Switchboard form checker

AS/NZS 3000:2018 Clause 2.5.5 covers a switchboard at or over 800 A per phase. Enter the rating and AmpSize tells you whether the board meets that trigger. Clause 2.5.5.1 also asks you to insulate or separate the incoming supply conductors, on every route. Clause 2.5.5.2 then sets out the internal separation the board needs.

Appendix K Paragraph K6.2 names Form 3b, Form 4a and Form 4b, and the same forms with the i, h and ih suffixes. Table K2 shows what each form separates. Appendix K is informative, so treat these as an example route to Clause 2.5.5.2 rather than a figure the standard sets.

Clause 2.10.2.2.1 sets 1.0 m from every face that needs access. A domestic installation may use 0.6 m at the face of the board. AmpSize applies that relief to the front face. Other faces keep 1.0 m. The clause sets a 0.6 m unimpeded space around the board. Read the clause for the door and switchgear positions it assumes.

Clause 2.10.2.2.2 sets two exit paths, well apart, where you must enter a room to reach the board. That applies from 800 A per phase, or over 3 m long. One path is enough if 3 m stays clear in front with doors open and gear drawn out. Other boards need enough exit paths, with no set count.

The tool reads AS/NZS 3000:2018 incorporating Amendments 1, 2 and 3. Amendment 2 rewrote Clause 2.10.2.2. Amendment 3 only removed the AS/NZS 3439 references from Clause 2.5.5. The tool holds Clauses 2.5.5 and 2.10.2.2 and Appendix K Paragraphs K6.2, K6.4 and K6.5. Rated diversity factor and temperature rise checks sit in the AS/NZS 61439 series, so the tool holds neither.