cross-sectional area 3 or 4 cables - Three phase A.C. Reference Methods A & Bn(Enclosed in conduit or trunking) 3 or 4 cables - Three phase A.C. Reference Method C & Fn(clipped direct, on tray or in free air)
Cables touching, trefoil Cables touching, flat Cables spaced*, flat
mm2mV/A/mmV/A/mmV/A/mmV/A/m
138383838
1.525252525
2.515151515
49.59.59.59.5
66.46.46.46.4
103.83.83.83.8
162.42.42.42.4
Rxzrxzrxzrxz
251.50.291.551.50.1751.51.50.251.551.50.321.55
351.10.271.11.10.171.10.241.11.11.10.321.15
500.810.260.850.80.1650.820.80.240.840.80.320.86
700.560.250.610.550.160.570.550.240.60.550.310.63
950.420.240.480.410.1550.430.410.230.470.40.310.51
1200.330.230.410.320.150.360.320.230.40.320.30.44
1500.270.230.360.260.150.30.260.230.340.260.30.4
1850.220.230.320.210.1450.260.210.220.310.210.30.36
2400.170.230.290.160.1450.220.160.220.270.160.290.34
3000.140.230.270.130.140.190.130.220.250.130.290.32
4000.120.220.250.1050.140.1750.1050.210.240.10.290.31
5000.10.220.250.0860.1350.160.0860.210.230.0810.290.3

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Cable: PVC Flexes

Technical Resources

We have gathered together a number of technical resources for use as reference on electrical projects.

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Cable: PVC Flexes

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PVC Flexes: BS 6141 & BS 6500

Table 4F3A -­ flexible cords, non-­armoured (copper conductors)

Current Carrying Capacity

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.
mm2AAkg
0.5332
0.75663
110105
1.2513-5
1.516165
2.525205
432255

RATING FACTOR FOR AMBIENT TEMPERATURE

60ºC thermoplastic or thermosetting insulated cords:

Ambient temperature35ºC40ºC45ºC50ºC55ºC
Rating Factor0.910.820.710.580.41

90ºC thermoplastic or thermosetting insulated cords:

Ambient temperature35ºC to 50ºC55ºC60ºC65ºC70ºC
Rating Factor10.960.830.670.47

Glass fibre cords:

Ambient temperature35ºC to 150ºC155ºC160ºC165ºC170ºC175ºC
Rating Factor10.920.820.710.570.4

180ºC thermoplastic or thermosetting insulated cords:

Ambient temperature35ºC to 120ºC125ºC130ºC135ºC140ºC145ºC
Rating Factor10.960.850.740.60.42

VOLTAGE DROP

Table 4F3B Conductor operating temperature: 60ºC

Conductor cross-sectional area D.C. or single-phase A.C Three-phase A.C.
mm2AmV/A/m
0.59380
0.756254
14640
1.2537-
1.53227
2.51916
41210

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 insulated1.09
180ºC thermosetting insulated1.31
185ºC glass fibre1.43

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Cable: Multi-Core PVC Insulated Cables

Technical Resources

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PVC Insulated Cables

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MULTI-CORE PVC Insulated Cables (NON Armoured, copper conductors)

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 mmu00b2Method A - Enclosed in conduit in an insulated wall.Method B - Enclosed in conduit on a wall or in trunking.REFERENCE METHOD C - CLIPPED DIRECTMethod E - In free air or on a perforated cable tray.
1 two-core* cable, single1 three-core* or 1 four-core1 two-core* cable, single1 three-core* or 1 four-core1 two-core* cable, single1 three-core* or 1 four-core1 two-core* cable, single1 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.
111101311.51513.51714.5
1.5141316.51519.517.52218.5
2.518.517.5232027243025
42523302736324034
63229383446415143
104339524663577060
165752696285769480
257568908011296119101
35928311199138119148126
5011099133118168144180153
70139125168149213184232196
95167150201179258223282238
120192172232206299259328276
150219196258225344299379319
185248223294255392341434364
240291261344297461403514430
300334298394339530464593497
400--470402634557715597

Table 4D2B – Voltage drop per ampere, per metre 70°C conductor operating temperature

Conductor cross sectional area2-core cable, DC2-core cable, single phase AC3 or 4-core cable, three-phase AC
mV/A/mmV/A/mmV/A/m
1444438
1.5292925
2.5181815
411119.5
67.37.36.4
104.44.43.8
162.82.82.4
rxzrxz
251.751.750.171.751.50.1451.5
351.251.250.1651.251.10.1451.1
500.930.930.1650.940.80.140.81
700.630.630.160.650.550.140.57
950.460.470.1550.50.410.1350.43
1200.360.380.1550.410.330.1350.35
1500.290.30.1550.340.260.130.29
1850.230.250.150.290.210.130.25
2400.180.190.150.240.1650.130.21
3000.1450.1550.1450.210.1350.130.185
4000.1050.1150.1450.1850.10.1250.16

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Cable: MICC Cables

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Cable: MICC Cables

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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 areaReference Method C (Clipped Direct)Reference Method E, F or G
single phase AC or DCthree phase ACsingle phase AC or DCthree phase AC
2 single cord cables touching or 1 2-core cable3 single core cables in trefoil or 1 3-core or 4-core cable3 single core cables flat and touching, horizontal or vertical2 single cord cables touching or 1 2-core cable3 single core cables in trefoil, or 1 3-core or 4-core cable3 single core cables flat and touching, horizontal or vertical3 single core cables flat & spaced by one cable diameter
verticalhorizontal
LIGHT DUTY 500V
118.5151719.516.5182023
1.52319212521232629
2.53126293328313439
44035384437414551
HEAVY DUTY 750V
119.516182117.5202225
1.52521232622262832
2.53428313630343743
44537414740454956
65748526051576271
107765708269778495
16102869210992102110125
25133112120142120132142162
35163137147174147161173197
50202169181215182198213242
70247207221264223241259294
95296249264317267289309351
120340286303364308331353402
150388327346416352377400454
185440371392472399426446507
240514434457552466496497565

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 areaReference Method C (Clipped Direct)Reference Method E, F & G
Single phase AC or DCThree phase ACSingle phase AC or DCThree phase AC
2 single core cables touching or 1 2-core cable3 single core cables in trefoil, or 1 3-core or 4-core cable3 single core cables flat and touching, horizontal or vertical2 single core cables touching or 12-core cable3 single core cables in trefoil, or 1 3-core or 4-core cable3 single core cables flat and touching3 single core cables flat & spaced by one cable diameter
verticalhorizontal
LIGHT DUTY 500V
12219212421232629
1.52824273126293337
2.53833364135394349
45144475446515664
HEAVY DUTY 750V
12420242622252832
1.53126303328323540
2.54235414538434754
45547536050566170
67059677664717889
109681911048796105120
16127107119137115127137157
25166140154179150164178204
35203171187220184200216248
50251212230272228247266304
70307260280333279300323370
95369312334400335359385441
120424359383460385411441505
150485410435526441469498565
185550465492596500530557629
240643544572697584617624704

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Cable: Cat6 Cable Specification

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Cable: Cat6 Cable Specification

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Specification for Hyper-Data 2000
CAT6 UTP Stranded LSZH Lan Cable

Spec. No. S901106 Version: B Date: March 25th, 2008

TIA/EIA-568-B.2-1: Patch Cable (Stranded Conductor), 24 AWG x 4P

1. Conductor:Stranded Bare Copper (7 x 32 AWG)
2. Insulation:HDPE (CMI-75E)Nominal Wall Thickness: 0.178mm
Min. Thickness: 0.153mm
3. Color Code:Pair 1: Blue & White/Blue
Pair 2: Orange & White/Orange
Pair 3: Green & White/Green
Pair 4: Brown & White/Brown
4. Jacket (Grey):75°C LSZH Compound Nominal Wall Thickness: 0.585mm
Min. Thickness: 0.458mm
Overall Diameter: 5.8mm ± 0.3mm
5. Electric Requirements:(Cable length: 100m) Characteristic Impedance (Zo): 85~115Ω (1~250 MHz)
DC. Resistance Capacitance Unbalance: 5%
Pair-to-Ground Capacitance Unbalance: 330 pF/100m Max.
Conductor Resistance: 14.00Ω/100m 20o Max.
Mutual Capacitance: 5.6nF/m Max.
Spark Test: 2.5kV
Nominal Velocity of Propagation (NVP): 69%

RoHS Compliant

Frequency MHzAtt. StrandedPr-Pr NEXTPS NEXTProp. Delay nsDelay Skew nsReturn LossPr-Pr ELFEXTPS ELFEXT
12.474.372.3538.5452067.864.8
107.159.357.3545452547.844.8
2010.254.852.8539.9452541.838.8
31.2512.851.949.9540.24523.337.934.9
62.518.547.445.4540.84520.731.928.9
10023.844.342.3541.4451927.824.8
20034.839.837.8542.54516.421.818.8
25039.438.336.35434515.619.816.8

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Cable Gland & Cable Cleat Selector Chart

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Cable Gland & Cable Cleat Selector Chart

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WARNING: Whilst all due care has been taken in compiling this chart, it is for guidance only. Cable sizes must be checked prior to gland selection

GLAND TYPE
CONDUCTOR SIZE (MM SQUARED)NO. OF CORESINDOOROUTDOORCLEAT SIZE
BW GLANDCW GLAND
1.5220S20/165
320S20/166
420S20S6
720S20S7
1220208
19252510
27323211
37323212
48323214
2.5220S20S6
320S20S6
420S20S6
720207
1225259
19252511
27323212
37323214
48404016
4220S20S6
320S20S6
420207
720208
12252510
19323212
27404014
6220S20S7
320207
420208
10220208
325258
425258
16225259
3252510
4252511
25225259
3323210
4323212
352323212
3323212
4323214
502323212
3323212
4323214

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