VEGA VEGATROL 20 Ex - Manual (Page 15)

VEGATROL 20 Ex 15
1
E2
E2
E1
E1
A2
A2
A1
A1
A1
A2
A2
A1
E2
E2
E1
E1
2
1
2
Typ
B62-27
Typ
B62-27
Typ
B62-27G
Typ
B62-27G
2 Technical Information
2.8 Connection examples for overvoltage arresters
Vessel without cathodic tank protection
to potential
equalization line
min. 4 mm 2 Cu
External earth terminal
either
overvoltage arrester
d30
d32
Note:
- Suitable cable must be used, either with metal cover (or screen). If a
cable with metal cover or screen is used (as on above figure), a potential
equalization along the entire length of the intrinsically safe circuit is not
necessary. Screen or metal cover must only be connected to the
overvoltage arrester.
- The current load capacity of the screen must correspond at least to that
of a 1,5 mm 2 Cu-line.
Earth- / PA-
connection terminal
Outer isolation Outer isolation
Screen
Screen
Ex-area Not Ex-area
(control room)
1
E2
E2
E1
E1
A2
A2
A1
A1
A1
A2
A2
A1
E2
E2
E1
E1
2
1
2
Typ
B62-27
Typ
B62-27
Typ
B62-27G
Typ
B62-27G
Overvoltage arrester
min. 4 mm 2 Cu
Screen
VEGATROL 20
System sensor
either
overvoltage arrester
d30
d32
Note:
- Suitable cable must be used with metal cover (or screen). Screen or
metal cover must only be connected to the overvoltage arrester.
Screen or metal cover must not be earthed.
- The cable must have an outer isolation.
- The current load capacity of the screen must correspond at least to that
of a 1,5 mm 2 Cu-line.
Earth- / PA
connection terminal
Outer isolation
Ex-area Not Ex-area
(control room)
Vessel with cathodic tank protection
Screen
Line length
≤ 50 m
Overvoltage arrester
Type B 62 - 27 Ex 0-2
or B 62 - 27 Ex-2
Overvoltage arrester
VEGATROL 20
System sensor
117/4 A Ex
or
115 A Ex
E86 Ex
Line length
≤
50 m
Overvoltage arrester
Type B 62 - 27 Ex 0 - 2
or B 62 - 27 Ex - 2
VEGATOR
526 W Ex
VEGATOR
526 W Ex
117/4 A Ex
or
115 A Ex
E86 Ex
Outer isolation
External earth
terminal
Cathodic tank protection
2 … 24 V
(object voltage)
intrinsically safe
circuit to signal
conditioning
instrument
intrinsically safe
circuit to signal
conditioning
instrument
Metal housing isolated or
plastic housing
Metal housing isolated or
plastic housing