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

Part 2 - Switchboards and Associated Equipment
For Common Control Compartments:
• 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.)
For Distribution Compartments with one main protective device plus a
number of subcircuit protective devices:
• 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.) for the compartment door
and for the escutcheon.
(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 special Internal Arcing-Fault Test (unlimited arc, initiated on the line
side of the protective device within the functional unit being tested) required
by Appendix ZD.6 of AS/NZS 3439.1:2002 shall be met and a test certificate
demonstrating that the results of the type tests were satisfactory shall be
available. The duration of the test shall be chosen by the manufacturer
according to the time response of the electrical protection devices. If details
of these devices are not known, a power supply duration of at least 100
milliseconds shall apply. The testing facility shall be accredited by NATA or
registered with the Association of Short-Circuit Testing Authorities.
202.1.5 Custom-built Assembly Type “DU”
The following details shall apply to Custom-built Assemblies Type “DU”:
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 “DU” assembly shall be a stationary “cubicle-type assembly” or ‘multicubicle-type
assembly” as defined in AS/NZS 3439.1:2002.
(b) A Type “DU” assembly shall comply with AS/NZS 3439.1:2002 as defined by the
following requirements:
(i) Form of separation shall be Form 3b or 3bi, 3bh, 3bih, 4a, 4b, 4ah, 4ai, 4aih,
4bh, 4bi, 4bih.
(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.
(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:
For Main Incoming Supply Compartments, Motor Starter Compartments and
Distribution Feeder Compartments with one feeder in the Distribution Feeder
Compartment:
Page 30
MEW E101