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ISI Electrical Requirements

The following is a list of commonly asked questions and answers on ISI electrical and physical space requirements.

 

  
Question: What electrical does ISI require for a 24-station computer lab?
Answer: Six dedicated circuits rated at 20 amps each with isolated ground to the panel.
If isolated ground circuits (IGs) are not available, they must at least be dedicated.
Question: How many circuits for the server and LAN/WAN rack hardware?
Answer: We recommend one 30-amp circuit for the rack with a dedicated isolatedground to the panel. The high capacity UPS for the rack will require a special outlet. The INPUT POWER CONNECTOR for the APC SU1400RM Uninterruptible Power Supply (UPS) from IBM is a power cord with a NEMA L5-15P (locking). This type of connector requires a NEMA L5-15R receptacle for proper operation. Please consult a licensed electrician for installation assistance. The use of a twist-lock plug in a rack environment ensures compliance with national electrical code standards. Please note, depending on local code or panel equipment, this circuit may be limited to 20 amps.
Photo: http://eoc.suny.edu/support/nema_l515p.asp
Question: How many circuits for the high capacity laser printer?
Answer: ISI's recommendation is:
One dedicated circuit rated at 20 amps with isolated ground (IG)
If an isolated ground circuit (IG) is not available, it must at least be dedicated.
However, in recognition of frequently limited budgets, the printer can be connected to one of the 20-amp circuits for the stations. It would be preferable to have a dedicated 20-amp circuit for the printer as it could then be used for other computer lab devices such as a projector. A typical projector for example, would overload a circuit if it were connected to any circuit with our standard four computer stations.
Question: How many stations for each circuit?
Answer: Typically four stations per circuit. Actually, typically, each circuit will be connected to two UPSs (Uninterruptible Power Supplies), and in turn, each UPS will be connected to two computer stations and monitors. For this reason, we recommend a dual outlet for each circuit. If furniture or other lab layout issues require a single UPS for each station, then each circuit will require a "quad" outlet.
Question: How many amps per circuit?
Answer: Twenty amps per circuit for every four stations.
Question:  What about a service outlet for cleaning equipment?
Answer:  ISI recommends an 8th circuit for a vacuum cleaner, floor waxing machine or other cleaning equipment. Under no circumstances should such equipment be plugged into any of the circuits for the stations or the server LAN/WAN rack. It is frequently the case that there is already a "service outlet" in a nearby room or hallway that can be moved or attached to for this purpose. In recognition of budgetary constraints, it may be necessary to use the printer circuit (#7) for service equipment. Should this be the case, the printer should be turned off and unplugged prior to use of this equipmenton the circuit.
Question: How much square footage is required for the LAN/WAN rack hardware and the space needed for the technicians to work at the rack?
Answer: Minimum: 3'x 6' but we recommended: 4' x 8'
If you have any questions or comments, please e-mail us by going to our technical support site at http://eoc.suny.edu/support/contact.asp.
 

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