Use your house wiring with a generator when the electric utility power fails

National Electrical Code requires a system in place that prevents an emergency generator from feeding back into the utility line.

A generator interlock will:

• only allow the the generator breaker to be switched on if the main breaker is off
• not allow the main breaker to be turned on unless the generator breaker is off

B-2

Bryant Main Breaker 2 handle Bryant main breaker with the generator breaker vertically adjacent below or above the main breaker

CH-1

Cutler Hammer
1 handle horizontal throw right to left main breaker offset to the left over 2 breaker columns with a 1 1/4" space between main breaker and column breakers

CH-3

Cutler Hammer
1 handle horizontal throw right to left main breaker offset to the right over 2 breaker columns with a 1 1/2" space between main breaker and column breakers

CH-5

Cutler Hammer
1 handle vertical throw main breaker centered over 2 breaker columns with a 2 1/4" space between main breaker and breaker column

CH-7

Cutler Hammer
meter / main combination with 1 handle horizontal throw main breaker centered over 2 breaker columns with a 1 1/4" space between main breaker and breaker columns

CR-1

Challenger/Westinghouse/Thomas & Betts meter / main with 2 handle vertical throw main breaker with a 4 1/2" space between main breaker and a single breaker column

CR-2

Challenger/Westinghouse/Thomas & Betts 200A two handle horizontal throw main breaker offset 7/8" left of center and 1 1/4" above two breaker columns

CR-3

Challenger/Westinghouse 2 handle vertical throw main breaker centered 3 1/2" above two breaker columns

CR-4

Challenger/Westinghouse 2 handle horizontal throw main breaker offset 7/8" left of center and 7/8" to 1" above two breaker columns

CRO-1

Crouse Hinds 2 handle horizontal throw main breaker offset 1/4" right of center and 1/2" above two breaker columns

GE-1

General Electric
4 handle horizontal throw main breaker - offset right of center 5/8"- over 2 breaker columns with a 1 1/4" to 1 5/8" space between main breaker and column breakers

GE-3

General Electric
1 handle vertical throw main breaker centered 2 1/2" above 2 breaker columns

GE-3 LONG

General Electric
1 handle vertical throw main breaker centered 3 1/2" above 2 breaker columns

GE-4

General Electric
4 handle vertical throw main breaker centered over 2 columns with a 2 1/4" space between main breaker and column breakers

GE-7

General Electric
2 handle horizontal throw main breaker - offset right of center 5/8"- over 2 breaker columns with a 1 1/4" to 1 5/8" space between main breaker and column breakers

GE-13

General Electric
4 handle vertical throw main breaker centered beneath 2 breaker columns with a 2 1/4" space between main breaker and column breakers

GE-25

General Electric
1 handle vertical throw main breaker centered 2 1/8" above 2 breaker columns

GEN-1

Murray, Siemens, GE, etc.
most any 2 handle horizontal throw main breaker opposite a 2 handle generator breaker with a 1 1/2" to 1 3/4" space between toggles when one is off and the other is on

GEN-2

Murray, Siemens, GE, etc.
most any 2 handle horizontal throw main breaker adjacent above or below a 2 handle generator breaker

GEN-3

Murray, Siemens, Bryant, etc.
2 handle horizontal throw main breaker with the generator breaker located 2 spaces lower or higher in the opposite column

GS-1

General Switch
100 amp 2 handle horizontal throw main breaker at the top of the left breaker column

ITE-1

ITE - Murray
2 handle vertical throw main breaker centered 1 1/4" above two breaker columns

M-1

Murray - ITE - Siemens
4 handle vertical throw main breaker centered 1 1/4" above 2 breaker columns

M-2

Murray - Crouse Hinds
hump main breaker with horizontal throw on top of the right side breaker column

M-3

Murray - Crouse Hinds
hump main breaker with horizontal throw on top of the left side breaker column

M-4

Murray - Siemens
100 amp 2 handle horizontal throw main breaker at the top of the right column

M-6

Murray - Siemens
200 amp 1 handle horizontal throw main breaker positioned 7/8" left of center and 1 1/4" above 2 columns of breakers

M-7

Murray
200 amp 1 handle horizontal throw main breaker positioned at the top of the right column of breakers

M-8

Arrow Hart Murray
100 amp vertical throw main breaker centered 1/2" over two breaker columns - main is on in the down position

M-8A

Arrow Hart Murray
100 amp vertical throw main breaker centered 1/2" over two breaker columns - main is on in the UP position

M-9

Murray
100 amp 2 handle horizontal throw main breaker centered 1 1/4" over two breaker columns

SD-1

Square D
4 handle horizontal throw main breaker, slightly right of center, over 2 breaker columns with a 2 1/4" to 2 11/16" space between main breaker and column breakers

SD-2

Square D
1 handle horizontal throw left to right main breaker centered over 2 breaker columns with a 1 3/8" space between main breaker and column breakers

SD-3

Square D
1 handle horizontal throw left to right main breaker centered over 2 breaker columns with a 1" space between main breaker and column breakers

SD-4

Square D
1 handle vertical throw main breaker centered over 2 breaker columns with a 3 to 3 1/2 inch space between main breaker and column breakers

SD-5

Square D
100 amp 2 handle horizontal throw main breaker at the top of the right column

SD-9

Square D
QO main breaker with a QO generator breaker adjacent above or below

SI-1

Siemens
4 handle vertical throw main breaker centered over 2 breaker columns with a 2 5/8" space between main breaker and 4 column breakers

TB-1

Thomas & Betts
2 handle horizontal throw main breaker offset 7/8" left of center and 1 3/4" above two breaker columns

TB-2 (same as CR-2)

Thomas & Betts 200A two handle horizontal throw main breaker offset 7/8" left of center and 1 1/4" above two breaker columns

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