MECHANICAL INTERLOCK INSTALLATION

For installation of EXD visit saginawcontrol.com or click the link below: https://www.saginawcontrol.com/instman/exd-instman.pdf

Use the EXD bolt pack, part of the bolt packSCE-EXDLK, sold separately as an option for standard EXD enclosures. (SCE-EXDLK-MI is for mirror image enclosures, meaning left side mount.) All of the parts necessary for the installation are included in this bolt pack.

The EXD looks similar to the print below, but may be easier to follow along to the following steps.

Image shows a large grey electrical enclosure with a smaller grey enclosure mounted to its side. A warning triangle symbol [⚠] is present.

Installation Steps

Step 1: Rod Installation

Diagram shows various metal components labeled 1 through 9, representing parts of the mechanical interlock system.

Insert hex rod overhead through the wall of the enclosure into the rod guide and hex rod adapter. Ensure the round rod adapter faces the rear of the enclosure. Install the round rod adapter to the hex rod adapter using the push nut.
Insert the round rod into the top and bottom round rod adapters. Position the hex rod parallel to the top and tighten the set screws to hold the rod in place.

Step 2: Pivot Arm and Stop Plate

The EXD door needs to be in the open position for the next step.

Inside the main enclosure, slide the short hex rod and interlock pivot arm into a hex rod adapter, then tighten the set screws. The pivot arm should be parallel to the front flange when the EXD door is in the open position.
[▶️ Click for video]

For 84" and 90" high enclosures, the adjustable rod will be installed down the main interlock hex rod.

Install and adjust the stop plate so it is against the flange when the EXD enclosure door is open.

When installed on an enclosure with a smaller than 3.5" top flange, the stop plate will be installed inverted. See image below.

Image shows a close-up of the interlock mechanism inside an enclosure, with rods and brackets connected.

Image shows another close-up of the interlock mechanism, focusing on the stop plate and its connection.

Diagram showing a '<3.5" top flange config.' with the stop plate mounted in an inverted position.

This feature prevents the main enclosure door from being closed until the EXD enclosure door is first closed.

Step 3: MDV Kit Components

This feature is achieved by a mechanical device called an MDV that is installed on the inside of the enclosure flange.

Part number SCE-EXDLK is sold separately as an option for standard EXD enclosures. SCE-EXDLK-MI is for mirror image enclosures, meaning left side mount.

All of the parts necessary for the installation are included in this MDV kit.

Image displays all components of the MDV kit laid out and numbered from 1 to 9.

MDV kit includes:

1 - Defeater Bracket (Provided with Disconnect handle)
2 - Primary Defeater (Provided with bolt pack # 128030)
3 - Extended Defeater (Provided with bolt pack # 128266)
4 - Upper Assembly: (Mdv Kit) (Provided with bolt pack # 128030)
5 - Defeater Retention Bracket (Provided with bolt pack # 128266)
6 - Defeater Guide Bracket (Provided with bolt pack # 128266)
7 - Lower Assembly: (Mdv Kit) (Provided with bolt pack # 128030)
8 - Single Defeater Hook (Provided with bolt pack # 128030)
9 - Double Defeater Hook (Provided with bolt pack # 128030)

Step 4: Handle and Hook Installation

Install the disconnect handle and mounting plate as shown.

Image shows the installation of the disconnect handle and mounting plate.

The disconnect operating handle must have a defeater with both up and down motion, such as "Square D", "Allen Bradley", and some "Eaton/Cutler Hammer" operating handles.

Install the extended defeater (# 3) to the primary defeater (# 2) and install the operating handle.
Install the double defeater hook (# 9) on the EXD enclosure door while the disconnect operating handle is in the 'off' position. Adjust the defeaters so they do not engage the top or bottom hook.

[▶️ Click for video]

Side view showing the extended length defeater hook (#129050) with a highlighted red section indicating focus on hook length.

Image shows the installed defeater hook and its engagement with the interlock mechanism.

Step 5: Retention Bracket and Upper Assembly

From inside the main enclosure, install the defeater retention bracket (# 5) to the extended defeater (# 3). Slide up the enclosure wall and tighten the fastener, ensuring the defeater can still move freely.
Install the single defeater hook (# 8) to the main enclosure door. Adjust with the disconnect operating handle in the 'off' position, ensuring approximately 1/8 inch clearance when the door is pushed shut.
Install the upper assembly (# 4) of the MDV kit and the defeater guide bracket (# 6) to the flange and tighten the fasteners. Ensure the MDV lever moves freely up and down.

[▶️ Click for video]

For EXD enclosures added to heavy-duty free-standing enclosures (XM enclosure), use "SCE-DCP" to close off existing disconnect cutouts and create provisions for the MDV and defeater guide bracket.

XD enclosures designed with an EXD installed are provided with studs on the inside flange for installation of an MDV and defeater guide bracket.

Image shows the defeater retention bracket being attached to the extended defeater.

Image shows the upper assembly of the MDV kit and the defeater guide bracket being installed on the enclosure flange.

Image shows an L bracket used as a door rod guide, attached to studs on the enclosure flange.

Use the second L bracket, included in the bolt pack, to assist as a door rod guide, as pictured. The L brackets share the same studs and nuts.

Step 6: Lower Assembly and Flange Adjustment

Adjust the MDV to your flange size

A - 3.50 inch flange is found on free-standing enclosures that are 3 doors and larger. Remove the 8-32 nuts and position at the outer holes.

B - 3.00 inch flange is found on most free-standing enclosures and is the preset location.

Install the lower assembly (# 7) of the MDV kit with a 1/4-20 nut on the stud adjacent to the door handle. Slide it all the way to the flange and tighten.
Adjust the MDV. With the disconnect operating handle in the 'off' position, pull the cable, drawing the defeater strike down so there is about 3/8 inch gap between the defeater strike and the cam. Tighten the screw to lock it in place.

Image shows the lower assembly of the MDV kit installed, with points labeled A and B indicating flange size adjustment options.

Step 7: Verification

Attention! Verify installation

Close and latch the EXD enclosure door, then the main enclosure door, fully closing the door handle.
The disconnect operating handle should be defeated and allow the operating handle to be turned to the 'ON' position.
With the disconnect operating handle in the 'ON' position, verify the door engages the defeater hook by trying to open the door.

Image shows the interlock mechanism in the 'ON' position, with the defeater hook engaged.

[⚠] Adjust the defeater hook on the door(s) as needed!

Operation

Opening the main enclosure door and EXD enclosure door with the power "on"

Defeat the operator handle per the device manufacturer's instructions.
Open the control enclosure door.

Image shows the disconnect operating handle with a defeat mechanism engaged, indicated by a symbol.

Opening the main enclosure door and EXD enclosure door with the power "off"

Open the master door on the main enclosure; the defeater will be released.
Open the EXD enclosure door.

Image shows the enclosure doors open, with the interlock mechanism disengaged.