Atlas Copco QAS 14, Инструкция по эксплуатации

Страница: 37 / 100

- 37 -
Quality, minimum section and
maximum length of cables
The cable connected to the terminal board of the
generator must be selected in accordance with local
legislation. The type of cable, its rated voltage and
current carrying capacity are determined by
installation conditions, stress and ambient
temperature. For flexible wiring, rubber-sheathed,
flexible core conductors of the type H07 RN-F
(Cenelec HD.22) or better must be used.
The following table indicates the maximum allowable
3-phase currents (in A), in an ambient temperature of
40°C, for cable types (multiple and single core PVC
insulated conductors and H07 RN-F multiple core
conductors) and wire sections as listed, in accordance
with VDE 0298 installation method C3. Local
regulations remain applicable if they are stricter than
those proposed below.
The lowest acceptable wire section and the
corresponding maximum cable or conductor length
for multiple core cable or H07 RN-F, at rated current
(20 A), for a voltage drop e lower than 5% and at a
power factor of 0.80, are respectively 2.5 mm² and
144 m. In case electric motors must be started,
oversizing the cable is advisable.
The voltage drop across a cable can be determined as
follows:
e = Voltage drop (V)
I = Rated current (A)
L = Length of conductors (m)
R = Resistance (

/km to VDE 0102)
X = Reactance (

/km to VDE 0102)
Connecting the load
Site distribution panel
If outlet sockets are provided, they must be mounted
on a site distribution panel supplied from the terminal
board of the generator and in compliance with local
regulations for power installations on building sites.
Protection
– Check whether frequency, voltage and current
comply with the ratings of the generator.
– Provide for the load cable, without excessive
length, and lay it out in a safe way without
forming coils.
– Open the door of the control and indicator panel
and the transparent door in front of the terminal
board X1.
– Provide the wire ends with cable lugs suited for
the cable terminals.
– Loosen the cable clamp and push the wire ends of
the load cable through the orifice and clamp.
– Connect the wires to the proper terminals (L1, L2,
L3, N and PE) of X1 and tighten the bolts
securely.
– Tighten the cable clamp.
– Close the transparent door in front of X1.
Wire section Max. current (A)
(mm
²
)
Multiple core Single core H07 RN-F
2.5 22 25 21
4 30 33 28
6 38 42 36
10 53 57 50
16 71 76 67
25 94 101 88
35 114 123 110
50 138 155 138
70 176 191 170
95 212 228 205
e
3 I L R

cos

X

sin

+
    
1000
------------------------------------------------------------------------------
=
For safety reasons, it is necessary to
provide an isolating switch or circuit
breaker in each load circuit. Local
legislation may impose the use of
isolating devices which can be locked.
!