The time ‘seventeenth version customer Unit’ is now one of the most commonly used and misunderstood in the Australian electrical vernacular. Through lack of industry conformity, the word has meant a fuse board furnished with RCDs. but: this doesn’t always suggest that it abides using seventeenth version policies and certainly does no longer mean that different designs aren’t 17th version compliant.
Let us first remind ourselves of what the seventeenth edition policies, without a doubt, implied in phrases of circuit protection: The seventeenth Ed policies country pretty clearly that every one circuit needs to be included against earth leakage, which means, in layman’s terms that people are included against electric powered surprise.
This could be finished using an RCD (Residual present-day tool), which protects a bank of circuits against earth leakage concurrently, or an RCBO (Residual Current Breaker with Overload safety), which protects an individual circuit.
Every setup is specific depending upon some variables together with the number of circuits, the styles of the tool being blanketed on every circuit, the hundreds on man or woman circuits, and the path of the purchaser’s budget. For this reason, all client gadgets are configurable upon installation and may consequently shield towards earth leakage using an aggregate of RCDs, RCBOs, or each.
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In general, each of the 4 commonplace designs of the Australia fuse board, essential switch, cut up Load, high Integrity, and twin RCD meet the seventeenth version’s requirements. However, depending on the installation variables, it becomes apparent that some designs provide extra compliance than others by enabling a higher ‘department of installation or separation of circuits, which prevents ‘nuisance tripping’.
The dual RCD testing board became firstly considered the best way to [ cheaply ] satisfy the seventeenth Ed Regs, which is why it became referred to as a ‘seventeenth version purchaser Unit’. However, this configuration does now not allow for any separation of circuits and, consequently crucially, does not allow for a separate smoke alarm circuit and makes no provision for nuisance tripping.
Underneath the Wylex device, the best customer unit that scores 5 stars is the older kind of major switch purchaser unit. It permits for full loading of RCBOs, consequently supplying entire unbiased circuit safety against earth leakage. Excessive Integrity and break up Load purchaser devices both rating 4 stars as they allow for a positive amount; however, not the entire circuit division.