IDEC CORPORATION
2-6-64, Nishimiyahara, Yodogawa-ku, Osaka
532-0004, Japanwww.idec.com

Installation Manual

Certificate No. E234997
Draw. No. B-2270-7 (0)Installations of IDEC Intrinsically Safe System
Rev. F, NOV. 17, 2022
Type EB3C-N-2 Relay Barrier
When installing an IDEC Type EB3C-N-2 Relay Barrier, make sure it conforms to the following drawings and descriptions as well as all
applicable requirements. ANSI/NFPA70.
・ This associated apparatus may also be connected to simple apparatus as defined in Article 504.2 and installed and temperature classified inaccordance with Article 504.10(B) of the National Electrical Code (ANSI/NFPA 70), or other local codes, as applicable.
･ Capacitance and inductance of the field wiring from the intrinsically safe equipment to the associated apparatus shall be calculated and must
be included in the system calculations. Cable capacitance, Ccable, plus intrinsically safe equipment capacitance, Ci must be less than the marked capacitance, Ca(or Co), shown on any associated apparatus used. The same applies for inductance (Lcable, Li and La or Lo, respectively). Where the cable capacitance and inductance per foot are not known, the following values shall be used: Ccable = 60 pF/ft., Lcable = 0.2 µH/ft.
･ Where multiple circuits extend from the same piece of associated apparatus, they must be installed in separate cables or in one cable having
suitable insulation. Refer to Article 504.30(B) of the National Electrical Code (ANSI/NFPA 70) and Instrument Society of America Recommended Practice
ISA RP12.6 for installing intrinsically safe equipment.
･ Intrinsically safe circuits must be wired and separated in accordance with Article 504.20 of the National Electrical Code (ANSI/NFPA 70) or other local codes, asapplicable.
･ This associated apparatus has not been evaluated for use in combination with another associated apparatus.
･ Control equipment must not use or generate more than 125V rms or 125V dc with respect to earth.

Warning !

Substitution of components or unauthorized repair may impair intrinsic safety of apparatus.
To maintain intrinsic safety, the Signal input terminal (Pn-Nn) may only be connected to intrinsically safe circuits where both thewiring and the connected equipment maintain 500 V isolation to the hazardous area earthing/bonding connections.
AVERTISSEMENT - La substitution de composants peut compromettre la sécurité intrinsèque de l'appareil.
Wiring Example （IS terminals: Pn= + ,Nn= - ）IS apparatus(Note 1)Channel separate wiring (any one channel)
HAZARDOUS (CLASSIFIED) L OCATIONClass I, II and III, Division 1, Groups A, B, C, D, E, F and G
Class I, Zone 0 , [AExiaGa] IIC

Type ofBARRIER(Note 2)

Power Supply and Non-intrinsic safe Apparatus(Control Equipment(Note 3))

UNCLASSIFIED LOCATION

Channel common wiring (Common max. 16 between any Pn(+) terminals and any Nn(-) terminal )Note:To set up common wiring, connect two "N" terminals between adjoining Relay Barriers in parallel.
H A Z A R D OU S (C LA S S IF IE D ) L O C A T ION C l a s s I, II a nd I I I , D i v i s i on 1, G r ou ps A , B , C , D , E , F a nd G
IS apparatus
C l a s s I, Z o n e 0 , [ A E x i a G a ] I I C(Note 1)
Common max. 16

Type ofBARRIER(Note 2)･Rating and Parameters of I.S.

Common max. 16

Common max. 16

Power Supply and Non-intrinsic safe Apparatus(Control Equipment(Note 3))

UNCLASSIFIED LOCATION

Ta= 60C, Um= 125V, Uo=13.2V, Io= 14.2mA, Po= 46.9mW at each channel Pn-Nn Io=227.2mA, Po= 750mW at max 16 channels Pn-NnIo(mA)
Po(mW)

14.2 28.4 42.6 56.8 71.0 85.2 99.4 113.6 127.8 142.0 156.2 170.4 184.6 198.8 213.0 227.2 Combined Note 2 The intrinsic safe
46.9 93.8 140.6 187.5 234.3 281.2 328.1 374.9 421.8 468.6 515.5 562.4 609.2 656.1 702.9 750 Lo(mH) apparatus and wirings
0.67 0.65 0.63 0.61 0.59 0.57 0.55 0.53 0.51 0.49 0.47 0.44 0.42 0.39
1.0
shall be accordance tofollowing formulas; for0.79 0.77 0.76 0.75 0.73 0.72 0.70 0.69 0.67 0.66 0.64 0.62 0.61 0.59 0.57 0.55
0.5Co(μF)
examples,0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.93 0.92 0.91 0.90 0.88 0.87 0.86 0.85 0.840.2
0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94 0.94
0.1
Ui> UoIi> IoNote 1 Added to above table, the next values combined Lo and Co are allowable;
Pi> PoIo(mA)
14.2
28.4
227.2
Ci+Cc < CoLo(mH) 176* 88.0 2.50 1.60 0.84 0.48 0.25 44.0* 22.0 3.50 1.40 0.76 0.45 0.25 0.68* 0.68 0.60 0.42 0.30 0.22 0.15
Li+Lc < Lo
Co(μF) 0.94* 0.47 0.55 0.60 0.70 0.80 0.94 0.94* 0.47 0.48 0.60 0.70 0.80 0.93 0.94* 0.45 0.49 0.60 0.70 0.80 0.94*: Therefore, the values are allowable only at Li<1%Lo or Ci<1%Co of the intrinsic safe apparatus.
Note1.

Use intrinsically safe equipment that is UL or simple apparatus (a device which will neither generate nor store more than 1.5V, 0.1A, 25mW such as switches, thermocouples, LED’s and RTD’s).
2. Install the EB3C-N-2 relay barrier in compliance with the enclosure, mounting, spacing, and segregation requirements of the ultimate application.
3. Make sure that the control equipment connected to the EB3C-N-2 relay barrier does not use or generate more than 125 Vrms or 125Vdc (Um = 125V).
4. Make sure that all bolts, nuts, screws, and other means of fastening, including the unused wiring screws, are fastened in place, properly tightened and secured. Mountthe EB3C-N-2 on a 35mm track or directly on a panel surface using screws.
5. Make the layout and wiring so as to prevent the electromagnetic or electrostatic inductions to the intrinsically safe circuit. For example, separate the intrinsically safe
circuit from the non-intrinsically safe circuit by a minimum space of 50 mm or using a full height metal separator. If color-coding is required for the intrinsic safe
components and terminals, use only cables and terminals with light blue markings.
■ General Specification■ Power consumption
Note : ( ) is shown as not for standard sale product.
Power Supply
100V to 120V AC (50/60Hz)
Number of AC power supply(VA)
DC power supply (W)24V DC Class 2Circuit
at 120V AC(50/60Hz)(MAX)at 26.4V DC (MAX)
Operating Temperature -20 to 60 °C (no freezing)
RTRT
Operating Humidity
45 to 85 RH (no condensing)
01
4.1
3.8
1.1
1.0
Pollution Degree
202
4.7
4.2
1.4
1.2
Altitude
2000m under
03
5.4
4.5
1.7
1.3
Dielectric Strength
Between intrinsically safe circuit and05
6.6
5.2
2.4
1.7
non-intrinsically safe circuit :1526.4V
06
7.2
5.5
2.7
1.8
Between AC power and signal
08
8.3
6.1
3.3
2.2
input:1500V AC
10
9.6
6.7
3.9
2.5
08C
8.3
6.1
3.3
2.2
16C(12.6)
8.65.83.5
16C-C(12.6)
(8.6)
5.8
3.5
R: Relay output
T: Transistor output