Bonding Gas / Electric 

In older properties or those with metal service lines, plumbing and stray electrical wires can occasionally touch, causing metallic pipes to become electrically charged. If you touch a charged metallic pipe while simultaneously touching an appliance connected to the mains (like a kettle or a sink), your body completes a circuit, leading to an electric shock. Bonding ensures all metalwork sits at roughly 0 Volts, neutralizing that dangerous potential difference.