| P A Hanratty | 028 9042 8681 | | 1 Downshire Place, Holywood, BT18 9LR |  Map & Directions |
| Electrical Technical Services | 028 9042 5971 | | 21 Ardmore Heights, Holywood, BT18 0PY | | Map & Directions |
| Premier Electrical Ltd | 028 9756 4046 | | 87 Dromore Road, Ballynahinch, BT24 8HT | | Map & Directions |
| K S Electrics | 028 7137 1128 | | Springtown Road, Londonderry, BT48 0LY | | Map & Directions |
| J A Adair | 028 9048 4856 | | 366 Comber Road, Dundonald, Belfast, BT16 1XB | | Map & Directions |
| W R Mcmullan | 028 3755 1536 | | 1 Cladymilltown Road, Markethill, Armagh, BT60 1RS | | Map & Directions |
| P Dougan | 028 2587 1224 | | 11 Church Street, Ahoghill, Ballymena, BT42 2PA | | Map & Directions |
| K & S Electrics | 028 7128 6777 | | 1 Laburnum Terrace, Londonderry, BT48 9EN | | Map & Directions |
| M & E Sheridan Ltd | 028 9065 2040 | | 6-8 Greenwood Avenue, Belfast, BT4 3JJ | | Map & Directions |
| M & M Electrics | 028 7772 9451 | | 30 Ballynarrig Road , Limavady, BT49 9LP | | Map & Directions |
| Mgm Electrical | 028 7965 0872 | | 88 Shore Road, Toomebridge, Antrim, BT41 3NR | | Map & Directions |
| R D S Contracts Ltd | 028 9261 9898 | | 3 Maryvale Road , Moira, Craigavon, BT67 0PN | | Map & Directions |
| Northern Electrical Contracts Ltd | 028 9046 9000 | | Fuel House, 25-29 Sydenham Road, Belfast, BT3 9DH | | Map & Directions |
| Horton Electrical Services Ltd | 028 7130 8858 | | 1 Bay Road, Londonderry, BT48 7SH | | Map & Directions |
| I J Dowling | 028 9048 7070 | | Hillhead Road, Dundonald, Belfast, BT16 1XD | | Map & Directions |
| D M Electrics | 028 4372 6067 | | 1 Riverside Park, Newcastle, BT33 0LJ | | Map & Directions |
| Craigavon Electrical Services | 028 3835 0101 | | Craigavon Enterprise Centre, Carn Drive, Portadown, Craigavon, BT63 5RH | | Map & Directions |
| Collins Electric Co | 028 9064 2396 | | 2a Deramore Avenue, Belfast, BT7 3ER | | Map & Directions |
| E Mansell & Co | 028 4483 1533 | | 113 Thornyhill Road, Crossgar, Downpatrick, BT30 9NH | | Map & Directions |
| Glenview Electrical Contractors | 028 9062 7677 | | Unit 6 Work West Enterprise Centre, 301 Glen Road, Andersonstown, Belfast, BT11 8BU | | Map & Directions |
| Mcdevitt | 028 9047 2626 | | 212-218 Upper Newtownards Road , Belfast, BT4 3ET | | Map & Directions |
| Angus Electrical | 028 9027 0211 | | 9 Alfred Street, Bangor, BT20 5DH | | Map & Directions |
| Stothers Ltd | 028 9045 0821 | | Radiant Works, 23 Sunwich Street, Belfast, BT6 8HR | | Map & Directions |
| R A Breadon | 028 9182 2081 | | 13 Drumawhey Road, Newtownards, BT23 8RS | | Map & Directions |
| Delta Electrical Contracts | 028 9074 6126 | | Brookfield Business Centre, 333 Crumlin Road, Belfast, BT14 7EA | | Map & Directions |
| Schrader Electronics Ltd | 028 9446 1300 | | 11 Belfast Road, Technology Park, Muckamore, Antrim, BT41 1QS | | Map & Directions |
| A J M Electrical | 028 2955 8991 | | 7 Lisachrin Road, Garvagh, Coleraine, BT51 5PE | | Map & Directions |
| Sean Madine | 028 4485 1617 | | 43 Tobercorran Road, Downpatrick, BT30 8HU | | Map & Directions |
| Mcdowell Installations | 028 9046 1912 | | Unit 1, Tamar Commercial Centre, Tamar Street , Belfast, BT4 1HS | | Map & Directions |
| H J Gribben | 028 7946 8639 | | 121 Creagh Road , Castledawson, Magherafelt, BT45 8EY | | Map & Directions |
| Power Action Ltd | 028 9260 4442 | | Unit 209, Ballinderry Road, Lisburn, BT28 2SA | | Map & Directions |
| Euro Testing Services | 028 3752 8124 | | 1 Thornliegh, Armagh, BT60 1HT | | Map & Directions |
| Britannia | 028 9083 8030 | | 51 Mallusk Road , Newtownabbey, BT36 4PU | | Map & Directions |
| H Griffin | 028 7965 0437 | | 48 Loughbeg Road, Toomebridge, Antrim, BT41 3TN | | Map & Directions |
| D M G Electrics Ltd | 028 9187 8808 | | 66 Castle Street, Comber, Newtownards, BT23 5DZ | | Map & Directions |
| Star Delta Electrical Co | 028 9045 7535 | | 8-10 Tamar Street, Belfast, BT4 1HS | | Map & Directions |
| Alan Little Ltd | 028 3832 2322 | | 30-32 Queens Place, Lurgan, Craigavon, BT66 8BY | | Map & Directions |
| R H K Davidson | 028 7034 2281 | | 35 Bushmills Road, Coleraine, BT52 2BP | | Map & Directions |
| Ashdale Engineering | 01624 664532 | | 39a York Park, Belfast, BT15 3PX | | Map & Directions |
| Bryan Powercom | 028 9032 6315 | | 19 University Street, Belfast, BT7 1FY | | Map & Directions |
| Mt Electrical | 028 3834 7876 | | 17 Tullydagan Road, Lurgan, Craigavon, BT67 9LJ | | Map & Directions |
| Mcgurk & Moore | 028 7126 2960 | | Unit 15 Springtown Industrial Estate, Springtown Road, Londonderry, BT48 0LY | | Map & Directions |
| Modern Lighting Co | 028 3026 9750 | | 9a Lower Catherine Street, Newry, BT35 6JG | | Map & Directions |
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