Download MEW E101 April 2013 (pdf, 280kb) - NSW Public Works

Part 2 - Switchboards and Associated Equipment
202.1.2 Custom-built Assembly Type “CT”
The following details shall apply to Custom-built Assemblies Type “CT”:
(a) A Type “CT” assembly shall be a stationary “cubicle-type assembly” as defined in
AS/NZS 3439.1:2002.
(b) A Type “CT” assembly shall comply with AS/NZS 3439.1:2002 as defined by the
following requirements:
(i) Form of separation shall be Form 1.
(ii) The degree of protection after installation in accordance with the
manufacturer’s instructions shall be IP51 for indoor installation and IP56 for
outdoor installation.
(iii) Assemblies shall be front access with top and/or bottom cable entry.
(iv) Assemblies shall be floor mounted or wall mounted. Wall mounting is
acceptable only if the frontal area of the assembly has an area less than 2
square metres.
(v) For outdoor switchboards containing busbars, pollution degree 3 shall apply
at locations further than 1km in a direct line from the coast or at altitudes
below 1000 metres. Otherwise, pollution degree 4 shall apply.
For indoor switchboards, pollution degree 3 shall apply.
(vi) The following safety measures against direct contact shall apply:
• Requirement of a key or tool to gain entry into the switchboard. (Meet
clause 7.4.2.2.3 a) of AS/NZS 3439.1:2002.)
• Shielding all live parts in such a manner that they cannot be
unintentionally touched when the door is opened or the cover is
removed. (Meet clause 7.4.2.2.3 c) of AS/NZS 3439.1:2002.)
(vii) Assemblies shall be Partially Type Tested Assemblies or Type Tested
Assemblies with type test certificates or satisfactory test reports for the type
tests listed in clause 8 of AS/NZS 3439.1:2002. Documentation shall be
available to demonstrate that the results of type tests were satisfactory. The
testing facility shall be accredited by NATA or registered with the
Association of Short-Circuit Testing Authorities.
(viii) The standard Internal Arcing-Fault Test specified in Annex ZD of AS/NZS
3439.1:2002 (limited arc, initiated on the load side of a protective device
within the functional unit being tested) shall be met and a test certificate
demonstrating that the results of the type tests were satisfactory shall be
available. The testing facility shall be accredited by NATA or registered with
the Association of Short-Circuit Testing Authorities.
202.1.3 Custom-built Assembly Type “CU”
The following details shall apply to Custom-built Assemblies Type “CU”:
Note that type test certificates or satisfactory test reports for the type tests listed in
clause 8 of AS/NZS 3439.1:2002 are not required.
(a) A Type “CU” assembly shall be a stationary “cubicle-type assembly” as defined in
AS/NZS 3439.1:2002.
(b) A Type “CU” assembly shall comply with AS/NZS 3439.1:2002 as defined by the
following requirements:
(i) Form of separation shall be Form 1.
(ii) The degree of protection after installation in accordance with the
manufacturer’s instructions shall be IP51 for indoor installation and IP56 for
outdoor installation.
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MEW E101