Cable Accessories (C7)

ARRESTER SELECTION

Normally Recommended MCOV for Various System Voltages

Hubbell Elbow/Parkingstand Lightning Arrester Selection

System L-L Voltage (kV)

Arrester MCOV (kV)

Impedance Grounded or Ungrounded

Nominal

Maximum Grounded Neutral

Selection of the arrester size is based upon the maximum continuous operating voltage (MCOV) line to-ground that is applied across the arrester in service. For arresters on effectively grounded systems, this is normally the maximum line-to-ground voltage – e.g., 7.65 kV on a 12.47 kV multi-grounded system. For ungrounded or impedance-grounded systems, the MCOV should be at least 90 percent of maximum phase-to-phase voltage. Smaller arresters than shown may be used; contact your Hubbell Power Systems account representative for details.

2.40 4.16 4.80 6.90

2.54 4.37 5.04 7.26

2.55 2.55 5.10 5.10 7.65 7.65 8.40 8.40

2.55 5.10 5.10 7.65

12.00 12.47 13.20 13.80 20.78 22.86 23.00 24.94 27.00 34.50

12.70 13.20 13.97 14.52 22.00 24.20 24.34 26.20 28.00 36.20

12.70 15.30 15.30 15.30 22.00 24.40 24.40

12.70 15.30 15.30 15.30 17.00 22.00

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Protective Characteristics

0.5 µsec 5 kA Max IR-kV

Maximum Discharge Voltage (kV Crest)

Catalog Number

MCOV kV

Rating kV

1.5 kA

3.0 kA

5.0 kA

10 kA

20 kA

2_ _ _LA03 2_ _ _LA06 2_ _ _LA09 2_ _ _LA10 2_ _ _LA12 2_ _ _LA15 2_ _ _LA18 2_ _ _LA21 2_ _ _LA24 2_ _ _LA27 2_ _ _LA30

2.55

3 6 9

12.5 25.0 33.5 36.0 50.0 58.5 67.0 73.0 92.0

9.8

10.3 20.5 28.0 29.5 41.0 48.5 56.0 60.0 76.5 84.0 88.5

11.0 22.0 30.0 31.5 44.0 52.0 60.0 64.0 82.0 90.0 94.5

12.3 24.5 33.0 36.0 49.0 57.5 66.0 73.0 90.5 99.0

14.3 28.5 39.0 41.5 57.0 67.5 78.0 84.0

5.1

19.5 26.8 27.0 39.0 45.5 52.0 55.0 71.5 78.0 81.0

7.65

8.4

10 12 15 18 21 24 27 30

10.2 12.7 15.3 17.0 19.5 22.0 24.4

106.5 117.0 131.5

100.5 108.0

108.0

C7 Page 63 | July 2023