NFPA 70: National Electrical Code Article 250 covers the minimum requirements for grounding and bonding and, although the NEC lists requirements to abide by, it should not be taken as a design manual.

Bonded (bonding): Connected to establish electrical continuity and conductivity. Bonding is not to be confused with grounding. Two pieces of equipment bonded together does not necessarily mean both pieces of equipment are grounded. However, it assures that the metallic parts of the bonded equipment can form an electrically conductive path for electrical continuity.

Grounded (grounding): Connected (connecting) to ground or to a conductive body that extends the ground connection. Grounding is not to be confused with bonding. Equipment may be bonded together, but it is not considered grounded unless it is connected back to the ground.