Introduction to UVA, CVA and DCA Switchboards & Control Panels
With the introduction of EN BS 61439 manufacturers of switchgear and control panels are required to offer verified PSC (Power Switchgear and Controlgear) assemblies to comply with the new standard. Mertech offer three types of PSCs, These are designated as UVA, CVA and DSA. UVA and CVA assemblies are verified and DCA assemblies are not.
UVA – Unitary Verified Assemblies are our Prisma Switchgear products of which we are approved system builders for Schneider. This product has been verified by Schneider.
CVA – Combined Verified Assemblies are own Mertech design products and are verified by a combination of type tests, calculations and design rules by us and our suppliers.
DCA – Design Centre Assemblies are Mertech products that due to the special requirements of the specifier or client cannot be verified to the new standard but are calculated to comply by us. This product does not claim compliance.
Verified Assembly
A verified assembly is described as a low-voltage switchgear or controlgear assembly conforming to an established type or system without deviations likely to significantly influence the performance, from the typical assembly verified to be in accordance with the EN BS 61439-2 standard.
The following is a list of the design verifications that have been performed either by test, calculation or design rules:
Routine tests are also performed to ensure compliance after manufacture.
Mertech manufactures UVA and CVA PSC assemblies utilising verified arrangements with up to 6300 Amp busbars.
Design Centre Assembly
A low-voltage switchgear or controlgear assembly, containing non-verified arrangements derived by good engineering practice from type tested arrangements which have complied with the relevant tests. This DCA falls under the same category as the old PTTA (Partially Type Tested Assembly) but cannot claim full compliance to the new standard.
Mertech manufactures DCA switchboards utilising extrapolations from our own ASTA tested busbar system and extrapolated designs from KEMA Type Tests for all other parameters.
With the introduction of EN BS 61439 manufacturers of switchgear and control panels are required to offer verified PSC (Power Switchgear and Controlgear) assemblies to comply with the new standard. Mertech offer three types of PSCs, These are designated as UVA, CVA and DSA. UVA and CVA assemblies are verified and DCA assemblies are not.
UVA – Unitary Verified Assemblies are our Prisma Switchgear products of which we are approved system builders for Schneider. This product has been verified by Schneider.
CVA – Combined Verified Assemblies are own Mertech design products and are verified by a combination of type tests, calculations and design rules by us and our suppliers.
DCA – Design Centre Assemblies are Mertech products that due to the special requirements of the specifier or client cannot be verified to the new standard but are calculated to comply by us. This product does not claim compliance.
Verified Assembly
A verified assembly is described as a low-voltage switchgear or controlgear assembly conforming to an established type or system without deviations likely to significantly influence the performance, from the typical assembly verified to be in accordance with the EN BS 61439-2 standard.
The following is a list of the design verifications that have been performed either by test, calculation or design rules:
- Mechanical properties
- Degree of protection of enclosures
- Clearances and creepage distances
- Protection against electric shock and integrity of protective circuits
- Incorporation of switching devices and components
- Internal electrical circuits and connections
- Terminals for external conductors
- Dielectric properties
- Temperature Rise limits
- Short-stand withstand strength
- Electromagnetic compatibility
- Mechanical operation
Routine tests are also performed to ensure compliance after manufacture.
Mertech manufactures UVA and CVA PSC assemblies utilising verified arrangements with up to 6300 Amp busbars.
Design Centre Assembly
A low-voltage switchgear or controlgear assembly, containing non-verified arrangements derived by good engineering practice from type tested arrangements which have complied with the relevant tests. This DCA falls under the same category as the old PTTA (Partially Type Tested Assembly) but cannot claim full compliance to the new standard.
Mertech manufactures DCA switchboards utilising extrapolations from our own ASTA tested busbar system and extrapolated designs from KEMA Type Tests for all other parameters.