Test Procedures
9
30 | nVent.com
The approximate location of the bus wire short,
expressed as a percentage of the heating cable length
from the front end, is:
Fault location: D = A x 100
(A + B)
Example:
A = 1.2 ohms
B = 1.8 ohms
Fault location: D = 1.2 / (1.2 + 1.8) x 100
= 40%
The fault is located 40% along the circuit as
measured from the front end (A).
b.) To locate low resistance ground fault:
To locate a low resistance ground fault,
measure
resistance between bus and braid.
A
B
A
B
A
B
Braid
The approximate location of the fault, expressed as a
percentage of the heating cable length from the front
end (A), is:
Fault location: D = A x 100
(A + B)
Example:
A = 0.6 ohms
B = 0.9 ohms
Fault location: D = 0.6 / (0.6 + 0.9) x 100
= 40%
The fault is located 40% along the circuit as measured
from the front end (A).
