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Junction Enclosure
Product Information | Ordering
Information
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| 4000 Amp Junction Enclosure |
Product Information
Junction enclosures are becoming more common with growth. When designing a system for growth engineers
must look at future expansion. With expansion, an adequately sized transformer must be considered to handle future
loads. In the beginning, the transformer must be physically capable (on the secondary side) to tap to various points in
the plant. But as future loads are added and the plant expands in physical size, so too must the transformer taps.
Gilbert Electrical has the solution with it’s secondary tap junction enclosure. Built from
rugged 11 gauge steel and rated NEMA 3R equivalent, this unit will grow with the system and last just as long. Junction
enclosures gives the user the ability to increase transformer taps without direct alteration of the transformer. By
sizing the junction enclosure for the full load current rating of the transformer, a customer may connect the incoming
cables from the transformer to the phase buses located inside the junction enclosure. Doing this allows you the room for
multiple outgoing taps to various loads. Junction enclosures are a convenient way to allow for future system expansion.
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As shown in Figure 1, a junction enclosure connects to the secondary side of the
transformer. Since a transformer may have only a limited number of secondary taps, a junction enclosure
can be supplied with virtually unlimited taps. This gives the user the ability to plan for growth without
the worry of altering the transformer or even perhaps ordering a new one.
Junction enclosures are supplied with a choice of physical size, voltage rating, max
amp rating, system type, type of bus and so on. Depending on the need of the system, Gilbert should have
no problem finding the right one for you.
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Figure 1 |
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Ordering Information
Below is a guide that can help you when ordering a Gilbert
Electrical junction enclosure. Following the example and information, you can construct a part number for a unit that
meets your exact requirements. Refer to this part number when ordering.
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KMJE |
6 |
-4 |
SB |
-34 |
-18 |
G |
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| Manufacturer's ID |
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Ground Bus
Add a "G" to end of part number when unit must include a ground bus |
Voltage Class
| 480 V |
- |
4 |
| 5 kV |
- |
5 |
| 600 V |
- |
6 |
| 15 kV |
- |
15 |
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Number of Holes per Phase
When filling in this number, keep in mind that a single NEMA 2 hole bolt hole pattern can support two
lugs (front and back) |
Current
Rating
| 400 A |
- |
4 |
| 500 A |
- |
5 |
| - |
- |
- |
| - |
- |
- |
| 1000 A |
- |
10 |
| 1200 A |
- |
12 |
| - |
- |
- |
| - |
- |
- |
| 4800 A |
- |
48 |
| 5600 A |
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56 |
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Type of System
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11 |
- |
single phase, 1 wire |
| 12 |
- |
single phase, 2 wire |
| 23 |
- |
2 phase, 3 wire |
| 33 |
- |
3 phase, 3 wire |
| 34 |
- |
3 phase, 4 wire |
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Type of Bus
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CB |
- |
copper bus |
| SB |
- |
silver plated bus |
| TB |
- |
tin plated bus |
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The first four characters in the part number are dedicated to the
manufacturer. These letters distinguish the product from other items manufactured by Gilbert Electrical. |
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The following number indicates the voltage class of the unit. This
must be known so the proper insulation of the unit can be maintained. Gilbert Electrical can provide junction
enclosures above 15 KV. |
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In order to properly size the bus, the max current load of the
transformer must be entered. If the current rating of the transformer does not match the figures above, always
order the next available higher current rating. |
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Type of bus is for environmental conditions. If the weather is mild
and cool, round edge copper bus is adequate. For extreme conditions, tin plated may be required. |
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To supply the correct number of phase busses the system type must
be know. If the system is a three phase, four wire system, then three phase busses and one neutral bus must be
supplied for a total of four busses. |
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Given the vast number of loads the junction enclosure may be
supplying, the number of Nema 2 hole bolt patterns must be entered here. The number entered will indicate the
number of incoming plus the number of outgoing conductors. Always make sure you have more than enough. Note:
One NEMA 2 hole bolt pattern can support 2 lugs (front and back). |
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Last, add a "G" to the end of the part number if a ground
bus is required. |
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