In Article " Verifying Ground Connection and Fence Ground Installation ", I explained the following points:
- Verifying Ground Connection/Interconnection Installation,
- Verifying Fence Ground Installation.
Today, I will explain how to identify Correct Grounding Tools and Equipment as follows.
You can review the following Articles For more information:
7- Identifying Correct Grounding Tools and Equipment
7.1 Exothermic Weld Splice
As an electrical inspector, you must know that Splices of bare copper cables used underground in ground grids must have very low resistance and be very reliable. Periodic inspection of these splices is impossible after installation. For these reasons, Consultants often specifies that exothermic welds be used in these splices.
An exothermic weld is a fusion weld that takes place in an exothermic weld mold (or graphite mold), as shown in Figure 1.
Figure 1. Exothermic weld mold
Ground grids have exothermic weld splices wherever copper cables touch one another.
Different types of molds are used to make different kinds of welds. A figure 5 illustrates various types of exothermic welds.
Figure 5. Different types of exothermic welds
Figure 6. Unacceptable exothermic welds
7.2 Compression Tools and Dies
Figure 7. Crimping (A and B) tools, compression (C) tools, and dies (D)
After Finishing Splicing Process
After finishing splicing process, the splices must be insulated by one of the below two methods:
1- Plastic Tape
Plastic tape is commonly used to insulate bare or stripped copper conductors after they have been spliced together. After insulating, no part of the bare copper conductor should be visible. For ground conductors, this tape should be colored green.
2- Heat-shrinkable Sleeve
Heat-shrinkable sleeves are also used to insulate bare copper conductors. The sleeve is placed over the splice and then heated. Heat makes the sleeve shrink to form a tight, waterproof seal around the spliced area. This material is marked to indicate the size conductor for which it is used.
In the next article, I will explain how to identify Grounding Connectors And Bushings?. Please, keep following.