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Guidelines for the use of PVC cable ducts, in accordance with the Electrical Code for Low Voltage Equipment.

The authority to install plastic ducts, as well as the conditions that must be met in the process of this laying, are stipulated in the Decree of the General Directorate of Industrial Innovation and Technology of January 18, 1988 (Official Government Gazette, No. 43 of February 19, 1988). This regulation will remain in force until the adoption and signing of the revised regulation for the installation of low voltage cables.

This regulation applies to PVC cable ducts, as a result of which their application is specified in the following cases:

type of instalation	Channel type
type of instalation	Cable channels (*)	Channels - moldings (*)
Distribution lines MI BT 013	Not accepted (Note 2, Note 3)	Not accepted
Individual bends MI BT 014	Not accepted (Note 3, Note 4)	Not accepted
Internal wiring MI BT 018	Accepted	Accepted
Accommodation MI BT 021	Accepted	Accepted
Crowded places MI BT 025	Accepted	Accepted (Nota 5)
Special premises MI BT 027:
A) Rooms with damp conditions	Accepted (Note 6)	Not accepted
B) Rooms with high humidity conditions	Accepted (Note 7)	Not accepted
C) Service stations, garages and workshops for fixing mechanisms	Accepted despite dangerous dimensions (Note 8)	Not accepted

REMARKS:
Note 1
For both eaves and conventional trunking, it is allowed to use insulated wires with a waterproof coating with a minimum value of H05, as well as insulated wires without coating with a minimum value of H07. 400/750 V).
In the case of using an insulated uncoated wire (minimum value H07), when two or more electric circuits are connected during planning, these circuits can be laid in cable ducts at the same time, if the conditions specified in section 4.1 of MI BT 018 are met

. Note 2.
The area of the channel (cable channel / duct) must allow an increase in the area for wires by 100%.

Note 3.
Adequate measures must be taken to avoid improper handling, for example, sealing, or other method specified in the current regulation.

Note 4.
The area of the duct (cable duct / duct) should allow an increase in the area under the wires by 50%. When planning involves connecting two or more separate circuits, the individual circuits can be routed in the duct at the same time using insulated wires with a waterproof coating, thus ensuring the necessary separation.

Note 5.
In accessible areas, channels (cable ducts and trunks) should be placed in such a way as to exclude people from accessing them.

Note 6.
The ducts (cable ducts) can only be installed in this type of room using insulated wire with a waterproof coating with a minimum value of H05. For terminals and connectors, systems or devices with an appropriate level of protection against water ingress (IP X1) must be used.

Note 7.
Cable ducts can be installed in this type of premises only using insulated wire with a waterproof coating with a minimum value of H05. For terminals and connectors, systems or devices with an appropriate level of protection against water ingress (IP X4) must be used.

Note 8. The
cable ducts must be IP-XX (7).

Note 9.
When installing cable channels, it is allowed:
- Connect and fasten wires inside the duct
- Place mechanisms such as switches, plugs, control and monitoring panels inside the duct if they are securely attached to the base or duct cover.

Note 10.
When installing the channel in special rooms, it is recommended to provide for an increase in its capacity indicator by 30%.

The conditions for using cornice channels are listed in section 5.4. See instructions MI BT 018.