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2. Technical and
General Question Corner
Q. What is the optimum number of RCDs in a
domestic installation?
A. The number of RCDs in a domestic
installation is dependent on the size and layout of the
installation. Consideration should be given to the effect on the
occupants and services in the event of an RCD tripping.
In general, it is recommended that a minimum of two RCDs be
provided for an average domestic installation with approximately
half the lighting and general purpose socket outlets on each RCD.
Q. Why shouldn't TPS sheathed cable be
installed in contact with polystyrene?
A. Polystyrene and similar insulation
materials such as polyurethane in contact with TPS cable causes
migration of the plasticiser in the PVC cable sheath leaving the
sheath hard and brittle.
It is therefore recommended that the cable be separated from
the polystyrene by a physical barrier such as PVC conduit. PVC
conduit does not contain plasticiser so it is unaffected.
Alternatively, cable with a non-migratory PVC sheath could be
used.
Q. To what Standard are appliances required to
be tested?
A. After any electrical repairs are carried
out to an electrical appliance the appliance is required to be
tested in accordance with AS/NZS 3760.
Q. Is it a requirement to keep the results of
appliance tests?
A. While it is not a legal requirement to
keep the results of appliance tests it is recommended that a copy
of the results be retained. This will enable the person who
carried out the tests to provide evidence of such testing if
required for any reason in the future.
Q. How will people in the industry be able to
keep up to date with all the changes that keep being made to the
regulations and the Standards?
A. The Board has an overall strategy to make
all information available to those people who uplift practising
licences. As such the Board will continue to provide all
amendments to the Act, regulations and other documents that are
cited in the regulations to people with practising licences.
Q. Why was the date for comments on the Boards
practising licence refresher course document extended?
A There was considerable disquiet in the
industry that the document was not distributed to all people who
were ultimately affected by it. Accordingly the comment date was
extended, the document was placed on the Boards website and an
electronic version of the document was sent to all persons whose
email address were known to the Board.
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