Electrical Safety and Installation Standards for Outdoor Lighting
Pictures of Protection, Measurement, and Control
Power lines to the points of light and control, if any, will depart from a pattern of protection and control lines. These will be protected individually with an omnipolar circuit breaker. This picture includes overcurrent (overload and short circuit), earth fault currents, and overvoltage protection, when the equipment is installed as required. The intensity of the defect and the disconnect threshold of switches (which may be automatic reclosing) shall be a maximum of 300 mA. The grounding resistance, measured during the commissioning of the facility, shall be a maximum of 30 Ω. However, switches with a maximum intensity of 500 mA or 1 A are allowed, provided that the grounding resistance as measured during the commissioning of the facility is less than or equal to 5 Ω and 1 Ω, respectively.
If the drive system is done with lighting time switches or photoelectric switches, it will also have a manual switch that allows the operation of the system, regardless of the aforementioned devices.
The envelope of the table must provide a minimum degree of protection of IP55 and IK10 according to UNE 20324 and UNE-EN 50102, respectively. It should have a locking system that allows exclusive access to authorized personnel, with an access door at a height between 0.3 m and 2 m. Action items will be located in a separate module.
The metal parts of the box will be connected to ground.
Luminaires
Features
The lights used in outdoor lighting shall conform to UNE-EN 60598-2-3, and UNE-EN 60598-2-5 in the case of external projectors.
Electrical Installation of Suspended Lights
The connection is done through flexible cables, entering the luminaire with sufficient slack to prevent oscillations that cause harmful efforts on cables and terminal connections. Devices that do not decrease the luminaire’s IPX3 degree of protection (according to UNE 20324) will be used.
The suspension of the luminaires will be protected by steel cables from corrosion, of sufficient size for holding a mechanical strength and a safety factor of not less than 3.5. The minimum height above the ground is 6 m.
Types of Networks
Underground Networks
Systems and materials similar to those of underground distribution networks regulated by ITC-BT-07 will be used. The cables will have the properties listed in UNE 21123 and will go through tubes. Underground pipes should be as indicated in ITC-BT-21, and the degree of mechanical protection as specified in the instruction. They may be concrete encased or not. When concrete encased, the degree of impact resistance will be light, as per UNE-EN 50086-2-4.
The pipes should be buried to a depth of 0.4 m from ground level, measured from the lower bound of the tube. The inside diameter should not be less than 60 mm.
A warning bandage, signaling the existence of public lighting cables, will be placed at a minimum distance of 0.25 m from ground level, above the pipe. (Previously 0.10 m).
In roadway crossings, channelization, in addition to being piped and concrete encased, will have at least one reserve pipe installed.
The minimum cross-sectional area to be used in the cable conductors, including neutral, is 6 mm2. In three-phase four-pole distributions for phase conductors with a cross-section larger than 6 mm2, the neutral section shall be as shown in Table 1 of ITC-BT-07.
Joints and referrals should be made on appropriate terminal boxes, placed into the brackets of the lights, and at a minimum height of 0.3 m above ground level, or in a registerable casket. This ensures the continuity, insulation, and sealing of the driver.
Aerial Networks
Systems and materials suitable for overhead insulated networks described in ITC-BT-06 will be used.
They may be formed by walls or perched on wires stretched on supports. In the latter case, the cables are self-supporting with a neutral guarantor or surety of steel.
The minimum cross-sectional area to be used for all drivers, including the neutral, is 4 mm2. In three-phase four-pole distribution phase conductors with a cross-section above 10 mm2, the neutral section shall be at least half of the phase section. Where they go on the common support of a distribution network, the laying of cables for lighting will be independent.
Control Networks and Aids
Systems and materials similar to those indicated for the supply circuits will be used. The minimum cross-section of the conductors is 2.5 mm2.