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EN-Rev IM/GN-BM-EU/1.21 Copyright © July 2019. Canadian Solar Inc.
5.2
GROUNDING
· EQUIPMENT GROUNDING: Frameless bifacial double glass
modules (CS3U-MB-FG, CS3K-MB-FG) do not present any
exposed conductive parts, and therefore do not require
to be electrically grounded for compliance to the North
American National Electrical Code (NEC).
· For grounding requirements in North America, a module
with exposed conductive parts is considered to comply
with UL 1703 only when it is electrically grounded in
accordance with both the instructions presented below
and the requirements of the National Electrical Code. Any
grounding means used with Canadian Solar Inc. modules
should be NRTL certified to UL 467 and UL 2703 standards.
Please consult our technical service team for the formal
approval process.
· For grounding requirements in other areas, although the
modules are certified to Safety Class II, we recommend
them to be grounded and that module installation should
comply with all applicable local electrical codes and
regulations. Grounding connections should be installed by
a qualified electrician. Connect module frames together
using adequate grounding cables: we recommend using
4-14 mm² (AWG 6-12) copper wire. Holes provided for
this purpose are identified with a grounding symbol
(IEC61730-1). All conductive connection junctions must be
firmly fixed.
· Do not drill any extra ground holes for convenience this
will void the modules warranty.
· All bolts, nuts, flat washers, lock washers and other
relevant hardware should be made of stainless steel,
unless otherwise specified.
· Canadian Solar Inc. does not provide grounding hardware.
· One grounding method is recommended for Canadian
Solar Inc. standard modules, as described below. For al-
ternative grounding methods, please refer to Annex B
(Alternative Grounding Methods). It is not possible to use
standard grounding methods for certain module ranges.
CORRECT CONNECTION OF PLUG CONNECTORS
· Make sure that all connections are safe and properly
mated. The PV connectors should not be subjected to
stress from the exterior. Connectors should only be used
to connect the circuit. They should never be used to turn
the circuit on and off.
· Connectors are not waterproof when unmated. When ins-
talling modules, connectors should be connected to each
other as soon as possible or appropriate measures should
be taken to avoid moisture and dust penetrating into the
connector (T4 endcaps).
USE OF SUITABLE MATERIALS
· Only use dedicated solar cable and suitable plugs (wiring
should be sheathed in a sunlight-resistant conduit or, if
exposed, should itself be sunlight-resistant) that meet
local fire, building and electrical regulations. Please ensure
that all wiring is in perfect electrical and mechanical
condition.
· Installers may only use single-conductor cable listed and
labeled as USE-2 or PV wire which is 90°C wet rated in
North America, and single conductor cable, 4-16 mm² (5-12
AWG), 90°C wet rated in other areas (i.e. TUV 2PfG1169 or
EN50618 approved), with proper insulation which is able
to withstand the maximum possible system open-circuit
voltage. Only copper conductor material should be used.
Select a suitable conductor gauge to minimize voltage
drop and ensure that the conductor ampacity complies
with local regulations (i.e. NEC 690.8(D)).
CABLE AND CONNECTOR PROTECTION
· Secure the cables to the mounting system using UV-
resistant cable ties. Protect exposed cables from damage
by taking appropriate precautions (e.g. placing them
inside a metallic raceway like EMT conduit). Avoid
exposure to direct sunlight.
· A minimum bending radius of 60mm (2.36 in) is required
when securing the junction box cables to the racking
system.
· Protect exposed connectors from weathering damage by
taking appropriate precautions. Avoid exposure to direct
sunlight.
· Do not place connectors in locations where water could
easily accumulate.
