What to consider when choosing cord grip options…
When choosing cord grip options for use in both industrial and commercial facilities you’ll want to keep a few things in mind. Essentially, cord grips provide the means for passing cord or cable into an enclosure, through a bulkhead, or into a control device such as a switch.
Because they secure the cable where it enters the enclosure, or where it terminates into a hardwired application, grips prevent cable pull-out or premature fatigue. They can be used in both wet and dry locations since they seal the electrical connection against dirt, dust, oil, moisture, chemicals or other corrosive materials.
Their typical applications include wiring enclosures, processing and material handling equipment, pumps, motors, manufacturing automation robotics and various other machine tools or equipment. There is no one-size-fits all model for choosing cord grip solutions, which is why manufacturers now offer a variety of add-ons and options.
Regardless of the choice, the four basic criteria by which users select the proper cord grip for their application is size, thread type, style and attachments, and construction materials.
Basic Criteria for Choosing Cord Grip Options
Size — The size of cord grip to use depends on three things: the outside diameter (OD) of the cable; whether single or multiple cable terminations are required; and the size of the knockout or threaded opening.
Thread type — If an application features a threaded opening, the cord grip used will be determined by its thread type, which will be NPT, Pg, or ISO Metric.
Style and attachments — Two basic styles of grips are often offered: straight and 90°. To decide between them, the decision is often based on several things: cable orientation and how the cable fits into the enclosure or system; spacing and turning radius of multiple terminations; space on the outside of the enclosure; and how a user wants a piece of equipment to look.
Construction material — The five different materials to choose from include:
- Diecast zinc: This is well-suited for residential and commercial applications, but has inferior tensile strength and soft, imprecise threads
- Aluminum: The most common material of construction, it offers superior machine-ability, durability, and performance.
- Nylon: Grips made from nylon are lightweight yet durable. Because they’re molded instead of machined, they are ideal for use in damp environments and corrosive applications.
- Valox: Although expensive, these have superior corrosion-resistance and is non-hygroscopic, which means it won’t absorb moisture.
- Stainless steel: These offer the highest levels of durability in severely corrosive environments. Compare manufacturers.
Additional Choosing Cord Grip Add-Ons
Other customized solutions include multiple-hole bushing, threading, grommet materials, wire mesh, locknuts and O-rings, slit brushings, cable style, different kinds of plating materials, as well as nickel-plated brass and Delrin construction materials.
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