Electrical Cabling

Preferred AC Power System
To ensure that electrical noise produced by other equipment does not create interference for the Aloha System Hardware, all power conductors and equipment-grounding conductors must be isolated from other power circuits in the facility. To accomplish this, the preferred method of providing power is the installation of a power distribution panel intended for the sole use of the Aloha System Hardware.

This dedicated power panel shall not be used to supply other electrical loads in the facility. The panel will be supplied by a feeder run directly from the main or source panel for the facility.

Personal Computers, and/or Stand-alone devices are to be powered from a single circuit, All branch circuits shall include a separate neutral (ground conductor) and equipment grounding conductor unless otherwise indicated.

Notes on the Preferred AC Power System
Does not supplant national, state, or local electrical codes. Each Branch Circuit shall be installed in a dedicated ferrous metal conduit and have separate neutral and ground conductors. Aluminum conduit is not acceptable.

If the length exceeds 100 feet, increase all conductors (including ground) one wire size for each additional 100 feet of length.
The neutral conductor from the main or source panel to the dedicated Aloha panel is two sizes larger than the phase conductors. The larger wire size is necessary to accommodate the third harmonic current caused by the switching power supplies in the Aloha User Workstations, and to minimize the possibility of common mode noise occurring on the power distribution circuits.

All power distribution circuits shall be installed in a dedicated ferrous metal conduit that contains only the Aloha supply and ground conductors. Data communication cables shall be installed in separate ferrous metallic conduits. All AC Power Receptacles shall be the isolating ground type and shall be installed in accordance with the specifications contained in the AC Power Receptacles section.

Aloha approved Uninterruptible Power Supplies (UPS) are required for each Aloha System Processor (provided with the Aloha equipment package).

AC Power System Grounding
Proper grounding of the AC power system is critical to achieve a high degree of equipment performance and reliability- To minimize the introduction of electrical noise, a separate equipment grounding system must be installed. The specific grounding requirements are outlined below.

ALOHA Power Panel Grounding
An insulated equipment grounding conductor (sized the same as the supply conductors) shall be installed in the same conduit as the supply conductors from the main or source panel to the dedicated Aloha POS equipment panel. This equipment grounding conductor is to be terminated on the ground bus in the main panel. At the Aloha POS equipment panel, install a ground bus that is electrically isolated from the panel frame and terminate the feeder equipment grounding conductor on this bus bar. The metallic feeder conduit will be used as the equipment grounding system for grounding the AC power panel frame, metallic conduit system and metallic junction boxes.

ALOHA Branch Circuit Grounding
Each branch circuit from the dedicated power panel to the Aloha System Device receptacles shall include a full size (same as supply conductors) insulated equipment grounding conductor installed in the same conduit as the supply conductors. The conduit must be dedicated to Aloha equipment. This isolated grounding conductor shall be terminated on the isolated ground bus bar in the panel and on the equipment grounding terminal of a NEMA IG5-15 isolated grounding type receptacle.

Alternate AC Power System
For existing construction where the existing facilities do not justify the installation of a dedicated power panel, an alternate method may be employed.

Notes on the Alternate AC Power System:
Does not supplant national, state, or local electrical codes.
This method will provide power for all Aloha System Hardware Devices directly from the MAIN or SOURCE power panel. When using this method, it is imperative that no system component be supplied from any power panel other than the main or source panel.

All Aloha System hardware and system processor(s) shall be supplied with circuits run directly from the main panel.

Each branch circuit shall be installed in a dedicated ferrous metal conduit and shall include a full sized (same as the supply conductors) insulated equipment grounding conductor installed in the same conduit. Aluminum conduit is not an acceptable alternative to ferrous metal. The isolated grounding conductors are to be terminated directly at the ground bus in the main or source panel. No grounding conductors shall be terminated on any metallic conduit, water pipe, or ground rod.

All AC Power Receptacles shall be the isolating ground type and shall be installed in accordance with the specifications contained in AC Power Receptacles section. Aloha approved Uninterruptible Power Supplies (UPS) are required for each Aloha System Processor (provided with the Aloha equipment package).

Relaxed / Power Conditioned A C Power System
When providing the Preferred or Alternate AC Power System is cost prohibitive and/or would require major structural changes, we have defined a relaxed AC Power System that may be used. However, the Preferred or Alternate AC Power System is recommended by ALOHA.

The Relaxed/Power Conditioned AC Power System is described as follows:
Aloha-approved Power Conditioners are required at all Aloha Remote Printer locations (will be provided with the Aloha equipment package).

Aloha-approved Uninterruptible Power Conditioners (UPC) are required at each Aloha Personal Computer.

All Aloha AC Power branch circuits must originate from the same "non-dedicated" Power Panel. This Panel must be equipped with an "isolated" ground bus that is electrically isolated from the panel frame and must be provided with an insulated equipment grounding conductor (sized the same as the supply conductors) which is installed in the same conduit as the supply conductors from the main or source power panel. The equipment grounding conductor must be terminated on the ground bus in the main or source panel and on the "isolated" ground bus in the 'Non-Dedicated' Power Panel.

* Any Power Panel supplying heavy equipment within the facility should not be selected as the "Non-Dedicated" Power Panel supplying the Aloha equipment.

* Aloha AC Power Circuits must be "dedicated" for Aloha equipment. No equipment other than Aloha Equipment may be supplied by these "dedicated" circuits.

* Aloha AC Power Circuits must also be installed in a dedicated conduit system. No circuits other than Aloha circuits may exist in this dedicated conduit system. In addition, the conduit used for the Aloha AC Power Circuits must be ferrous metallic. Flexible, rigid, or greenfield metallic conduit is acceptable. Aluminum conduit is not acceptable.

Each "dedicated' Aloha AC Power circuit must include a M size (same as supply conductors) insulated equipment grounding conductor installed within the same "dedicated" conduit system as the supply conductors. This ground conductor must be terminated at the "isolated" ground bus in the "non-dedicated" Power Panel, and on the grounding terminal of each Isolated Ground AC Power Receptacle.

All AC Power receptacles shall be the isolated ground type and shall be installed in accordance with the specifications contained in the AC Power Receptacles section.

AC Power Receptacles
In order to maintain isolation of the equipment grounding conductor from the conduit system, an isolated ground receptacle must be used. This type of receptacle (usually identified by an orange face) provides an insulating barrier between the equipment grounding terminal and the receptacle mounting strap. All branch circuits from the Preferred, Alternate, and Relaxed/AC Power Conditioned ALOHA power panel must be terminated with isolated ground receptacles,

Standard receptacles bond the equipment grounding terminal (green screw) to the receptacle mounting strap and metallic conduit when the receptacle is mounted to the box. This defeats the purpose of the isolated grounding system. No equipment bonding jumper is to be installed from the receptacle grounding terminal to the outlet box.

NOTE: NEC Article 250-74, Exception 4 permits installation of the isolated ground receptacles and isolated equipment grounding conductors specified in this section.

If a duplex receptacle is installed and only one socket is to be used, the unused socket should be disconnected. This is to prevent the temptation of using the outlet for equipment that may produce extraneous ground currents (e.g., floor buffers, vacuum cleaners, etc.). The correct receptacle types are listed below.

Isolated Ground Receptacles RECEPTACLE TYPE NEMA P/N 125V., 15A., Simplex IG5-15RI 125V, 15A., Duplex IG5-15R2

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