Today’s needs for internet connection have expanded from indoor gaming and streaming movies to outdoor security surveillance systems and outdoor entertainment centers. Many residential and businesses see the need to extend their network to the outside and between buildings. Outdoors and direct burial cables may be the best options because wireless security issues and maintain a reliable connection may be limited due to range and weather conditions. Direct burial cables are best used in wet locations, whether it be above or below ground without the use of conduit.

Temperature Rating
It is important to consider the temperature rating when using outdoor rated cables because these types of cables are designed to withstand heat and cold and require harsher protection than normal indoor cables. Standard PVC cables can only withstand a temperature down to -20°, whereas outdoor rated cables use a PE (Polyethylene) jacket that can withstand temperatures down to -40°C.
A cable with an outdoor-rated PE (Polyethylene) jacket is recommended for cables that are going to be used in colder climates. PE jackets are made from a semi-crystalline thermoplastic material which makes them ideal for withstanding lower temperatures. A common PVC jacket can support temperatures down to -20℃ (-4 F), however, a Polyethylene jacket can support temperatures as low as -40℃ (-40 F).

Outdoor-rated Cable
Outdoor-rated cables are normally made of PE or UV-resistant PVC material to withstand heat and UV rays. Outdoor-rated cables are constructed with UV protection to maintain cable integrity and prevent degradation down the line. In comparison, most Indoor cable brands are commonly constructed with standard PVC (Polyvinyl chloride) jackets that offer no UV (ultraviolet) protection and constant exposure to direct sunlight will result in a brittle jacket that can crack and compromise its connection. Outdoor-rated cables are designed to be used outdoor, but they are not recommended for direct burial unless a conduit is used.
All Syston’s riser-rated cables come standard with UV sunlight protection to prolong the life of your outdoor cables.


Direct Burial Cables                         
Direct burial cables can also have an outdoor-rated PVC jacket covering their internal wiring, but internally they are constructed much differently than an outdoor-rated cable. Direct burial cables are designed to be buried, just like their name suggests. Moisture is always a threat when cables are exposed to the elements and waterproofing the cables can help prevent moisture damage. Direct burial is designed to be buried underground without the use of conduit and you can tell them apart by the internal materials used to construct them.
Syston’s Ethernet and coaxial direct burial cables utilize gel-filled water-blocking compounds to deliver reliable connection, maximum speed, and signal quality.

Water Blocking Gel
A gel is injected into the cable where it fills all gaps and crevices throughout the cable construction while covering the internal wire insulations to repel water and prevent damages to the conductors.


Water Blocking Tape                               
A tape is wrapped in the internal wiring to give another layer of protection from moisture and water if the cable jacket is compromised.


PET Tape (Mylar)                                     
A PET tape (Mylar) is a polyester type of tape used to wrap around the internal wires and aluminum foil tape is used to cover the PET tape to provide additional protection and cable shielding.  AL/PET (Aluminum/Polyester) tapes provide more protection by increasing the metallic coverage without adding increased thickness to the diameter of the cable and are normally found in shielded cables, while the water blocking tape and water blocking gel and polyethylene jacket are used for direct burial cables. The regular Shielded Cables without water blocking tape, water blocking gel, or polyethylene jacket would not avoid dampness underground and need to be used in conduit.


Water Absorbing Yarn                             
A Fiber or Yarn treated with SAP (Super Absorbing Polymer) is an important water-blocking material. When the cable jacket is broken and penetrated, moisture and water are absorbed and swell up and block the water away from the internal wires.
Syston’s audio direct burial cables are constructed with water-absorbing yarn to deliver and maintain a pure and realistic sound.

Which Direct Burial Cables Should You Use?
The tape and yarn construction tends to be less messy to work with and adds another layer of protection and tensile strength to the cable. The gel-filled provide excellent water-blocking protection, but it requires more cleaning and preparation time than the tape.

Applications for Outdoor and Direct Burial Cables
Outdoor rated and Direct Burial cables that are available from including Ethernet, coaxial, audio speaker, irrigation, tracer, and lighting cables. Expand your internet connection and digital TV signal from the router in the main house to your guest home, detached garage, or outdoor entertainment areas. Add audio speaker connection in the backyard area, whether it is by aerial or through underground conduit, to provide outdoor music and sound from your stereo and television. Increase your safety and security by running Ethernet, RG59, or RG59 Siamese cables for your security camera system. Install landscape lighting cable to your outdoor lights to brighten your front and backyard landscape.
Syston’s landscape lighting cables are made with a black-colored jacket for excellent UV (ultraviolet) resistance, moisture-proof, and lower temperature durability.

Installing Outdoor and Direct Burial Cables
It is highly recommended to add surge protectors to Ethernet cable for aerial installation to protect from lightning strikes. Be sure to no existing pipes or utility wires is present and keep Ethernet cable at least 8 inches away from power lines and all buried cable should be at least 2 feet in depth. Waterproof connectors should be used in outdoor connections unless the wiring is done indoor or in an enclosed area like inside a garage. Future landscaping projects should be considered before installing Direct Burial cables.  Consider using conduit for all outdoor-rated cable if you plan to upgrade your cable in the future. Conduit provides additional protection against the elements and it will be easier to replace an old cable by pulling a new cable through the conduit. To prevent condensation and moisture collection inside the conduit, it is recommended that you seal and pressurize the conduit.

Click below for all Syston’s Outdoor and Direct Burial cable options:
Landscape Lighting, Irrigation & Tracer:

For all your Outdoor-rated and Direct Burial Cable needs, contact Syston Cable Technology. We have a vast range of bulk cables in outdoor and direct burial rating for your low voltage applications.

As always we are here to help, and if you have any questions about any Syston Cable products, please feel free to contact us via our website or Facebook page.


**Written by Syston Cable Team**