Protection Against Direct Contact; Protection Against Indirect Contact; Warning And Note Signs; Location Of The Safety Labels - Baxi Solargen PHOTOVOLTAIC Manual

Table 7. Maximum earth resistance

Earth resistance (Ω)
R ≤ 100
PV Array d.c. Junction Box.
Danger - contains live parts
during daylight.
Do not disconnect d.c. plugs
and sockets under load-
turn off a.c. supply first.
PV array d.c. isolator.
Danger - contains live parts
during daylight.
Inverter - Isolate a.c.
and d.c. before carrying
out work.
PV system-main a.c.
isolator.
WARNING
Isolate on-site generator at
dual supply
Isolate mains supply at

Figure 29. Safety Labels

Figure 30. Warning Sign – Injury or death risk
20
Solargen solar PV
IΔn (mA)
300
Label 1
Label 2
Label 3
Label 4
Label 5
Do not work on this equipment
until it is isolated from both mains
and on-site generation supplies
4. PV SYSTEM PROTECTION
4.2.

Protection against direct contact

The protection against direct contacts should be carried out by one or
more of the following processes:
• Active part insulation
• Use of barriers or enclosures
• Use of low voltage security
• Use of reduced voltage protection
The active parts must necessarily be isolated by the use of equipment
that is in accordance with regulations in force and its proper implementa-
tion in the installation.
The conductor extremities should be always well isolated, to ensure a
protection higher than IP2X
4.3.

Protection against indirect contact

The protection against indirect contacts is based on the automatic cutting
of the power, using a residual current device (RCD) connected to an ap-
propriate protective earth system.
4.4.

Warning and note signs

All labels must be clear, easily visible, constructed and affixed to last and
remain legible for the lifetime of the system.
Dual supply labeling should be provided at the service termination, meter
position and all points of Isolation to indicate the presence of on site ge-
neration and indicating the position of the main a.c. switch disconnector.
Requirements for labeling are contained within the relevant sections of
this guide. The labels provided in the PV kit can be seen at Figure 29
and 30.
4.4.1.

Location of the safety labels

The PV installations should be labeled in the following way:
Label 1 – Array Junction Box
Label 2 – DC plugs and socket connectors - must be fixed next to con-
nectors, except those that are inaccessible to anyone except trained per-
sonnel in the course of PV maintenance or fault finding.
Label 3 – DC Switch
Label 4 – Inverter
Label 5 – Main AC isolator
Label 6 – Dual supply label to be applied to the service termination, meter
position and all points of isolation to indicate the presence of on site ge-
neration and the position of the main a.c.switch disconnector.
(See in the figure 24, figure 25, figure 26 the end location safety labels)
Label 6
(Table 7)