National Instruments CFP-RLY-421 User Manual download pdf (Page 10)

cFP-RLY-421 10 ni.com

•Do not share the external supply voltages (the V and C

terminals) with other devices (including other FieldPoint

devices), unless those devices are isolated from human contact.

• You must connect the protective earth (PE) ground terminal on

the cFP-BP-x backplane to the system safety ground. The

backplane PE ground terminal has the following symbol

stamped beside it: . Connect the backplane PE ground

terminal to the system safety ground using 14 AWG (1.6 mm)

wire with a ring lug. Use the 5/16 in. panhead screw shipped

with the backplane to secure the ring lug to the backplane PE

ground terminal.

• As with any hazardous voltage wiring, make sure that all

wiring and connections meet applicable electrical codes and

commonsense practices. Mount backplanes in an area,

position, or cabinet that prevents accidental or unauthorized

access to wiring that carries hazardous voltages.

• The isolation of the cFP-RLY-421 is certified as

double-insulated for working voltages of 250 V

rms

. Do not use

the cFP-RLY-421 as the only isolating barrier between human

contact and working voltages of more than 250 V

rms

• Operate the cFP-RLY-421 only at or below Pollution Degree 2.

Pollution Degree 2 means that only nonconductive pollution

occurs in most cases. Occasionally, however, a temporary

conductivity caused by condensation must be expected.

•Do not operate FieldPoint products in an explosive atmosphere

or where there may be flammable gases or fumes. If you need

to operate FieldPoint products in such an environment, the

FieldPoint products must be in a suitably rated enclosure.

• Operate the cFP-RLY-421 at or below Installation Category II.

Installation Category II is for measurements performed on

circuits directly connected to the low-voltage installation.

This category refers to local-level distribution, such as that

provided by a standard wall outlet.

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National Instruments CFP-RLY-421 User Manual Page 10