Flameproof motors | 33
www.weg.net
For motors with increased safety terminal box,
voltage and tolerances are limited by IEC/EN
60079-7 standard that imposes a maximum
allowed voltage of 10kV + 10%.
5.2.2. CONNECTIONS
ATTENTION
Analize the electrical connection
diagram supplied with the motor
carefully
before
beginning
the
connection of the power, grounding
and accessory cables.
Open the terminal box and check pertinent details,
if required. Check if the rated voltage is the same
as that given on the motor nameplate. Specify
connection cables to meet motor rated current
taking into consideration environment factors (such
as ambient temperature, installation type, etc).
Supply cables must be selected for an ambient
temperature of 80ºC or above if indicated on a
motor nameplate.
Make sure the cross section and insulation of
connection cables are suitable for the motor current
and voltage.
As standard, W22Xd motors are prepared in
accordance with:
LOW VOLTAGE: < 1,1kV
Table 5-6 - Terminal box entry holes and cables cross
section (Low voltage)
Terminal boxes with protection Ex d or Ex e
Current
No. of entrance
holes/Dimension
Máx. cables
cross section
(1)
I ≤ 900A
2 x M63 x 1.5
300 mm
2
900 < I ≤ 1900A
4 x M63 x 1.5
300 mm
2
(1)
Armoured cable, XAV, Copper, etc.
MEDIUM VOLTAGE: 1,1 < Un < 6,6kV
Table 5-7 - Terminal box entry holes and cables cross
section (Medium voltage)
Terminal boxes with protection Ex d or Ex e
Current
No. of entry
holes/Dimension
Máx. cables
cross section
(1))
≤ 315A
1 / M63x1.5
120 mm
2
315 < I ≤ 400A
3 / M63x1.5
500 mm
2
400
< I ≤ 630A
3 / M63x1.5
630
< I ≤ 800A
6 / M63x1.5
630
< I ≤ 1260A
6 / M63x1.5
(1)
Armoured cable, XAV, Copper, etc.