Separate Enclosures

The Class 9991 enclosures listed below accept an open type Class 8502 or 8536 Type S, NEMA Size 0, 1, 1P, or 2 contactor or starter along with a fused control circuit transformer (Form F4T) to allow field assembly of enclosed controllers. In the cover of the Class 9991 Type SCG1 enclosure, knock-outs are provided for field addition of Class 9999 cover-mounted control units. All other Class 8502 & 8536 enclosures include a panel with space and drilling for an open-type device and a fused control circuit transformer. In addition, three closing plates are included in each cover for easy installation of Class 9001 Type K or SK control units.

Oversized enclosures for open type Class 8903 Type L & LX, 20 A and Type S, 30 and 60 A electrically and mechanically held lighting contactors include a panel with space and drilling for an open- type contactor and fused control circuit transformer (Form F4T) and/or an auxiliary relay for use with single pole pilot devices (Form R6). When an auxiliary relay is required, use a Class 8501 Type XO11 relay. Three closing plates are provided as standard for easy installation of Class 9001 Type K or SK control units. Note: A Class 9991 Type SCG1 NEMA 1 separate enclosure can also be used for Class 8903 Type SMO, 30 A electrically held lighting contactor if Form F4T (control transformer), with or without cover control units is required.

Table 16.301:

For Use With

Class 9991 Enclosure

Recommended Class 9070c
Transformer Selection

Fuse
Block

Class

Type

NEMA
Size or
Ampere
Rating

No.
of
Poles

General
Purpose
NEMA 1

Watertight and
Dusttight
Stainless Steel
NEMA 4e

Dusttight and
Driptight
Industrial Use
NEMA 12b

Magnetic Contactors and Starters

d
8502
&
8536

SAO,
SBO
&
SCO

1–3

50 VA

Class
9999
Type
SFR4

4–5

2–5

Lighting Contactors, Non-Combination

LO,
LXO

50 VA

50 VA

1–3

4–5

2–5

a	For mounting in SCG1 enclosure, a Class 9991 Type S1 adapter bracket is also required — $29.00

b	NEMA 12 modified for outdoor use (see below).

c	For price list and complete description, see the Class 9070 section. Note: Class 9991 Type SCG1 enclosure is provided with a Class 9999 Type SF4 fuse block as standard.

d	For contactors (Class 8502), a separate closing plate is provided with each enclosure to replace the reset mechanism with the exception of Class 9991 Type SCG1 which requires a separate reset closing plate Class 9999 Type SG2 — $9.50

e	The standard cabinet has a brushed finish.

f	Mechanically held.

NEMA 12/3R Enclosures Modified for Outdoor Applications
(not to be used in salt air or corrosive environments)

Field Modifications for NEMA 3 dusttight, raintight and sleet resistant outdoor applications are as follows: Watertight conduit hubs or equivalent provision for watertight connection at the conduit entrance shall be used.

Field Modifications for NEMA 3R rainproof and sleet resistant outdoor applications are as follows:

1.	Watertight conduit hubs or equivalent provision for watertight connection at the conduit entrance, when the conduit enters at a level higher than the lowest live part, shall be used.

2.	Drain holes of 1/8 inch diameter shall be added to the bottom of the enclosure.

Class 9001 Type K oiltight/watertight control units can be easily installed in NEMAs 4, 12, and oversized NEMA 1 separate enclosures provided with closing plates. When installing control units simply remove the closing plates and install the proper Class 9001 Type K components. Convenient control unit kits complete with assembled and pre-wired operators for quick installation are available as Class 9999 user modification kits. See Table 16.302 for contents of each control unit kit. Class 9001 Type SK NEMA 4X corrosion resistant control units may be used as an alternate.

Table 16.302:

Control Unit Selection Table

Class 9999
Type

1-9001 KR1B
1-9001 KR1R
1-9001 KN201
1-9001 KN202
2-9001 KA1

Start Operator
Stop Operator
Start Legend Plate
Stop Legend Plate
Contact Block