Guide to Internal Separation of ASSEMBLIES

UK National Annex to BS EN 60439-1:1994 (reproduced with permission of BSI) Guide to internal separation of ASSEMBLIES The internal separation of ASSEMBLIES by barriers or partitions is specified in 7.7, and is subject to agreement between the manufacturer and the user. Table NC.1 gives additional information regarding different types of construction, based on typical practice in the United Kingdom. Other types of construction are not precluded, and it is not essential to adopt any of the listed types in order to comply with the requirements of the British Standard. However, in order to achieve agreement between manufactures and users, it is recommended to adopt one of the listed types of construction. Table NC.1 Forms of separation Main criteria Sub-criteria Form Type of construction No separation Form 1 Terminals for external conductors not separated from busbars Type 1: busbar separation is achieved by insulated coverings, e.g. sleeving, wrapping or coatings 1) Separation of busbars from the functional units Terminals for external conductors separated from busbars Form 2 Type 2: Busbar separation is by metallic or non- metallic rigid barriers or partitions Terminals for external conductors not separated from busbars Form 3a Terminals for external conductors separated from busbars Form 3b Type 1: Busbar separation is achieved by insulated coverings e.g sleeving, wrapping or coatings 1) Separation of busbars from the functional units and separation of all functional units from one another. Separation of the terminals for external conductors from the functional units, but not from each other Type 2: Busbar separation is by metallic or non- metallic rigid barriers or partitions Type 1: Busbar separation is achieved by insulated coverings e.g sleeving, wrapping or coatings. Cables may be glanded elsewhere 1) Type 2: Busbar separation is by metallic or non- metallic rigid barriers or partitions. Cables may be glanded elsewhere Terminals for external conductors in same compartment as associated functional unit Type 3: All separation requirements are by metallic or non-metallic rigid barriers or partitions. The terminals for each functional unit have their own integral glanding facility Type 4: Busbar separation is achieved by insulated coverings e.g sleeving, wrapping or coatings. Cables may be glanded elsewhere 1) Type 5: Busbar separation is by metallic or non- metallic rigid barriers or partitions. Terminals may be separated by insulated coverings and glanded in common cabling chamber(s) Type 6: All separation requirements are by metallic or non-metallic rigid barriers or partitions Cables glanded in common cabling chamber(s) Separation of busbars from the functional units and separation of all functional units from one another, including the terminals for external conductors which are and integral part of the functional units Terminals for external conductors not in same compartment as functional unit, but in individual, separate, enclosed protected spaces or compartments Form 4 Type 7: All separation requirements are by metallic or non-metallic rigid barriers or partitions. The termination for each functional unit has its own integral glanding facility. 1) See 7.4.2.1 in relation to protection against contact with live parts. NOTE: Conductors which are connected to a functional unit but which are external to its compartment or enclosed protected space (e.g. control cables connected to a common marshalling compartment) are not considered to form part of the functional unit.

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Transcript of Guide to Internal Separation of ASSEMBLIES

UK National Annex to BS EN 60439-1:1994(reproduced with permission of BSI)

Guide to internal separation of ASSEMBLIES

The internal separation of ASSEMBLIES by barriers or partitions is specified in 7.7, and issubject to agreement between the manufacturer and the user.

Table NC.1 gives additional information regarding different types of construction, based ontypical practice in the United Kingdom. Other types of construction are not precluded, and it isnot essential to adopt any of the listed types in order to comply with the requirements of theBritish Standard. However, in order to achieve agreement between manufactures and users,it is recommended to adopt one of the listed types of construction.

Table NC.1 Forms of separationMain criteria Sub-criteria Form Type of construction

No separation Form 1

Terminals for externalconductors notseparated from busbars

Type 1: busbar separation is achieved byinsulated coverings, e.g. sleeving, wrapping orcoatings 1)

Separation of busbarsfrom the functional units

Terminals for externalconductors separatedfrom busbars

Form 2

Type 2: Busbar separation is by metallic or non-metallic rigid barriers or partitions

Terminals for externalconductors notseparated from busbars

Form 3a

Terminals for externalconductors separatedfrom busbars

Form 3b Type 1: Busbar separation is achieved byinsulated coverings e.g sleeving, wrapping orcoatings1)

Separation of busbarsfrom the functional unitsand separation of allfunctional units fromone another. Separationof the terminals forexternal conductorsfrom the functionalunits, but not from eachother

Type 2: Busbar separation is by metallic or non-metallic rigid barriers or partitions

Type 1: Busbar separation is achieved byinsulated coverings e.g sleeving, wrapping orcoatings. Cables may be glanded elsewhere1)

Type 2: Busbar separation is by metallic or non-metallic rigid barriers or partitions. Cables may beglanded elsewhere

Terminals for externalconductors in samecompartment asassociated functionalunit

Type 3: All separation requirements are bymetallic or non-metallic rigid barriers or partitions.The terminals for each functional unit have theirown integral glanding facility

Type 4: Busbar separation is achieved byinsulated coverings e.g sleeving, wrapping orcoatings. Cables may be glanded elsewhere1)

Type 5: Busbar separation is by metallic or non-metallic rigid barriers or partitions. Terminals maybe separated by insulated coverings and glandedin common cabling chamber(s)

Type 6: All separation requirements are bymetallic or non-metallic rigid barriers or partitionsCables glanded in common cabling chamber(s)

Separation of busbarsfrom the functional unitsand separation of allfunctional units fromone another, includingthe terminals forexternal conductorswhich are and integralpart of the functionalunits

Terminals for externalconductors not in samecompartment asfunctional unit, but inindividual, separate,enclosed protectedspaces or compartments

Form 4

Type 7: All separation requirements are bymetallic or non-metallic rigid barriers or partitions.The termination for each functional unit has itsown integral glanding facility.

1)See 7.4.2.1 in relation to protection against contact with live parts.NOTE: Conductors which are connected to a functional unit but which are external to its compartment or enclosedprotected space (e.g. control cables connected to a common marshalling compartment) are not considered to formpart of the functional unit.