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Standards
NF C17-200 March 2007 Scope
The purpose of NF C17-200 is to define the conditions under which the installations concerned must be established and maintained to ensure the safety of people, the preservation of property and, when they are
powered by a public distribution network, to avoid any disruption in the overall operation of this network.
The rules apply to outdoor electrical installations:
- Low Voltage (LV) and High Voltage (HVA-SL) outdoor lighting installations
- lighting of private and public roads
- street furniture
- traffic light installations
- kiosks on public roads
- permanent lighting installations in public areas
- lampposts located in covered areas
- CCTV and/or security camera installations powered by outdoor installations
- the different devices or infrastructures powered by outdoor lighting installations or light panel installations
(such as electric vehicle recharging) - signs powered by LV outdoor installations
- permanent socket junction boxes (e.g. markets, events)
- lighting installations using light strings and decorative lights
- pond and dry fire hydrant installations
- These rules are in addition to those of standards NF C13-100, NF C13-200, NF C14-100, NF C14-200,
NF C15-100 and NF 15-150-1 and are associated with UTE technical guides NF C-202, C17-205 and C17-260.
CLASS I EQUIPMENT:
Equipment with main insulation, in which
different accessible conductive parts
are interconnected to an earth terminal.
Requires the use of a protection system
preventing indirect contacts.
CLASS II EQUIPMENT:
Equipment built in such a way as to render
any fault between the energized parts
and accessible parts improbable (double
insulation or reinforced insulation). Provides
its own safety, does not require an earth
terminal and requires no protective system
against indirect contacts.
CLASS III EQUIPMENT:
Electrical equipment where protection is
based on extremely low voltage SELV power
(< 50VAC or < 120VDC) and which are not
generated voltages higher than the upper
limit of Domain I.
Class III equipment must not contain
earthing terminals.
CHOICE OF MATERIALS AND DEGREES OF PROTECTION
- Ambient temperature : from -25°C to +40°C.
- Keraunic level :a parameter relating to
lightning activity. AQ1 (weakly keraunic:
< 25 stormy days/year), or AQ3 (strongly
keraunic: > 25 stormy days/year).This parameter is important for choosing the type of earthing for the installation, and the use of an ADD (Idil) for street lighting
continuity.
- IP protection Index:
protection against contacts, foreign bodies and water. IP34 (outside) and IP57 (above ground level)
minimum.Tolerated inside lampposts as IP21, provided that the lamppost and its inspection hatch are properly maintained;hence the standard recommends the use of at least IP34 protection level.
- IK protection Index:
protection against
mechanical impact. - IK08 min. for electric
junction boxes. - IK10 min. for outdoor boxes and switchgear cabinets.Neutral point arrangements and related protection
PROTECTION AGAINST INDIRECT CONTACT
The grounds of each light source are connected to an earth point. The system is
protected against indirect contact by means of a Residual Current Device (RCD).
NF C17-200 recommends (compulsory in
AQ3: very stormy) conductive lampposts to be earthed with a 25mm bare copper conductor acting both as earth and equipotential link between the different
lampposts.
Otherwise, and outside AQ3 areas, the grounding employs one or more unremovably interconnected earth electrodes (the lamp
posts are linked each other and to the ground terminal by an insulated protective
conductor).
TT systems are protected against indirect currents by one or more RCDs.
Using an Automatic Disconnection Device
(ADD, Idil) for each light source ensures all lampposts remain lit in the event of an earthing fault on one of the lights and
automatic re-arming of the latter in the event of a temporary fault.
On Class I lamps, NF C17-200 recommends the use of an ADD (Idil) in each lamppost; failing this, an RCD can be used, but
without automatic rearming.
- In TN systems:
The grounds of each light source are connected to neutral. The TN-C diagram combines protection and neutral on a single conductor (PEN). The TN-S system has a protective conductor (PE) separate from the neutral. TN systems are protected against fault currents by a circuit-breaker or cut-out. And it is possible, in the TN-S diagram, to use an Automatic Disconnection Device (ADD) at each light source to ensure continuity of lighting.
- Other points:
Cable ducts and sealing/insulation sleeves:
Outside, it is necessary to reconstitute cable-end seals with sealing sleeves.
Inside lampposts, it is recommended to maintain double insulation as far as the inside of the Class II junction box and to
reconstitute cable-end seals with sealing sleeves.
Street furniture and aedicules:
Must be protected by a Residual Current Device (RCD-30mA) integrated into the equipment.