A close nipple is a short length of threaded conduit designed to connect two enclosures or electrical boxes in close proximity. Unlike chase nipples, which are used to attach a conduit to an enclosure, close nipples have threading on both ends and no shoulder, allowing them to screw tightly between two fittings without much space in between. Chase nipples, on the other hand, are typically used with lock nuts to secure a conduit to an enclosure through a knockout hole. Both conduit fittings are essential for different connection purposes in electrical systems but serve distinct roles based on the type of installation needed.

Yes, chase nipples can provide grounding when properly installed. When used in conjunction with a locknut, they establish a secure metal-to-metal connection between the conduit and the electrical enclosure, which helps maintain electrical continuity and grounding. This is important for ensuring the electrical system is properly bonded and safe from electrical faults. However, it’s essential to ensure that the installation follows code requirements for grounding and bonding, as additional grounding conductors or conduit bushings may be required depending on the application and local regulations.

Chase nipples are generally compatible with rigid metal conduit (RMC), intermediate metal conduit (IMC), and electrical metallic tubing (EMT). They are used to secure these conduits to electrical enclosures, ensuring a proper connection and bonding. However, they are not typically used with flexible conduits or non-metallic conduit systems like PVC, since these systems require different fittings. It’s important to ensure that the threading and conduit size match for compatibility. Additionally, for applications where corrosion resistance is needed, chase nipples made from appropriate materials, such as zinc-plated steel, should be used.

Chase nipples typically comply with industry standards such as UL (Underwriters Laboratories) and CSA (Canadian Standards Association) certifications. These standards ensure that the fittings meet safety and performance requirements for use in electrical installations. UL 514B, which covers fittings for conduit and cable assemblies, is the most common standard chase nipples adhere to in the United States. In Canada, CSA C22.2 No. 18 is the applicable standard for electrical fittings. Compliance with these standards guarantees that chase nipples are tested for durability, grounding reliability, and safe operation in electrical systems.

Chase nipples are available in a range of standard sizes to accommodate different conduit diameters. Common sizes typically range from 1/2 inch to 4 inches. These sizes correspond to the size of the conduit they are used with, such as rigid metal conduit (RMC), intermediate metal conduit (IMC), or electrical metallic tubing (EMT). Smaller sizes, like 1/2 inch and 3/4 inch, are used for lighter duty applications, while larger sizes, such as 2 inches or more, are used in industrial or heavy-duty electrical installations. Proper sizing is crucial for ensuring a secure fit and maintaining the integrity of the electrical system.