What is the strain relief cable gland?
Sep 15, 2022
What is the purpose of a strain relief cable gland?
Whats is strain relief cable gland?
Strain relief, also commonly referred to as bend relief, is important to the electrical and mechanical integrity and overall performance of medical cable assemblies. Strain relief is used to provide a transition from a flexible cable to a rigid connector or connection point.
Strain reliefs or cable glands can provide protection for wires and cables by securing the cables of power cords to panels of electrical equipment. It helps prevent stress and damage as it passes through the equipment panels. While it doesn't relieve the stress on the cable as it leaves the device, it does relieve the stress on the electrical connections and circuits inside the device.
The term "strain relief" is commonly used in North America, while "cable joints" are commonly used in Europe and the rest of the world.
How to connect to the power cord?
Wire connection refers to how the strain relief/cable gland and wires are assembled together. Many slid on the ropes and were then tightened to the jacket. Some are permanently molded into the cable. Molded strain relief/cable glands bond to the cable to hold the cable in place and fill the splice. There is also a mechanical snap-on strain relief/cable gland. These are not liquid tight and snap into cutouts with squares or flats like they are molded.
What is material of strain relief/cable glands?
Strain relief/cable glands are available in many different materials such as nickel plated brass, nylon and stainless steel. PVDF (polyvinylidene fluoride) is a good choice for food preparation equipment because it does not retain oils, chemicals or bacteria that can damage or poison food. It should be noted that nylon fittings installed in threaded connections and exposed to high temperatures should be retained with a sealant to avoid loosening of the connection during temperature fluctuations.
How to Mount Strain Relief/Cable Gland to Frame?
Slip-on strain relief/cable glands are threaded and usually come with a nut, offering two methods of attaching the panels. One option is to make a threaded hole to fit the size used and simply screw it into the panel. Another method is to determine the diameter of the opening and use a strain relief/cable gland close to the size of the hole. The lock nut secures it to the panel. Both methods provide a watertight seal if used with an O-ring. In contrast, both the molded version and the mechanical snap version are installed by using the cut-out mounting holes in the panel and snapping the strain relief/cable gland into place. This allows for less assembly time, but doesn't guarantee a watertight seal, otherwise the power cord might not be as secure as the slide-in one.
Dedicated body styles
Specific body styles are available for many different applications. Generally, strain relief/cable glands are available in two common configurations: dome and flexible.
Dome-style strain relief/cable glands are designed to protect wires entering equipment.
Flex Style Strain Relief/Cable Gland provides flexible bend protection for power cords (A) entering equipment. They are designed to eliminate the possibility of cord kinking when pulled at extreme angles (B). Coiled springs wrap around the rope and add strength where the rope is most vulnerable to damage
What is the thread type of cable gland?
The different types of mounting threads available include: American Standard NPT (National Pipe Thread); PG (Stahlpanzerrohr-Gewinde; also known as Panzergewinde) is the European Standard (German Military Thread); and Metric, which is the universal thread used worldwide . The thread system chosen depends on where the equipment will be used.
If the mounting panel being used is threaded, a matching strain relief/cable gland should be selected. If the panel has clearance holes, the strain relief/cable gland should be selected based on where in the world the part will be used. For example, if the market is in North America, choose the NPT thread series. If in the EU, choose metric threads for new equipment and installations. PG threads are typically used as replacement parts for existing installations.
For more information on strain reliefs/cable glands available through Boluncablegalnd, see the Strain Reliefs and Featured Products page.
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