Entering a Service Panel from the Rear

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Old 10-02-19, 04:22 PM
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Entering a Service Panel from the Rear

Can someone please explain how to enter surface mount panel from the rear? I have a meter combo unit that i want to mount on the side wall and enter with SE-R from back and need to know how to enter properly from the crawl pace. Panel has concentric knockouts for up to 3"

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Old 10-02-19, 04:28 PM
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Welcome to the forums.

If the panel is currently installed...... you either need to remove the knockout you intend to use or drill a 1/4" hole thru it and thru the sheathing. Locate the 1/4" bit inside and drill a hole from the backside out using a hole saw large enough for the conduit or cable connector. The starter bit will follow the 1/4" hole. Stop drilling when the hole saw hits the panel.
 
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Old 10-02-19, 04:33 PM
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Brand new installation. How would one terminate the SE-R properly? Interior was easy, just used a 2" 2 screw clamp. But just not understanding the rules on NM entering the rear of the panel. Does it have to have/ a clamp, or is a conduit nipple with a bushing all that is needed?

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Old 10-02-19, 04:38 PM
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The cable must be properly restrained. So it sounds like in your case you will need the same connector on the back of the panel. A bushing on the exposed threads of the connector would be a great idea if there were enough threads.
 
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Old 10-02-19, 07:30 PM
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You may not meet the bend radius entering the back of the panel. The box is only 4" deep.
 
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Old 10-03-19, 05:14 AM
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Agree with pcboss. Attempting to bend SER cable inside a wall cavity or power panel to change direction is a challenge if you follow manufacturer's minimum bend radius. You may want to reconsider the SER cable entrance point if this is a problem.
 
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Old 10-03-19, 01:00 PM
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Does bend radius still apply to individual conductors when the jacket is removed in the panel?
 
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Old 10-03-19, 01:03 PM
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The other option I have is a sleeve with a LB, and removing the Jacket at the LB to enter the panel (which the inspector has previously authorized). Just currently considering a different mounting location for the meter combo.

And for further clarification, this is a surface mounted meter combo.
 
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