Eut Power Supply And Power Switch; Notes On Protective Devices Which Need To Install The Operator - EM TEST compact NX5 Series Operation Manual

EM TEST
3.4.

EUT Power supply and power switch

The EUT input should be connected through a properly rated power switch device, which should be located close
to the test setup. In order to ensure easy and quick access to the EUT power, the switch should be clearly and
visibly labeled as "EUT power ON/OFF".
The in-house power distribution must be equipped with a proper circuit breaker and an emergency off button as
per IEC 61010-1:2001.
Dimensioning of the mains supply and rating of fuse protection of the AC or DC power supply must conform with
local electrical codes and EUT requirements. Inappropriate arrangement, mounting, cabling or handling of the
EUT or ground can reduce or negate the effectiveness of the compact NX5's safety features.
3.4.1.

Notes on protective devices which need to install the operator

There are two different protective devices in a mains distribution system for safe operation.
A Fault current protection:
B Circuit breaker protection: A circuit breaker is an electrical switch designed to protect an electrical
3.4.1.1. Fault current protection
The standards recommend decoupling and filter capacitors to PE for decoupling surge pulses. This is the reason
for tripping fault current protection relays that interrupt the mains to the EUT supply. For eliminate the
circumstance use one of the following options:
Remove the fault current protection
This solution does not limit the current to PE. The surge test as other EMC tests with higher currents to PE are
possible. The user must take care to the circuit with no fault current protection. Only trained professional people
are allowed to perform such tests. Some countries do not allow to operate without fault current protection.
Using of insulating transformers
An insulating transformer separates the circuit from the test circuit. The Fault current detector (FI protection)
cannot detect the earth current in the EUT circuit.
The fault current safety detection function in the generator circuit is disabled. The user must respect
this circumstance. For a safe operation he must follow the electrical rulers.
Behind the insulating transformer the neutral and PE must be connected for a proper phase synchronization of
the generator. In case of a 3-phase system the user must perform similar.
Operating Manual
A residual-current device (RCD), or residual-current circuit breaker (RCCB)
is an electrical wiring device that disconnects a circuit whenever it detects that
the electric current is not balanced between line and the return neutral. In
normal circumstances, these two wires are balanced, and any difference
current usually indicates a short circuit or other electrical anomaly like a surge
impulse is present.
circuit by overload or short circuit. Its basic function is to detect a fault
condition and interrupt current flow.
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