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Form 4 - Separation of busbars from the functional units.
- Separation of functional units from one another.
- Separation of terminals from the functional units.
Form 4 type 1
- Busbar separation is achieved by insulated coverings: sleeving, wrapping or coatings etc.
| Form 4 type 2
- Busbar separation by metallic or non-metallic rigid barriers or partition.
| Form 4 type 3
- Separation achieved by metallic or non-metallic rigid barriers or partitions.
- Individual glanding at functional unit.
| Form 4 type 4
- Busbar separation is achieved by insulated coverings e.g sleeving, wrapping or coatings
- Terminals separate from the functional unit.
- Insulated terminals by sleeving or wrapping etc.
| Form 4 type 5 
- Busbar separation by metallic or non-metallic rigid barriers or partition.
- Terminals separate from the functional unit.
- Insulated terminals by sleeving or wrapping etc.
| Form 4 type 6 
- All separation is by metallic or non-metallic rigid barriers or partitions.
- Terminals separate from the functional unit.
| Form 4 type 7
- All separation is by metallic or non-metallic rigid barriers or partitions.
- Terminals separate from the functional unit.
- Individual glanding at functional unit.
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