Wiring requirements for secondary distribution boxes during construction
This fact sheet explains how to apply the requirements shown in AS/NZS 3012:2019 Electrical installations – construction and demolition sites (AS/NZS 3012:2019), which is called up as a mandatory standard by section 163 of the Work Health and Safety Regulation 2025 (WHS Regulation). In this guide, we'll break down everything you need to know to install a distribution box correctly and confidently. Choose the right box based on environment (indoor/outdoor), load capacity, and durability. However, exposure to weather, frequent relocation, rough use and other condi-tions not normally encountered with conventional wiring systems necessitate special consideration not require in other applications or in completed structures. The distinction between 1P and 2P circuit breakers plays a pivotal role in determining the appropriate protection level for various circuits. This document represents the minimum requirements and specifications for the installation of the electrical underground distribution systems fed from padmounted transformation, serving Secondary Service Accounts, to be transferred to Oncor Electric Delivery Company ownership.
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