Under the new NFC 18-510 standard, working on disconnected network requires earthing on either side of the work area. The DLT8 is the only means authorised by the standard for creating the opening necessary in the earthing circuit to take certain measurements.

The voltage limiting device is a single-phase device designed for use on HV lines.

It is designed to be inserted in the earth circuit so as to be able to take measurements with a circuit breaker testing device for example.

The voltage limiting device has two positions:

"OPEN" (position for taking measurements)

- it protects users against accidental voltage feedback by re-forming the earthing circuit.

- It limits the voltage at its terminals to under 50V.

In the CLOSED position, it re-forms the earthing circuit.

Allowable short-term current : 40 kA

NB: The maximum allowable short-circuit current (I -t) by an earthing and short-circuiting device will be given by the element subject to the weakest current in the device's chain.

This value is clearly identified on the device on a short-circuit cable and the user will always need to check before use whether the device's Isc is appropriate to the use and the relevant short circuit risk.

Duration 1 second

Peak current 100 kA

Permanent current that can flow through the DLT8 in the CLOSED position : 400 A

Allowable nominal current (§5.2 of specification HM-21/97/057A) that can pass through the voltage-clipping device in the OPEN position: 40 A

Maximum allowable current (§6.5.1.4 of specification HM-21/97/057A) that can pass through the voltage-clipping device in the ON position: 100 A

Maximum voltage at the DLT8 terminals: 50Vrms.

Max. tightening torque necessary: 20 Nm