Main equipotential bonding

[diystuey]

I can't see any evidence of main equipotential bonding to the water and gas pipes entering my house.

I have checked the resistance between the main earth terminal and the pipes and the resistance is less than one ohm, but i'm a little alarmed that i can't see the connections.

Could the resistance measurements be this low if there was no equipotential bonding?

 

[DetlefSchmitz]

Could the resistance measurements be this low if there was no equipotential bonding?

Easily.

The main point is that the main bonding needs to be visible for inspection. So you should add it.

 

[ricicle]

A low reading can be possible via the cpcs of appliances connected to water and gas (boiler being the prime example).
Although not set in stone there is a rule of thumb suggesting that 0.05 Ω is a low enough resistance between the MET and extraneous conductive parts.
A 10mm² connection is required to ensure proper bonding, especially if you have a PME supply.