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We are currently in the concept stage of a design involving the deployment of Solar PV System in an existing Electrical Power Distribution System on a Campus and are inviting different views on certain issues. A Diesel Standby Electrical Power Generator is also existing. Two options are being...

Anyone know whether there are any Electrical Standards stipulating whether navigational lights on piers should have battery backup to ensure lights are always available in the event of a power outage? Can these be wired to the same branch circuits used to power general lights that are in close...

Does anyone know of any written material (books or publications) that has a compilation of Specifications for Procuring and Installing Mechanical and Electrical Equipment for Building Services?

All, My query sparked some very good discussions. I have learnt that vac design is not just about determining the heating or cooling load and selecting the equipment. It has a lot to do with devising the best strategy and balancing acquisition cost, energy consumption, system reliability etc...

Hello All, I am contemplating a ventilation and cooling system retrofit where two (2) 20 ton roof top packaged units are connected in parallel. i.e. The discharge and return ducts are interconnected so that a total cooling capacity of 40 ton is available. The rationale is that in the event of...

We are considering an air conditioning air distribution control strategy as follows: 1) VAV boxes in some zones are being proposed to regulate the air flow and zone temperature. 2) Other zones will have no control damper. No damper or VAV boxes to regulate the air flow. It is expected that air...

The brochure for the Flygt N-series pump highlights some of its features as non-clogging and ability to pass solids. However, it did not state what size solids the these pumps will be able to pass. I am currently reviewing the specifications for an NP-3171 pump with 4" inlet/outlet. Does anyone...

Is there a standard that governs the illumination levels (lux, footcandles) in a Milling Plant or similar production process? I have looked at OSHA 1926.56(a) requirements and observed minimum levels for corridors, warehouse, etc. These are minimum levels and not sufficient to facilitate work...

We have just finished sizing the pumps for a sewerage lift station. The static head is approximately 40 meters water pressure gauge. The pump delivers approximately 19.8 litres per second. The friction loss is approximately 5 meters water pressure gauge. In theory, the pump must overcome at...

All. Thanks for your reply. Section 805.2.1 of ICC International Energy Conservation Code 2003 states: Each Area enclosed by walls or floor-to-ceiling partitions shall have at least one manual control for the lighting serving that area. The required controls shall be located within the area...

I am designing the lighting system for an outdoor public rest room and outdoor stands (for viewing sports events). I placed the lighting controls (switches) for the restroom on the outside door of the rest room and those for the stands at the bottom and top of the stairs that lead up to the...

Hello, I am currently working on a carrier 30GB070940 Chiller with the following air handlers: 39ED-29 39ED-23 39EED-36. I believe that the chiller is 70tons. Can anyone confirm the size of the chillers and air handlers or say where I can locate the catalog? Not the wiring diagram please...