Connection examples for overvoltage arresters, Electrical connection, Vessel without cathodic corrosion protection – VEGA VEGASWING 83 fail safe and signal conditioning instrument VEGATOR 526 Ex User Manual
Page 20: Cu-line
20
VEGASWING 81 W5 Ex.C, 83 W5 Ex.C fail safe
Electrical connection
E2
E1
A2
A1
A1
A2
E2
E1
1
2
Typ
B62-27
Typ
B62-27G
d30
d32
E86 Ex
Connection examples for overvoltage arresters
Vessel without cathodic corrosion protection
t
o potential
equalisation
line
min. 4 mm
2
Cu
External
earth terminal
optionally
overvoltage arrester
Note :
- Use suitable cable, optionally with metal cover or screen. Cable with metal cover or screen
(as shown) do not require a potential equalization along the complete intrinsically safe circuit.
Just connect the screen or metal cover to the overvoltage arrester (test voltage
≥
␣ 500␣ V).
- The 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
Metal housing isolated
mounted or plastic
housing
Overvoltage arrester
type B62 - 27 Ex 0
or B62 - 27 Ex
Overvoltage
arrester
Line length
≤
␣ 50 m
VEGASWING
VEGATOR
526 Ex
Ex-area
Not Ex-area
(control room)