In the realm of photovoltaic system installations, the diversity of available methods for both system design and ground connection presents a significant opportunity. Installation modes play a crucial role in determining the overall efficacy of the system. In this context, we will delve into two common methods for specific ground connection of photovoltaic arrays, highlighting their distinct requirements.
First and foremost, let's understand the significance of the grounding system. It is an indispensable component in any electrical installation, serving three critical purposes:
1. Limit the tension of the metal masses with respect to the ground.
2. Ensure the performance of the protections.
3. Eliminate or reduce the risk of a failure in the electrical equipment used.
In other words, the grounding system is a safety backup for all types of electrical installations. In this way, a good assembly of photovoltaic modules of this type is essential to maintain safety.
Now, there are two types of PV arrays for ground connection: using the EGC cable (Equipment Grounding Conductor), or through WEEBs. Below we will show its features and specifications.
EGC Wired Module Arrangement: In this setup, photovoltaic modules are mounted on structures using mechanical clamps and clips that are not intended to function as grounding conductors. As per the National Electric Code (NEC) 690.43, all exposed metal must be grounded. The EGC serves as a conduction line, connecting the structures and frames of the photovoltaic modules. It forms connections with each photovoltaic module frame and all members of the shelf. Additionally, it can be linked to the AC EGC, which is then connected to the alternating current (AC) ground system.
2. Arrangement of Modules with WEEBs: WEEB equipment joining washers come into play when connecting photovoltaic modules either to one another or to the structure for grounding purposes. Compliant with NEC 690.43 and 250.136 (A), these washers enable electrical connections between the equipment frame and mounting structures, which, in turn, connect to the ground.
It is crucial to note that for the WEEBs to be considered part of the grounding system, the mounting structure must be connected to an equipment grounding driver. Therefore, WEEBs can only be employed as a constituent of the EGC system.
In conclusion, a thorough understanding of these ground connection methods is imperative for a successful and secure photovoltaic installation. As a forward-looking solar technology company, we strive to implement the most appropriate grounding solutions, ensuring optimal performance, safety, and compliance with industry standards.
