NYM-J LSF Cable
NYM-J LSF cable is a round, multicore installation cable with solid copper conductors, a green/yellow earth core and a low smoke and fume sheath, widely used for fixed wiring in Irish domestic and commercial installations. We stock NYMJ LSF white cable in 3 core, 4 core and 5 core, in sizes from 1.5mm to 6.0mm.
Every size comes on a 100m coil, including a 4 core 1.5mm SP version. Get trade pricing on a trade account, with next working day delivery across Northern Ireland and the Republic of Ireland on in-stock orders placed before 5pm.
How to choose the right NYM-J LSF cable
NYM-J is a familiar sight on Irish sites, where round multicore cable is commonly used in place of flat twin and earth. The LSF version replaces the older PVC-sheathed NYM-J with a low smoke and fume sheath, reflecting current Irish wiring rules (I.S. 10101).
Choosing the number of cores
- 3 core – line, neutral and earth for standard lighting, socket and appliance circuits.
- 4 core – an extra line core for two-way switching, switched and permanent feeds, or heating controls.
- 5 core – three-phase plus neutral and earth, or control circuits needing several switched lines.
Choosing the size
1.5mm is typical for lighting, 2.5mm for sockets and general power, and 4.0mm or 6.0mm for heavier loads such as cookers, showers and submains. These are typical uses only; size every circuit for design current, installation method, grouping and voltage drop as required by the applicable wiring rules and the manufacturer's data.
Installation tips
NYM-J LSF is designed for fixed installation indoors, including in dry and damp locations, on surfaces, in conduit or buried in plaster. It is not intended for direct burial or for permanent exposure to sunlight; for outdoor or underground runs, choose NYY-J cable with appropriate protection or SWA armoured cable. Because the cable is round, compression glands give a tidy, sealed entry into enclosures and IP-rated boxes. Strip the sheath carefully to avoid nicking the core insulation.
Meteor Electrical has been supplying electricians across Ireland for more than 40 years, with depots in Cashel and Saggart alongside our Cookstown head office. Free delivery applies over €35 / £30 ex VAT, and our team is available on 048 8675 1515 from ROI.
FAQ's
- Where is NYMJ LSF cable used?
- Can NYMJ LSF cable be used outside?
- What is NYMJ LSF cable?
- What does NYM-J stand for?
- Should I use 3, 4 or 5 core NYM-J?
- Is NYM-J LSF the same as twin and earth?