Electrical Interlocks
nVent HOFFMAN
Product Overview
This document provides technical information and compatibility details for Hoffman Electrical Interlocks, specifically highlighting the model A-EK115NOH.
The A-EK115NOH electrical interlock is designed for operation on 120/110 VAC, with a current rating of 100/120 AMPS at 60/50 HZ. It is suitable for use in environments with a maximum ambient air temperature of 60°C.
Manufactured by Hoffman Engineering Company, Anoka, Minnesota, USA.
Document Revision: E. Part Number: 99401605.
Enclosure Compatibility Table
| Bulletin Number | Enclosure Description |
|---|---|
| 2.12 A4, A12, A13* | NEMA 4 and NEMA 12 Single-Door Enclosures |
| 2.19 A4 | Two-Door NEMA 4 Enclosures |
| 3.00 A15* | Flush-Mounted NEMA 12 Single-Door Enclosures (see Detail A) |
| 2.00 A1SM, A1M, A1L | NEMA 1 when "A" dimension (enclosure height) is less than 30 in. (see Detail B) |
| 1.69 A1SM, A1M, A1L | NEMA 1 when "A" dimension (enclosure height) is 30 in. or more |
| 2.19 A1SM, A1M, A1L | Extra Large NEMA 1 |
| 1.56 A51CH, A51NF, A53, A51FL, A51, A51A, A51S, A51SE | Larger sizes of Hinge-Cover JIC Boxes: A51CH: CH and CHS suffix; A51NF: CHNF and CHNFS suffix; A53: CHEMC suffix; A51FL: CHFL suffix; A51: CHQR suffix; A51A: CHAL suffix; A51S: CHNFSS and CHNFSS6 suffix; A51SE: CHEMCSS suffix |
| 2.06 A52* | Large JIC Boxes when "B" dimension (enclosure width) is 24 in. or less |
| 2.56 A52* | Large JIC Boxes when “B” dimension (enclosure width) is more than 24 in. |
| * No longer for sale | |
Safety Warning
WARNING: To avoid electric shock, do not energize any circuits before all internal and external electrical and mechanical clearances are checked to assure that all assembled equipment functions safely and properly.
Certifications and Compliance
This accessory maintains UL/CSA Type 12, 4, 4X when installed per these instructions.
This accessory is covered by UL file E61997 and CSA file LR42186.
Mounting Details
Detail A: Bulletin A15 Flush-Mounted Enclosures
Description of mounting hardware for Flush-Mounted Enclosures (Bulletin A15): Includes screw, nylon washer, strike, double nut, and flat washer (not furnished).
Diagram Description: Shows a side view of the enclosure door and frame with mounting points. Key dimensions include a 0.06 inch offset. The mounting mechanism involves a strike, double nut, nylon washer, and screw.
Detail B: Bulletin A1SM, A1M, A1L NEMA 1 Enclosures
Description of mounting hardware for NEMA 1 Enclosures (Bulletins A1SM, A1M, A1L): Similar hardware to Detail A, including screw, nylon washer, strike, and double nut.
Diagram Description: Shows a side view of the enclosure door and frame. Key dimensions include a 0.06 inch offset. The mounting mechanism involves a strike, double nut, nylon washer, and screw.
NEMA 1, JIC, and Large JIC Enclosures Mounting
Diagram Description: Illustrates mounting hole patterns on an enclosure door. For NEMA 1, JIC, and Large JIC enclosures, the pattern consists of four holes (4X Ø.219) spaced 2.75 inches apart horizontally and vertically. An offset of 1.38 inches from the door's center line is indicated. The diagram also shows an "ADJUST AS REQUIRED" feature and a 0.06 inch offset for the mounted component.
NEMA 4 and NEMA 12 Enclosures Mounting
Diagram Description: Depicts mounting hole patterns for NEMA 4 and NEMA 12 enclosures. The pattern includes four holes (4X Ø.219) with 2.75-inch spacing. An offset of 1.38 inches from the door's center line is shown, with an additional 0.50 inch and 1.00 inch dimension for enclosure offset. The mounting assembly includes a mounting plate, gasket, washer, lock washer, hex nut, double nut, strike, nylon washer, and screw.
The diagram also shows an "ADJUST AS REQUIRED" feature and a 0.06 inch offset for the mounted component.
Large NEMA 3R Enclosures Mounting
Diagram Description: Details mounting for Large NEMA 3R enclosures. The hole pattern is similar to NEMA 4/12 (4X Ø.219, 2.75-inch spacing). An offset of 1.38 inches from the door's center line is indicated, with an enclosure offset of 0.50 and 1.00 inches. The distance from the edge of the door is 2.72 inches. The mounting hardware includes a mounting plate, gasket, washer, lock washer, hex nut, double nut, strike, nylon washer, and screw.
The diagram also shows an "ADJUST AS REQUIRED" feature and a 0.06 inch offset for the mounted component.
Concept Enclosures Mounting
Diagram Description: Illustrates mounting for Concept Enclosures. The hole pattern is similar to other types (4X Ø.219, 2.75-inch spacing). An offset of 1.38 inches from the door's center line is shown, with an enclosure offset of 0.50 and 1.00 inches. The distance from the edge of the door is 2.43 inches. The mounting hardware includes a mounting plate, gasket, washer, lock washer, hex nut, nut plate, strike, and screw.
The diagram also shows an "ADJUST AS REQUIRED" feature and a 0.06 inch offset for the mounted component.
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