Technical information

1.3.5 Overcurrent Protection

1492-SP 140F

The choice of overcurrent protection depends first and foremost on how the

control circuit is powered:

1) Downline from a pre-existing BCP (Branch Circuit Protection).

2) Directly from the general distribution inside the panel by installing a special

branch circuit protection;

The above mentioned circuits will be called Control downline of a BCP

(shown in blue) and Control Circuit derived directly from the feeder

(shown in red), respectively

1) Control Circuit down line of a BCP

The control circuit is derived down line from a branch circuit protection that

already exists (UL 489 fuses or circuit breaker,in this example the BCPs are

motor start fuses).

The BCP guarantees protection from short circuit of the feeder circuit;

the contr

ol circuit begins at the point where the r elative conductors are

derived. All the overcurrent protections down line are part of the control

CONTROL CIRCUITS

YES

1492-SP UL1077

1492-CB UL1077 – UL508

UL 1077 and UL 508

prohibits use directly

connected in feeder circuits