Door Closing Mechanisms

Class 9423 door-closing mechanisms cover a range of enclosures with up to 91 inch high maximum door openings. The door closing mechanisms are designed to be used on control enclosures and interlocked with a Class 9422 disconnect device, although they all can be used independently. Three different systems are available and their use is as recommended below. A complete system is available for interlocking all the doors of a multi-door enclosure with the master door when using the 6" or 8" vault handle mechanism.

Note that the “Master Door” is defined to be the door of a single or multi-door enclosure which is interlocked directly with the disconnect device. The master door can be hinged on either the right or left hand side. It can be located in any position on a multi-door enclosure. On the other hand, the “Auxiliary Door” is defined to be the remaining door(s) of a multi-door enclosure which is (are) interlocked with the master door by means of the overhead interlocking system as illustrated on pages 8-26 and 8-27.

Selection Procedure

Step 1.
Determine enclosure construction (number of doors, door height, hinge location, etc.).

Step 2.
Determine Class 9422 disconnect device to be used—either a disconnect switch or a circuit breaker mechanism.

Step 3.
Determine the location of disconnect device and handle mechanism (right or left hand flange or center channel).

Step 4.
Select the door closing mechanism required.

Step 5.
Select auxiliary door closing mechanisms and multi-door interlocking hardware, if required. (A complete system for interlocking all auxiliary doors of a multi-door enclosure with center channel is available for the medium and large enclosures.)

Table 8.84:

Door Closing Mechanism

60" Maximum Door
Opening
(Recommended)

46–60” Door
Opening
(Recommended)

61–91” Door
Opening
(Recommended)

●	2 Point Locking is Standard

●	A Third Roller Latch Kit is Available for Three Point Locking

●	For 3/4" Door Depths

●	Use on Single or Multi-Door Enclosures

●	Use with Doors Hinged on Right or Left Side

●	Referred to as the 6" Vault Handle Mechanism

●	For 3/4" Door Depths

●	Use on Single or Multi-Door Enclosures

●	Use with Doors Hinged on Right or Left Side

●	Referred to as the 8" Vault Handle Mechanism

●	For 1-1/8" Door Depths

The door closing mechanisms listed below are for use on small to medium size single door control enclosures. They are designed to be used in conjunction with Class 9422 flange mounted disconnect switches and circuit breaker operating mechanisms; however, they can be used independently as well. When used on properly designed and gasketed NEMA Type 12 enclosures, they meet NFPA 79 standards.

Table 8.85:

Single Door Enclosures—NEMA Type 4 or 12 with 60" High Maximum Opening

Description

Use On
(Enclosure Type)

Use In
Conjunction
With

Door Latch
Handle
Length

Suggested
Maximum
Door Opening

Door
Depth

Type

$ Price

Two Point, Roller Latch, Door
Closing Mechanism for Use on
Enclosures with DOORS
HINGED ON LEFT HAND
SIDE.

NEMA Type 4 and 12
Sheet Steel