Question Answer Standard/Clause
I'm doing some works for a pool
installer and have two questions. Arm’s reach is defined as: AS/NZS 3000:2018
1. The new 2018 Wiring Rules say
'within arm’s reach' — is there a
measurement or distance for arms
2. Some of the pools being installed
are fiberglass pools. Am I still required
to earth the concrete edge beam and
the fence and other fittings that are
within arm’s reach?
A zone extending from any point on a surface where persons usually
stand or move about, to the limits that a person can reach with the
hand in any direction without assistance (e.g. tools or ladder).
In relation to a swimming pool this is measured on a horizontal
plane 1.25m from the edge of the water. Figure 5.6
An equipotential bonding conductor shall be connected between
the conductive pool structure and the pool equipotential bonding
conductor connection point. 5.6.3
An equipotential bonding conductor shall also be connected to
items of electrical equipment and conductive fixtures and fittings.
The equipotential bonding conductor shall be connected to earthing
conductors associated with each circuit supplying the pool or spa,
or the earthing bar at the switchboard at which the circuits originate.
I have been asked to install a circuit
to an isolator for a split system air
conditioner in a domestic home.
Yes. In a domestic and residential installation additional protection
by RCDs with a maximum rated residual current of 30 mA shall be
provided for all final sub-circuits. AS/NZS 3000:2018
1. Yes. Where the circuit protection on a switchboard in domestic
or residential situation is replaced, additional protection by RCDs
with a maximum rated residual current of 30 mA shall be provided
for all final sub-circuits.
2. In a non-domestic or non-residential setting, where circuit protection
on a switchboard is replaced, additional protection by RCDs with a
maximum rated residual current of 30 mA shall be provided for final
sub-circuits with a rating not exceeding 32 A, supplying:
» direct connected hand-held electrical equipment e.g. directly
» direct connected electrical equipment that represents an increased
risk of electrical shock. AS/NZS 3000:2018
Yes. The roof top isolator’s function provides the ability to easily
de-energise the cable from the panels to the inverter at the source
of supply. The isolator at the inverter is to enable the inverter to be
de-energised so it can be worked on safely. If the isolator is a long
way from the panels, then you have a section of cable that is not
able to be isolated easily. AS/NZS 5033
Do I need to put this circuit on an
I am replacing and upgrading a
switchboard at a residential home.
1. Do I need to put RCDs on all of the
circuits, including the oven and
electric hot water service?
2. Is this the same if the switchboard
is for a factory or other non-
Do I need a D.C. isolator at the solar
panels if the inverter is mounted on
the wall that is directly below the
Clause 220.127.116.11 in AS/NZS 5033
First paragraph states an isolator shall be adjacent to the array
(within 3m and visible from each location).
Second paragraph states if the inverter is not in line of sight or more
than 3m from the array, then another isolator is required at the inverter.