ERICO IBS, IBSB Selection Guide
How to select nVent Eriex IBS & IBSB Advanced?
When sizing a conductor, the air temperature around the
conductor is a very important parameter, mainly affected by
factors such as convection type, protection level of enclosure
or the temperature rise. Based on IEC 61439 standards, the
ambient air temperature does not exceed +40°C and its
average over a period of 24h does not exceed +35°C.
For IBS & IBSB Advanced, we provided an ampacity
table under different temperature rise, a lower temperature rise
maybe used when the ambient temperature is higher than usual.
TEMPERATURE RISE OF THE CONDUCTOR.
Temperature rise of the conductor (ΔT) = Temperature of the
conductor – Internal temperature of the panel.
• Temperature rise of conductor = T2 – T1 = ΔT (C°
Example:
For a requested current of 630A, with: T1 = 40ºC and T2 = 90ºC
• ΔT = 90 – 40 = 50°C
• in the ΔT 50ºC column, find the closest current value
to 630A.
Result: IBSB Advanced 240 mm² – 718A (IEC & UL).
)
For IBS & IBSB Advanced, we recommend the maximum
temperature rise does not exceed 50°C for a normal
application. Generally, 50°C is chosen as the default
temperature rise considering the ambient temperature
inside the panel is below 40°C. But when the connected
section is an electrical component which may dissipate
heat (for example circuit breaker) or the ventilation inside
the enclosure is not efficient, it may be necessary to choose
lower temperature rise.
Internal
Temperature of
Panel (T1)
Temperature of
Conductors (T2)
Ambient
Temperature
Insulated
Braided
conductor type
IBSB ADV 25 25 (49.34
IBS ADV 25 25 (49.34
IBS ADV 50
IBSB ADV 50
IBSB ADV 70 70 (13 8 .15
IBSB ADV 100 100 (19 7. 3 5
IBSB ADV 120 120 (236.82
IBSB ADV 185 185 (365.1
IBSB ADV 240 240 (473.65
Admissible currents: This table indicates the tempe rature rise produced by chosen current in th e given section. This calculation does not take into ac count the heat dissipation from the
switch gear.
Cross Section
mm² (kcmil
)
)
50 (98.68
)
)
)
Maximum Ampacity Ratings Current Coefficient
ΔT 30°
)
C (A
116 134 142 150 157 16 4 17 7 1.6 2
137 15 8 167 177 185 19 3 209 1.6 2
213 246 260 274 288 301 325 1.6 2
226 261 277 291 306 319 345 1.6 2
)
298 344 365 385 404 422 456 1.6 2
)
363 419 444 468 491 513 554 1.6 2
416 480 509 537 563 588 635 1.6 2
)
556 642 681 718 753 786 849 1.6 2
ΔT 40°
)
C (A
ΔT 45°
)
C (A
ΔT 50°
)
C (A
ΔT 55°
)
C (A
ΔT 60°
)
C (A
ΔT 70°
)
C (A
)
IBS & IBSB ADVANCED IN PARALLEL
When using 2 or 3 IBS & IBSB Advanced in parallel for the
same phase, use the current coefficient showed on the next
IEC & UL ampacities table.
Example:
IBSB Advanced 240 mm² – ΔT = 50°C: 718 A (IEC & UL
• 2 Braids in parallel: 718 A x 1,6 = 1149 A
• 3 Braids in parallel: 718 A x 2 = 1436 A
)
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