Measurement Category I is for measurements performed on circuits not directly connected to
the electrical distribution system referred to as
MAINS
voltage. MAINS is a hazardous live
electrical supply system that powers equipment. This category is for measurements of voltages
from specially protected secondary circuits. Such voltage measurements include signal levels,
special equipment, limited-energy parts of equipment, circuits powered by regulated low-
voltage sources, and electronics.
Caution
Do not connect the NI 9157/9159 to signals or use for measurements
within Measurement Categories II, III, or IV.
Note
Measurement Categories CAT I and CAT O are equivalent. These test and
measurement circuits are not intended for direct connection to the MAINS building
installations of Measurement Categories CAT II, CAT III, or CAT IV.
Hazardous Locations
U.S. (UL)
Class I, Division 2, Groups A, B, C, D, T4;
Class I, Zone 2, AEx nA IIC T4
Canada (C-UL)
Class I, Division 2, Groups A, B, C, D, T4;
Class I, Zone 2, Ex nA IIC T4
Europe (ATEX) and International (IECEx)
Ex nA IIC T4 Gc
Safety and Hazardous Locations Standards
This product is designed to meet the requirements of the following electrical equipment safety
standards for measurement, control, and laboratory use:
•
IEC 61010-1, EN 61010-1
•
UL 61010-1, CSA 61010-1
•
EN 60079-0:2012, EN 60079-15:2010
•
IEC 60079-0: Ed 6, IEC 60079-15; Ed 4
•
UL 60079-0; Ed 5, UL 60079-15; Ed 3
•
CSA 60079-0:2011, CSA 60079-15:2012
Note
For UL and other safety certifications, refer to the product label or the
section.
Electromagnetic Compatibility
This product meets the requirements of the following EMC standards for electrical equipment
for measurement, control, and laboratory use:
•
EN 61326 (IEC 61326): Class A emissions; Industrial immunity
•
EN 55011 (CISPR 11): Group 1, Class A emissions
•
AS/NZS CISPR 11: Group 1, Class A emissions
NI 9157/9159 User Manual and Specifications
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© National Instruments
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