Introduction to SWA Cable
Table of contents
SWA cable — short for steel wire armoured cable — is the trade’s go-to power cable for outdoor, underground, and industrial applications. Its strength and reliability make it compliant with the mechanical protection requirements set out in BS 7671 (IET Wiring Regulations).
At Electrical4Less, we stock armoured cables manufactured by Doncaster Cables and UK Cables, ensuring every reel conforms to British Standards including BS 5467 (PVC) and BS 6724 (LSZH).
Why Electricians Say SWA
The abbreviation “SWA” has been used for decades to simplify “steel wire armoured.” It is recognised in trade practice, technical drawings, and even within BS 7671 Appendix 4, which covers current-carrying capacities and correction factors for different installation methods.
Browse our steel wire armoured cables.
How SWA Differs from Other Cables
SWA specifically uses galvanised steel wire for its armour, unlike other types that may use aluminium or braided materials. This gives it:
- Greater tensile strength for underground and industrial runs
- Improved resistance to impact and crushing loads
- The option to use the armour as a circuit protective conductor (CPC), provided it meets the requirements in BS 7671 Section 543
For installations subject to burial, electricians follow BS 7671 Regulation 522.8.10, which recommends adequate depth and mechanical protection. See our underground cables.
Typical Uses of SWA Cable
SWA cable is versatile and used in:
- Garden power and lighting
- Garage and shed supplies
- Sub-mains to outbuildings
- Three-phase circuits for workshops and industrial units
Available core ranges include:
- 2 Core LSZH SWA
- 3 Core PVC SWA | 3 Core LSZH SWA
- 4 Core PVC SWA | 4 Core LSZH SWA
- 5 Core PVC SWA | 5 Core LSZH SWA
- 7 Core LSZH SWA
Accessories for SWA Installations
SWA must be terminated and fixed correctly. Essential accessories include:
- Armoured Cable Glands – ensure strain relief and mechanical protection, as per BS 7671 Section 526
- SWA Gland Banjos – provide a reliable earth bond
- SWA Clips – secure cables to walls, joists, or posts
These accessories are not optional: BS 7671 Regulation 134.1.1 requires that every part of an installation is carried out with proper materials.
Choosing Between PVC and LSZH SWA
- PVC SWA – durable and cost-effective, suitable for most outdoor and underground runs, tested to BS 5467.
- LSZH SWA – low smoke, zero halogen; specified in BS 7671 Section 422 for buildings requiring enhanced fire protection, tested to BS 6724.
- Alternatives include Low Smoke SWA and LSF SWA.
FAQs – What Is SWA Cable
Is SWA cable waterproof?
Yes, when terminated with glands and installed in line with BS 7671 Section 522 (environmental conditions).
Can the armour be used as an earth?
Yes, if it meets the CPC size requirements in BS 7671 Table 54.7.
How deep should SWA be buried?
Domestic installs usually follow BS 7671 Regulation 522.8.10, recommending 450–600 mm burial depth with mechanical protection.
Do I need to use conduit with SWA?
Not normally — the steel wire armour is sufficient mechanical protection, provided installation complies with Regulation 522.6.204.
What glands do I need for SWA?
Use armoured cable glands that match the cable size. For earthing, add SWA gland banjos.
Who makes reliable SWA in the UK?
Electrical4Less supplies Doncaster Cables and UK Cables — both respected British manufacturers.
Can I run SWA inside a house?
Yes, BS 7671 allows it indoors, though it’s mainly specified for outdoor or underground runs.
Why Buy SWA Cable from Electrical4Less
At Electrical4Less we offer:
- SWA from Doncaster Cables and UK Cables
- Options in PVC SWA, LSZH SWA, Low Smoke SWA and LSF SWA
- Core sizes from 2C to 7C, all tested to relevant British Standards
- Accessories: Armoured Cable Glands, SWA Gland Banjos, SWA Clips
We supply trade customers nationwide with fast delivery and technical confidence.
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What Is SWA Cable? A Tradesperson’s Perspective