#GROUNDING ELECTRODE CONDUCTOR SIZING INSTALL#

Sorry if these seem like trivial questions what I think I know and what I see are two completely different things. Provide ground bars, bolted to the housing, with sufficient lugs. Am I missing something, or could you simply bond an underground water pipe with a #4 and forgo the ground rods altogether? The same question with a CEE? For service entrance equipment, connect the grounding electrode conductor to the ground bus.

#GROUNDING ELECTRODE CONDUCTOR SIZING INSTALL#

I have never seen an install without the ground rods. In these scenarios shouldn't the GEC and bonding jumper be a #4? The same is true of a system that may have an CEE and a ground rod. What I don't get is why #6 is allowed when a metal underground water pipe is bonded (maybe it shouldn't be). Grounding electrodes of pipe or conduit no smaller than trade size and when of. Rather than do the resistance test, they pound a second rod per E3508.4. the points of connection of the grounding electrode conductor and the. I see that E3503.1 fn d says, in part, 'Where the sole grounding electrode system is a ground rod or pipe as covered in Section E3508.2, the grounding electrode conductor shall not be required to be larger than 6 AWG copper or 4 AWG aluminum.' Note that a grounding electrode conductor is permitted to supply or serve any number of grounding electrodes but must be sized for the largest grounding electrode conductor required. NEC Table 250.66 is used for sizing grounding electrode conductors for alternating current systems. Each rod has a #6 conductor to the panelboard. The minimum size of each grounding electrode conductor to the individual grounding electrode is shown in Figure 6-5. Specified in table 250.122 the EGC connects individual loads back to the equipment ground bar in a panelboard, motor control center, etc. It’s important to understand the difference between the grounding electrode conductor and an equipment grounding conductor (EGC). What I am used to seeing is (2) grounding rods installed 6' apart. The values listed in table 250.66 are therefore minimums. In examining E3503.1 for a 2/0 200a service (2/0 being the governing factor in the table, not the amperage), I see that the minimum conductor size is 4ga copper. IRC states that the GEC and the bonding jumpers must be sized in accordance with E3503.1. I'm going to lay out how I interpret the code, and I'd appreciate if you guys could steer me in the right direction. Ok, not my forte` (heck I'm just getting the lingo down), but I am seeing installations approved that don't appear correct.

Grounding electrode conductor sizing