HI 6020IT and HI 6020JB User Guide
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Chapter 3
Installation of Intrinsically Safe HI 6020 IT and HI
6020JB Summing Boxes into Hazardous (Classified)
Locations
• • • • • •
This user guide is intended to provide the user with an overview regarding the proper selection of electronic
weighing systems used in hazardous locations. This document does not provide details on the installation of
equipment as this is typically the responsibility of the installing electrician and/ or engineering design firm.
For the latest information please refer to the appropriate set of control drawings which will be one of the item
shipped with the summing box.
•
HI 6020JB series please refer to
control drawing 0594-0007
•
HI 6020IT series please refer to
control drawing 0594-0008
Additional copies this user guide and control drawings are available on the Hardy website at:
Wiring Summing Boxes
IMPORTANT NOTES when wiring between load cells, summing boxes, and intrinsically safe barriers
1.
Associated apparatus manufacturer’s installation drawing must be followed when installing this equipment.
2.
Resistance between Intrinsically Safe Ground and earth ground must be less than 1.0 Ohm.
3.
Install Intrinsic Safe Barriers in accordance with barrier instructions.
4.
The total combined length of all wiring in the system, including the cable from each associated apparatus to and from
the summing box, and to each load cell must not exceed 300 feet.
a.
Installation should be in accordance with any applicable local electrical code, which may include ANSI/ISA
RP12.06.01 “Installation of Intrinsically Safe System for Hazardous (Classified) Locations,” the electrical Safety
code (ANSI/NFPA 70) Article 504.
b.
The products for use in both Class I, II, III Division 1 and 2 areas (NEC 501, 502) and Class 1, Zone 0 and 2,
Group IIC, and Zone 20 and 22, Group IIIC areas (NEC 505, 506) is the HI 6020JB-SSX-Y and the HI 6020IT-
SSX-Y (both shipped with cable glands):
c.
SS = Stainless Steel enclosure
d.
1 = Without trim pots, 2 = With Trim Pots
e.
Y= blank is a 5-hole summing box enclosure, and Y=6 is a 6-hole summing box enclosure enabling connection
to a second summing box
5.
SB (summing box) maximum cable length 250 ft; used between the summing box and IS barriers.
6.
Substitution of components may impair Intrinsic Safety and/or void Hazardous Area Approval.
