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Plumbing - Separation of services

This table relates to the article - Separation of common services which was published in Connections magazine - Issue 18 (November 2020).

Table 1 - Summary showing separation distances (in mm) between different below ground services

Below Ground services (General advice only based on the  AS3500 series)
Applies to A and B

Water Service supply

(Connected to Drinking
Water Supply)

Drainage

GasElectricity
A.Yes

Cold Water AS3500.1:2018
Clause 5.2

(Drinking water)

Heated
Water

Under-ground sanitary drainage

Under-ground stormwater drainage

Consumer gas pipe

Low Voltage Electrical Supply Cable

B.Yes

Not greater than DN65

Not greater than DN65

AS3500.4 :2018
Clause 4.2.

AS3500.2 :2018_V3 Clause 3.6

AS3500.3 :2018 Clause 6.2.6

AS5601.1 Clauses 5.4

AS3000 Clause 3.11.5

Non-Drinking water AS3500.1 Clause 9.3.2.2

Identified by an purple marker tape laid 150mm above the installed pipe to AS/NZS26248.1

300

300

300

100

300

100 for </= DN65 or 300 for >DN65

100 for </= DN65 or 300 for >DN65

Consumer gas pipe

AS5601.1

Clauses 5.4

Identified by an orange marker tape laid 150mm above the installed pipe to AS/NZS26248.1 and mechanically protected

100

300

100

100

100

N/A

100

Consumer gas pipe

AS5601.1

Clauses 5.4

Neither indicated nor mechanically protected

600

600

600

600

600

N/A

300

Low Voltage Electrical supply cable

AS3000

Clause 3.11.5

Identified by an orange marker tape laid 150mm above the installed pipe to AS/NZS26248.1 and mechanically protected

100

300

100

100

100

N/A

100

Low Voltage Electrical supply cable

AS3000

Clause 3.11.5

Neither indicated nor mechanically protected

600

600

600

600

600

N/A

300

Underground sanitary drain AS3500.1 Clause 5.2.6       See Figure 5.2.6

100

100

100

100

300

N/A

N/A

Communication cable AS3500.1 Clause 5.2.5

100

100

100

100

100

N/A

N/A

Notes:

  1. Minimum separation of conductive enclosures to low voltage earthing electrode 500mm for water, sanitary drainage and gas and 600mm for stormwater drainage.
  2. Low voltage is voltage that exceeds extra-low voltage (not exceeding 50 V ac. or 120 V ripple-free dc.) but not exceeding 1000V ac. or 150 V dc.
Updated: 26 Nov 2020