Type-tested (TTA) and Partially type-tested assemblies (PTTA)

Type-tested assemblies (TTA)

No.	Requirement to be tested	TTA
1	Overtemperature limit	Proof of overtemperature limit by testing (type testing)
2	Insulation	Proof of insulation by testing
3	Short-circuit resistance	Proof of short-circuit resistance by testing (type testing)
4	Effectiveness of the PE conductor circuit Proof of the perfect connection between bodies, switchgear assemblies and PE conductor circuits Short-circuit resistance of the PE conductor circuit	Proof of the perfect connection between bodies of the switchgear assembly and PE conductor circuit (type testing) Proof of the short-circuit resistance of the PE conductor by testing (type testing)
5	Creepage distances and clearances	Proof of creepage distance and clearances (type testing)
6	Mechanical function	Proof of mechanical function (type testing)
7	IP protection category	Proof of IP protection category (type testing)
8	Wiring, electrical function	Viewing of switchgear assemblies including wiring and electrical function testing if necessary (unit testing)
9	Insulation	Insulation testing (unit testing)
10	Protective measures	Checking of protective measures and continuous PE conductor circuits (unit testing)
11	Insulation resistance	Proof of insulation resistance if test was not carried out

Partially type-tested assemblies (PTTA)

No.	Requirement to be tested	PTTA
1	Overtemperature limit	Proof of compliance with overtemperature limit by testing or extrapolation
2	Insulation	Proof of insulation by testing or proof of insulation resistance
3	Short-circuit resistance	Proof of short-circuit resistance by testing or extrapolation of similar type-tested assemblies
4	Effectiveness of the PE conductor circuit Proof of the perfect connection between bodies, switchgear assemblies and PE conductor circuits Short-circuit resistance of the PE conductor circuit	Proof of the perfect connection between bodies of the switchgear assembly and PE conductor circuit Proof of the short-circuit resistance of the PE conductor circuit by testing or respective design and arrangement of the PE conductor
5	Creepage distances and clearances	Proof of creepage distance and clearances
6	Mechanical function	Proof of mechanical function
7	IP protection category	Proof of IP protection category
8	Wiring, electrical function	Viewing of switchgear assemblies including wiring and electrical function testing if necessary
9	Insulation	Insulation test or proof of insulation resistance
10	Protective measures	Checking of protective measures
11	Insulation resistance	Proof of insulation resistance if test was not carried out