Directive of the European Parliament and of the Council of 12 December 2006 laying down technical requirements for inland waterway vessels and repealing Council Directive 82/714/EEC (2006/87/EC) (repealed)

Article 9.06 Maximum permissible voltages

1. The following voltages shall not be exceeded:

a Where that voltage comes from higher-voltage networks galvanic separation shall be used (safety transformer).
b All of the poles of the secondary circuit shall be insulated from the earth.
Type of installation	Maximum permissible voltage
	Direct current	Single-phase alternating current	Three-phase alternating current
a. Power and heating installations including the sockets for general use	250 V	250 V	500 V
b. Lighting, communications, command and information installations including the sockets for general use	250 V	250 V	-
c. Sockets intended to supply portable devices used on open decks or within narrow or damp metal lockers, apart from boilers and tanks:
1. In general	50 Va	50 Va	-
2. Where a protective circuit-separation transformer only supplies one appliance	-	250 Vb	-
3. Where protective-insulation (double insulation) appliances are used	250 V	250 V	-
4. Where ≤ 30 mA default current circuit breakers are used.	-	250 V	500 V
d. Mobile power consumers such as electrical equipment for containers, motors, blowers and mobile pumps which are not normally moved during service and whose conducting parts which are open to physical contact are earthed by means of an earthing conductor that is incorporated into the connecting cable and which, in addition to that earthing conductor, are connected to the hull by their specific positioning or by an additional conductor	250 V	250 V	500 V
e. Sockets intended to supply portable appliances used inside boilers and tanks	50 Va	50 Va	-

2. By way of derogation from paragraph1, if the necessary protective measures are applied higher voltages shall be acceptable:

(a) for power installations where their power so requires;

(b) for special on-board installations such as radio and ignition systems.