Routine verifications in compliance with

Routine verifications represent the final technical intervention

of the assembly manufacturer before the delivery

of the switchgear assembly completed and before

invoicing and shipment to the customer. The Standard

describes the verifications in the following order:

- Degree of protection IP provided by an assembly

enclosure

It represents the first routine test prescribed by the

Std. IEC 61439-1.

Actually it is reduced to a visual inspection.

- Clearances and creepage distances

Clearances usually results, also at visual inspection,

quite higher than necessary.

As regards creepage distances, reference shall be

made to the values defined by the Standard (shown

in Table 9.6, clause 9.2 of this Technical Application

Paper); for further details reference shall be made to

clause 12.6 of the Technical Application Paper, “Routine

verification of impulse withstand voltage”.

- Protection against electric shock and integrity of

the protection circuits

It is based on a visual inspection and on some verifications

of the correct mechanical tightness on a random

basis. The proper realization of the protective circuit

is verified:

- visually (e.g. checking of the presence of devices

which guarantee contact for earthing conductor

continuity etc.);

- mechanically (checking of connection tightness on

a random basis);

- electrically (verification of the circuit continuity).

The tools used are a tester and a torque wrench.

- Incorporation of built-in components

The real correspondence of the installed equipment

with the assembly manufacturing instructions is

checked.

- Internal electrical circuits and connections

Verification on random basis of correct tightening of

terminals is required.

- Terminals for external conductors

Correspondence of cables and terminals is checked

according to the wiring diagram.

- Mechanical operation

On a random basis levers, pushbuttons and any possible

mechanical actuating element are operated.

- Dielectric properties

See clause 12.6.

- Wiring, operational performance and function

The nameplate is checked and, if necessary, electrical

operation and any possible safety interlocks shall be

verified by test.