Connection; A - Protection; B - Power Circuit - LEGRAND DPX3 250 Installation Manual

A – PROTECTION
Capacitor banks not equipped as standard with a general protection system must always be
fitted with one. It should be installed at the start of the power supply cable with:

A circuit breaker:

A gG type HPC switch-fuse, with a rating of 1.4 x In minimum
B – POWER CIRCUIT
The recommendations below must be followed when connecting capacitor banks to the main
power supply:

The power cables used for connection must have minimum dimensions of:

The cross-section calculation must take account of the usual coefficients associated with
the cable type:

Phases L1/L2/L3 must be connected as marked on the internal busbar.

For enclosures made up of several cubicles, the busbar in each cubicle MUST be
connected to the upstream power supply via power cables of the same quantities
and cross-sections in order to ensure balanced distribution of the currents

The capacitor bank must be earthed with a cable whose cross-section complies with the
current standard.
(1)
To help you choose, you can consult the table on page 36.
(2)
See the table of recommended cross-sections for the power supply cables on page 36.
(3)
Except on versions with built-in general protection system.
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3 – CONNECTION
o with a thermal relay
o with a magnetic relay
 I = 1.43 x In
o
Type
o
Length
o
Installation method
(1)
set to 1.4 x In minimum
(1)
set to between 8 and 10 x In
(2)
35
(1)(3)
.