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Forms of internal separation and associated types of construction
are illustrated below and are for guidance only.
We have made available the BS EN 60439-1:1994 Guide to internal
separation of ASSEMBLIES (UK Annex) in pdf format. You may download
it here.
>> Suggested Layouts and Compartment Sizes. Download
it here (64KB).
Forms of separation / Types of construction
The forms of internal separation and the associated types of construction
are shown in the following illustrations. The diagrams are simple
schematics intended solely to illustrate the principals involved.
They are not intended to represent or determine in any way the actual
physical layouts of assemblies.
More detailed representations can be found in the standard itself.
Key to symbols
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Busbars
Functional unit(s) including terminals for associated external
conductors
|
| Enclosure |
Internal
separation |
Cable gland
|
|
No internal separation
Separation of busbars from the functional units
 |
Terminals for external conductors
NOT separated from busbars |
 |
 |
Typical variants
Type 1: Busbar separation is achieved by insulated coverings
e.g sleeving, wrapping or coatings
Type 2: Busbar separation is by metallic or non-metallic
rigid barriers or partitions
|
Terminals for external conductors
separated from busbars |
|
|
Separation of busbars from the functional units
plus Separation of functional units from one another
plus Separation of terminals from the functional units but not from
each other
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Terminals for external conductors
NOT separated from busbars |
Separation of busbars from the functional units
plus Separation of functional units from one another
plus Separation of terminals from the functional units but not from
each other
|
|
Typical Variants
Type 1: Busbar separation is achieved by insulated coverings
e.g sleeving, wrapping or coatings
Type 2: Busbar separation is by metallic or non-metallic
rigid barriers or partitions
|
Terminals for external conductors
separated from busbars |
|
|
Separation of busbars from the functional units
plus Separation of functional units from one another
plus Separation of terminals from the functional units
 |
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Typical Variants
Type 1: Busbar separation is achieved by insulated coverings
e.g sleeving, wrapping or coatings
Type 2: Busbar separation is by metallic or non-metallic
rigid barriers or partitions. Cables glanded elsewhere.
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Terminals for external conductors
in same compartment as functional unit |
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|
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Typical Variants
Type 3: All separation by metallic or non-metallic rigid
barriers or partitions.
The terminals for each functional unit have their own integral
glanding facility.
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Terminals for external conductors
in same compartment as functional unit |
|
|
 |
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Typical Variants
Type 4: Busbar separation is achieved by insulated coverings
e.g sleeving, wrapping or coatings
Type 5: Busbar separation is by metallic or non-metallic
rigid barriers or partitions. Terminals separated by insulated
coverings. Cables glanded in common cabling chamber.
Type 6: All separation is by metallic or non-metallic rigid
barriers or partitions. Cables glanded in common cabling chamber.
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| Terminals NOT in same compartment as functional unit |
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|
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Typical Variants
Type 7: All separation by metallic or non-metallic rigid
barriers or partitions. The terminals for each functional
unit have their own integral glanding facility.
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| Terminals NOT in same compartment as functional unit |
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The above illustrations are extracts from BS EN 60439-1:1999 IEC
60439-1:1999 and have been reproduced by kind permission of BSI.
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