LAB AT A GLANCEMEP-802Ask the Copilot about this lab →
Codes & standards 1
BS 7671
Regions 1
Dubai
Views
Calculator and tables
Q&A502 coordination questions →Site cases20 Coordination site cases →
MEP-802 · POCKET MODE · ON SITE

Pocket Site Calculator

The quick numbers you need on site, sized for a phone: unit conversions, current from load, voltage drop, Ohm's law, pipe and duct velocity, cooling from water flow and a rough cooling load. Add it to your home screen and it works offline.

Tip: on your phone, use the browser menu and choose Add to Home Screen. Every box remembers your last values.

Convert

Current from load

Voltage drop (quick)

Resistance only at 70 °C. Good for a quick check on site. Use DES-604 or the cable sizing lab for the design.

Ohm's law

Pipe velocity

Duct velocity

Cooling from water

Rough cooling load

About this lab: Pocket Site Calculator

Pocket Site Calculator

Quick MEP calculations on your phone: unit conversions, current from load, voltage drop, Ohm's law, pipe and duct velocity, cooling from water flow and rough cooling load.

Topics you can explore

  • Unit conversions
  • Three phase current
  • Voltage drop
  • Ohm's law
  • Pipe and duct velocity
  • Cooling from flow and ΔT

Practical engineering example

On site you can check that a 60 m run of 6 mm² copper carrying 27 A on 400 V three phase drops about 10.5 V, or 2.6%, which is inside the usual 5% limit for power circuits.

Developed by Eng. Mannan Maqsood. Verify against current project requirements and the applicable authority rules.

Standards and regions covered

Built with BS 7671, DEWA, CIBSE and ASHRAE rules of thumb used across the UAE, Saudi Arabia, Qatar, New Zealand and Australia. Engineers use it on projects in Dubai, Abu Dhabi, Sharjah and the Northern Emirates, Saudi Arabia and Qatar, and in Auckland, the rest of New Zealand and Australia. Always confirm the edition your authority or client has adopted before relying on a result.

NEXT STEP

Where to go from here

Related labs that pick up where this one ends.

Cable Sizing & Voltage DropThe full cable design.DES-604 →FAT, SAT & Site Testing LabTests and commissioning checklists.SITE-506 →Duct Sizing & Fan Static LabSize the whole duct tree.HVAC-403 →Plant Room & Riser Space PlannerConcept plant space for all trades.MEP-801 →
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