ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka stáhnout pdf (Strana 186)

lets is 15m. The maximum cable length between the circuit breaker panel and the farthest

point (luminous point or outlet) generally is 50m.

It is important to limit the voltage drop in the electrical cables to 2% to keep an

acceptable voltage for the electrical devices connected to the installation network.

The following formula is used to determine the corresponding single-phase cable

length:

=× × ×Δ

100

2ρ

(length expressed in meters)

where

is the voltage drop as a percentage.

is the voltage of the electrical network (110V or 230V).

is the resistiveness of the electrical wiring (0.023 for copper and 0.037 for alumi-

num).

S is the cable section in mm².

I is the strength of the current flowing through the cable, expressed in A.

For a copper single-phase cable with a voltage drop of 2%, this formula becomes:

=×100

For a cable supplying luminous points with a 1.5-mm² section and a maximum per-

mitted current of 16A, it is recommended to have a cable length of 9.3m. For a cable sup-

plying outlets with a 2.5-mm section and maximum permitted current of 20A, it is

recommended to have a cable length of 12.5m.

Choosing the Topology for a PLC Network

The PLC local area network must adapt to the electrical network of the building.

Each building can have various types of cables, various circuit breaker panels, vari-

ous circuit breakers, various cut-out switches (fuses, circuit breakers), and also cir-

cuit components connected in series (outlets connected in series to the electrical

wiring) or in parallel (outlets directly connected to cables from the circuit breaker

panel).

In the same manner as a Wi-Fi network must adapt to the structure of the walls

of a building, which act as many obstacles to the propagation of radio waves, a PLC

network must adapt to the electrical network and to raceways, which act as obsta-

cles to the propagation of the PLC signal.

The topology of the PLC local area network must adapt to that of the electrical

network in one or several of the following ways:

•

Insofar as possible, determine the topology of the electrical network, for

example by recovering the network diagram or by performing PLC tests on

the various outlets of the building.

•

Find the best points for the connection of PLC devices to the electrical net-

work in order to achieve the best possible PLC coverage. The circuit breaker

panel is a central point for the electrical network since all the electrical wirings

originate from it.

Topology of Electrical Networks 167

1 2 ... 181 182 183 184 185 186 187 188 189 190 191 ... 348 349

Komentáře k této Příručce

Žádné komentáře

ZyXEL Communications PLA-470 V2 - V3.0.5 Instalační příručka Strana 186

Komentáře k této Příručce