TPS Cable NZ: Everything Electricians Need to Know
TPS cable is one of the most widely used electrical cables throughout New Zealand. Whether you're wiring a new home, upgrading a switchboard, or completing a commercial fit-out, choosing the correct TPS cable helps ensure a safe, compliant and reliable installation.
Available in a variety of conductor sizes and configurations, TPS cable is suitable for fixed wiring applications across residential, commercial and light industrial projects. From 1.5 mm TPS used in lighting circuits through to 2.5 mm TPS cable NZ for socket outlets and larger 6 mm TPS installations, understanding the differences makes selecting the right cable much easier.
This guide explains the most common TPS cable sizes, the differences between flat TPS cable and circular TPS, when each is typically used, and what New Zealand electricians should consider before purchasing.
What Is TPS Cable?
TPS stands for Thermoplastic Sheathed cable.
It consists of insulated copper conductors enclosed within a durable PVC outer sheath and is designed for permanent fixed wiring installations. Most products used in New Zealand are manufactured to AS/NZS 5000.2, making them suitable for residential, commercial and light industrial electrical installations.
Common configurations include:
- Single core
- Twin
- Twin and Earth (2C+E)
- Three core and Earth
- Four core and Earth
The cable is designed for permanent installation rather than flexible applications.
Why TPS Cable Is Popular in New Zealand
TPS has remained the preferred building cable for decades because it offers:
- Excellent durability
- Easy installation
- Reliable electrical performance
- Suitable for concealed wall cavities
- Suitable for conduit installations
- Compatible with residential and commercial wiring systems
Electricians also appreciate its ease of termination and widespread availability across New Zealand wholesalers.
Flat TPS Cable
Flat TPS cable is the most common style found in New Zealand homes.
It is commonly used for:
- Lighting circuits
- Socket outlet circuits
- Kitchen wiring
- Heat pumps
- Water heaters
- General domestic wiring
The flat design makes it easy to clip neatly inside timber framing and roof spaces while simplifying cable runs through wall cavities. It is the standard choice for most residential fixed wiring applications.
Circular TPS Cable
Unlike flat TPS, circular TPS features conductors arranged inside a round sheath.
It is often preferred where:
- Multiple cables are installed in conduit
- Mechanical protection is required
- Commercial installations
- Industrial buildings
- Switchboard wiring
- Surface-mounted cable runs
Because of its shape, circular TPS generally pulls through conduit more easily than flat cable.
1.5 mm TPS
One of the most searched cable sizes is 1.5 mm TPS.
This cable is typically selected for:
- Residential lighting circuits
- Smoke alarms
- Low current fixed wiring
- Control circuits
Exact circuit design should always follow AS/NZS Wiring Rules and manufacturer recommendations.
2.5 mm TPS Cable NZ
The most commonly purchased building cable is 2.5 mm TPS cable NZ.
Typical applications include:
- General power outlet circuits
- Kitchen power circuits
- Laundry circuits
- Fixed appliances
- Garage circuits
Many New Zealand homes use 2.5 mm twin and earth cable as the standard cable size for general socket outlet installations. Guidance for common residential circuits reflects this widespread practice.
2.5 mm TPS Cable Price
A frequent online search is 2.5 mm TPS cable price.
Pricing depends on several factors including:
- Cable length
- Copper market prices
- Brand
- Manufacturing origin
- Flat or circular construction
- Number of conductors
Buying from an online electrical wholesaler often provides competitive pricing compared with purchasing individual rolls from retail hardware stores.
For contractors purchasing multiple drums, wholesale pricing can deliver significant savings across larger projects.
Understanding 6mm TPS Current Rating
Searches for 6mm TPS current rating are very common.
However, there is no single current rating that applies to every installation.
Current-carrying capacity depends on factors such as:
- Installation method
- Ambient temperature
- Grouping of cables
- Thermal insulation
- Cable construction
- Voltage drop requirements
Because of these variables, electricians should always refer to AS/NZS 3008, the current Wiring Rules, and the manufacturer's published data rather than relying on generic figures.
Flat TPS vs Circular TPS
Flat TPS
Circular TPS
Residential wiring
Commercial wiring
Easy to clip to framing
Easier conduit installation
Lower profile
Better mechanical protection in conduit
Most common in homes
Often preferred for industrial work
Both cable types have their place depending on the installation.
Choosing the Correct TPS Cable
Before selecting any TPS cable, consider:
Installation environment
Will the cable be:
- Inside walls?
- In conduit?
- Underground (with suitable protection)?
- Surface mounted?
Circuit load
Choose conductor size based on:
- Design current
- Voltage drop
- Installation conditions
- Protection device
Future expansion
Installing slightly larger cable where appropriate may reduce future upgrade costs if additional load is anticipated.
Is TPS Suitable Outdoors?
Standard PVC TPS is primarily intended for fixed wiring and should not be exposed to prolonged ultraviolet light unless specifically designed for that purpose or otherwise protected. Where cables are installed externally, appropriate protection or a cable specifically rated for the environment should be used.
Buying TPS Cable Online
Purchasing online offers several advantages:
- Competitive trade pricing
- Bulk purchase discounts
- Fast nationwide delivery
- Easy comparison of cable sizes
- Convenient ordering for multiple projects
Professional electricians increasingly purchase online to reduce time spent visiting physical wholesalers.
Is Bunnings TPS Cable the Best Option?
Many people search for Bunnings TPS cable simply because it's a familiar retailer.
However, professional electricians generally compare suppliers on factors such as:
- Product range
- Trade pricing
- Availability
- Delivery speed
- Technical support
- Brand selection
Dedicated electrical wholesalers often carry a broader range of cable sizes and configurations than general hardware retailers.
Tips for Storing TPS Cable
To maintain cable quality:
- Store indoors where possible.
- Protect from moisture.
- Avoid prolonged direct sunlight.
- Prevent crushing or sharp bends.
- Keep drums upright during storage.
Good storage practices help protect the cable sheath and make installation easier.
Frequently Asked Questions
What is TPS cable?
TPS stands for Thermoplastic Sheathed cable. It is commonly used for fixed electrical wiring throughout New Zealand.
What is 2.5 mm TPS cable used for?
It is widely used for general power outlet circuits, permanently connected appliances and other fixed wiring applications, subject to correct circuit design.
What is 1.5 mm TPS used for?
1.5 mm TPS is commonly used for residential lighting circuits and other lower-current fixed wiring applications.
What is the difference between flat TPS cable and circular TPS?
Flat TPS is generally preferred for residential building wiring, while circular TPS is commonly selected for conduit installations and many commercial or industrial applications.
What is the current rating of 6mm TPS?
There is no universal current rating. It depends on installation conditions, cable construction and applicable standards. Always refer to AS/NZS 3008 and the manufacturer's technical data.
Is TPS cable suitable for outdoor use?
Standard TPS should be protected from prolonged UV exposure unless the specific cable is designed for external use or installed with suitable protection.
Conclusion
TPS cable remains the backbone of fixed electrical wiring across New Zealand. Whether you're installing 1.5 mm TPS for lighting, selecting 2.5 mm TPS cable NZ for power circuits, or specifying circular TPS for commercial projects, choosing the correct cable size and installation method is essential for a safe, compliant outcome.
When comparing 2.5 mm TPS cable price, don't focus solely on cost. Consider product quality, compliance, availability, and supplier support to ensure long-term value for every installation.
Browse our TPS Cable to find the right cable for your next project, or Contact Us if you'd like advice on selecting the best TPS cable for your application. Our team is here to help New Zealand electricians source reliable products at competitive trade prices.