ECN Forum Forums General Topics of the Trade Non-US Electrical Systems & Trades Main Switch or Circuit Breaker?

From the Draft for Public Comment for AS3000-
2.5.1.1 Consumers' mains
Overcurrent protection of consumers' mains shall be arranged as follows:
(a) Short circuit protection and overload protection shall be provided at the origin of the
consumers' mains (the point of supply); or
(b) Short circuit protection shall be provided at the origin of the consumers' mains and
overload protection shall be provided at the main switchboard; or
(c) Short circuit protection need not be provided where -
(i) Overload protection is provided at the main switchboard; and
(ii) The consumers' mains are constructed and installed in such a manner as to
minimise the risk of short circuit.
Notes
1. Single core insulated and sheathed cables enclosed in Heavy Duty PVC conduit to
AS/NZS 2053 are deemed to satisfy this provision.
2. Underground wiring or fire rated wiring enclosures may also be used to satisfy this
provision.
3. An electricity distributor's service protective device may provide short circuit protection for
consumers' mains.