ADR233B
Ref ID : ADR233B/IM/I&P
Rev No. : 05
Page No. : 53 of 479
2.3.10 Earth Connection
Every device must be connected to the cubicle earthing bar. Earthing terminal is provided on
back side of the relay. Ensure that the relay earthing is connected to the local earth bar. With
several relays present make sure that the copper earth bar is properly installed for solidity
connecting to the earthing terminal of each relay equipment box.
Before energizing the equipment it must be earthed using the protective conductor terminal (if
provided) or the appropriate termination of supply plug in case of plug connected equipment.
The protective conductor (earth) connection must not be removed as the protection against
electric shock provided by the equipment would be lost. The recommended minimum protective
conductor (earth) wire size is 2.5 mm² or as per industry standard practice. The protective
conductor (earth) connection must be of low-inductance and as short as possible.
Note: To prevent any possibility of electrolytic action between brass or copper ground conductors and
the rear panel of the product, precautions should be taken to isolate them from one another.
This could be achieved in several ways, including placing a nickel-plated or insulating washer
between the conductor and the product case, or using tinned ring terminals.
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