| T D Edwards Ltd | 01443 409680 | | 26 Mackintosh Road , Pontypridd, CF37 4AG |  Map & Directions |
| G & P Williams | 01656 730430 | | 28 Coronation Terrace , Nantyffyllon, Maesteg, CF34 0EP | | Map & Directions |
| Beechwood Electrical Ltd | 029 2077 0592 | | 4 Ruperra Close, Old St. Mellons, Cardiff, CF3 6HX | | Map & Directions |
| Lloyd Morris Electrical Ltd | 01656 667803 | | Unit 9 North Point, Western Avenue, Bridgend Industrial Estate, Bridgend, CF31 3RX | | Map & Directions |
| C J S Electrical | 029 2068 9339 | | Contract House , Lisvane Road, Lisvane, Cardiff, CF14 0SG | | Map & Directions |
| St Leger Electrical | 029 2046 0194 | | 1a Cameron Street, Cardiff, CF24 2NX | | Map & Directions |
| E T T Instrumentation Troubleshooters | 029 2049 2863 | | 14 Wordsworth Avenue, Cardiff, CF24 3FQ | | Map & Directions |
| Jj Maintenance Ltd | 01685 813580 | | 1 Bryngelli Estate, Hirwaun, Aberdare, CF44 9PT | | Map & Directions |
| I C P Flexon Ltd | 01443 477970 | | Office 8 Cwm Cynon Business Centre, Cwm Cynon Business Park, Mountain Ash, CF45 4ER | | Map & Directions |
| Lee Beesley Ltd | 01685 385524 | | Merthyr Tydfil Industrial Estate, Dowlais, Merthyr Tydfil, CF48 2SS | | Map & Directions |
| Crews Electrical Contracting | 029 2079 6161 | | 45 Ridgeway Road, Rumney, Cardiff, CF3 4AB | | Map & Directions |
| Cardiff Power & Lighting | 029 2047 1849 | | Manor House, Ipswich Road, Cardiff, CF23 9AQ | | Map & Directions |
| C G Bolton Electrical Ltd | 01633 680651 | | Woodvale, Mill Lane, Michaelston-Y-Fedw, Cardiff, CF3 6XT | | Map & Directions |
| Amber Electrical | 01443 841122 | | Unit 2 Taff Business Centre, Tonteg Road, Treforest Industrial Estate, Pontypridd, CF37 5UA | | Map & Directions |
| Sola Electrical | 029 2085 0282 | | Welland Buildings, Penyrheol, Caerphilly, CF83 2AP | | Map & Directions |
| Electrical & Instrument Equipment In Hazardous Areas Engineers | 01656 662843 | | The Old Garage, Laleston, Bridgend, CF32 0LY | | Map & Directions |
| Oasis Engineering Ltd | 01685 387541 | | Unit 4 & 8 Valleys Enterprise Centre, Pant Industrial Estate, Dowlais, Merthyr Tydfil, CF48 2SR | | Map & Directions |
| A T Farrant | 029 2046 0825 | | 13 Princes Avenue, Roath, Cardiff, CF24 3SN | | Map & Directions |
| Jeal Electrical Factors | 01656 735538 | | 80 Castle Street, Maesteg, CF34 9YL | | Map & Directions |
| All Electrical Services | 029 2081 0274 | | Northmace House, Viaduct Road, Gwaelod-Y-Garth, Cardiff, CF15 9XF | | Map & Directions |
| Mitie Engineering Services Cardiff Ltd | 029 2036 1963 | | Mitie House Springmeadow Business Park, Springmeadow Road, Rumney, Cardiff, CF3 2ES | | Map & Directions |
| Lektronix Automation & Control Ltd | 01656 720205 | | Unit 8 Aneurin Bevan Avenue, Brynmenyn Industrial Estate, Brynmenyn, Bridgend, CF32 9SZ | | Map & Directions |
| Bull Technical Services | 01656 880187 | | 1 West Farm Road, Ogmore-By-Sea, Bridgend, CF32 0PU | | Map & Directions |
| Jeff Steinz Electrical Contractors Ltd | 01656 860808 | | 24 Heol Croesty, Pencoed, Bridgend, CF35 5LR | | Map & Directions |
| E J Honeybun Ltd | 01443 485042 | | Smith House, Cardiff Road, Rhydyfelin, Pontypridd, CF37 5HP | | Map & Directions |
| Gomer Electrical Ltd | 029 2022 8384 | | Alfred Cook Building, Canal Parade, Cardiff, CF10 5RD | | Map & Directions |
| Wings | 01443 224163 | | 48 Duffryn Crescent, Bryncae, Llanharan, Pontyclun, CF72 9RS | | Map & Directions |
| Service Control Ltd | 01656 647172 | | York Road, Bridgend Industrial Estate, Bridgend, CF31 3TB | | Map & Directions |
| Tugbury Electrcial Services Ltd | 029 2061 9919 | | 372 North Road, Cardiff, CF14 3BP | | Map & Directions |
| Electroserve Installations | 01443 437999 | | Unit 7 Llwynypia Road, Tonypandy Enterprise Park, Tonypandy, CF40 2ET | | Map & Directions |
| P I Underwood & Son Ltd | 029 2062 3613 | | 18 Court Close, Cardiff, CF14 1JR | | Map & Directions |
| Cowbridge & Vale Electrical | 01446 772468 | | Po Box 14, St. Mary Church, Cowbridge, CF71 7WA | | Map & Directions |
| M F Perry | 01443 671035 | | 5 Tylcha Fach Terrace, Tonyrefail, Porth, CF39 8BB | | Map & Directions |
| Woodland Uk Ltd | 01656 767741 | | Eardisley, Cefn Glas Road, Bridgend, CF31 4QP | | Map & Directions |
| B-Warm Electrical & Heating Services | 029 2085 1687 | | 45 Cae Nant Gledyr, Caerphilly, CF83 2BB | | Map & Directions |
| Glamorgan Electrical Repairs | 029 2048 8445 | | 4 Portmanmoor Road Lane, Cardiff, CF24 5EQ | | Map & Directions |
| Balfour Beatty Power Network Ltd | 029 2036 1139 | | Wentloog House, Wentloog Road, Wentloog Corporate Park, Rumney, Cardiff, CF3 2ER | | Map & Directions |
| Deritend Group | 01443 842777 | | Unit C5 3, Treforest Industrial Estate, Pontypridd, CF37 5UD | | Map & Directions |
| F G Barber | 029 2061 1759 | | 110 St. Anthony Road, Cardiff, CF14 4DJ | | Map & Directions |
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