EV Charger | EVS7GGR.202303.GJW www.syncev.co.uk |
SAFETY INFORMATION
Warning: The supplied BG SyncEV charger is manufactured to be safe
without risk provide they are installed correctly, used, and maintained
in accordance with the manufacturers recommendations and installed
by a competent electrical installer in accordance with national and local
regulations, and legislation applicable at the time of installation,
e.g. BS7671 :2018 amendment 2.
The single phase EV charger should be connected to a 230V/240V
nominal AC supply. The supply should run from a dedicated 40A circuit
breaker. We recommend the use of a Type B curve circuit breakers. The
EV charger features an integral 30mA type-A RCD with 6mA DC leakage
detection and therefore an external RCD is not usually required:
1. For cables without earthed metallic covering installed in walls or
partitions at a depth of less than 50mm and also within walls and
partitions with metal parts, and not protected by steel conduit
or similar then RCD protection is required. This can be achieved
by using the BG IP65 EV protection enclosure (CFEV1A) when
mounted next to the existing consumer unit as it includes a double
pole 40A 30mA Type A RCD device to protect the circuit. This can
be used if the cable has no mechanical protection where it passes
through walls and partitions and if the cable is buried within the
ground before reaching the EV charger. This will be in compliance
with the current BS7671 Amendment 2 Wiring Regulations.
2. If the cable is clipped directly to the surface of a wall and does not
pass through a wall or partition to the EV charger then a standard
B type 40A MCB may be installed into the Consumer unit, however
RCD protection may be required for other reasons such as if it
forms part of a TT system and the earth fault loop impedance
values cannot be met. This will be in compliance with the current
BS7671 Amendment 2 Wiring Regulations.
To conform with BS 7671, on occasions a double pole MCB/RCD or
other means of isolation may be required.
Important note: A DC Leakage fault in the vehicle may “blind” a type
“AC” RCD and render it ineective, never feed any EVSE From an
upstream Type “AC” RCD.
EARTHING REQUIREMENTS
The supplied EV charger features an on-board safety monitoring system
to detect low or high voltage supplies and potential earth-neutral
faults, this in accordance with regulation 722.411.4.1 (iv) of BS7671
2018 (Compliant on single phase supplies only). If such a condition is
encountered the charge cycle is ended or prevented and the EV charger
indicator goes red and eectively becomes a double insulated (class II)
device. The vehicle becomes isolated from incoming supply and poses
no risk to touch. This feature removes the requirement for an earth
electrode where it may be ineective or introduce further risk.
The EV charger may be connected directly to a TN-C-S (PME)
earthing system without any special arrangements. It remains the
responsibility of the installer to conduct a risk assessment of the
immediate area to a range of 10 meters (equipotential zone) to
ensure no other conductive metal xings pose risks (mixture of TT/
TN-S and TN-C-S), this is important where cable length may enable
charging inside or outside of a building/garage where the vehicle
is within touch distance. Where certain conditions dictate an earth
electrode must be used it shall be independent from the distributors
earth system with no direct interconnection (the incoming supply
SWA protective earth should be isolated from the housing and/
or earth electrode). The electrical installer shall install a suitable
electrode complete with termination housing and covers where
appropriate, warning labels should be visible and close to the
unconnected SWA protective earth, e.g. inside the charger.
The earth connection shall be made from the electrode to the
charger via copper conductor earth wire of an appropriate CSA for
the installation. The earth wire shall be installed in conduit where
there is a risk of mechanical damage or UV exposure. Additional
note: BG SyncEV recommend Earth electrode impedance to be
<100 ohms.
SURGE PROTECTION
Guidance on requirements for surge protection devices given In
BS7671: section 443.
The EV charger is protected against transient over voltages (+/-2kV
Line-Earth and +/-1 kV Line-Line as a requirement of EN 61000-6-1 ),
a direct lightning strike carries a current of 30~ 200kA the EV charger’s
internal protection would provide little or no protection in such an
event, likewise nor would an SPD rated less than 30kA. If life support
equipment or business operations could be aected by a lightning strike
central SPD protection is advised if it does not already exist.
The guidance on risk calculation in section 443.5 of BS7671 in most
cases is not possible due to unknown location of any SPD already
tted, length of cables to calculate LP etc, it is therefore recommended
a common sense approach is used on choice of SPD (or if required).
ISOLATION AND SWITCHING FOR SAFETY
AND MAINTENANCE
To ensure the EV charger can be “turned o” to enhance security and
enable maintenance activities, a double pole isolator (or DP RCD or
RCBO) suitably rated must be installed within the customer’s property.
An isolator switch is a mandatory requirement for “new builds”, but
optional for existing dwellings (at customer’s request), the switch should
be mounted between 500mm and 1500mm above nished oor level to
comply with regulations. The switch should be rated at 45 Amps.
All installations must comply to BS7671: 2018.
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Installation requirements
