Mechanical Electrical Plumbing (MEP)


Andrew Espinoza
Mechanical, Electrical, Plumbing, Plans
Examiner Supervisor
Office (210) 207-0152

The goal of the MEP staff is to review each set of construction documents with precision and promptness. Currently the MEP reviews are limited to commercial projects located throughout the city and surrounding areas. The staff provide plan review based on the following codes:

2012 International Mechanical Code
2011 NEC
2012 International Plumbing Code

City of San Antonio amendments to these codes are located at the following:
Adopted Code Amendments Adopted Code Amendments

When MEP work is being proposed, the following require engineered MEP plans from a professional engineer licensed in the state of Texas:

1. All group A (Assembly) Theaters, restaurants, bars, churches, Stadiums, etc.
2. All group E (Educational) Day cares, grades 1st - 12th, religious educational rooms, etc. 3. All group I (Institutional) Care facilities, assisted living facilities, social rehabilitation facilities, etc. 4. Buildings and structures over one story (Commercial).
5. Buildings and structures 5,000 square feet or more in area.
6. Electrical plans must be engineered when the total load exceeds 100 KVA single phase, 150 KVA three phase, or over 600 volts.

For smaller projects outside the scope of the above, your MEP design will be reviewed by the Minor Plans Review team. Please refer to the Minor Plan Review website for more information.

The following are requirements for submittal to Plan Review for engineered MEP projects:


HVAC equipment and schedules: Show locations, type, capacity, energy efficiency, and weight/support of all heating, ventilation and air conditioning (HVAC) equipment.

Rated Enclosures: Show or specify wall construction and opening protection where rated enclosures are required (heaters, boilers, etc., over 400,000 BTU; air conditioners over 100 HP, etc.).

Special Equipment: Show special equipment such as kitchen hoods, garage ventilation, paint booth exhaust, automatic fire suppression, etc.

Fire or Smoke Control: Define in specifications or on plans special use of equipment in conjunction with fire or smoke control.

Penetrations of Rated Assemblies: Show method of opening protection and note referenced listing or refer to drawings containing same information.

Special Requirement: Show appurtenances and required details such as flue vent type and size, expansion tanks, blow down systems, protection devices, means for combustion air and special use equipment.

Air Distribution System: Show all duct runs, fire/smoke dampers where applicable, sheet metal gauge thickness for medium and high velocity systems, type and class of non-metallic duct, etc.

2009 International Energy Conservation Code Compliance/Calculations for Mechanical Equipment. Using the COMcheck software, provide Mechanical Reports/Certificate


Utility Site Plan: The site plan should include location of all electrical equipment external to the building envelope, such as: power poles, overhead or underground electric lines, service equipment, pad mount transformers, generators, signs, pole lights, and exterior building lights.

Riser Diagram: The riser diagram should be a complete and comprehensive one-line diagram, including all service equipment, panels, transformers, generators, and fire pumps. The riser should also include all conductor sizes, over current protection sizes, conduit sizes, and ground fault protection at the service if applicable.

Grounding Detail: The grounding detail can be incorporated in the riser or detailed separately; either format should include all conductor sizes, ground rod size, and location of bond. As a minimum the grounding electrode system shall consist of a concrete encased electrode, cold water bond, structural steel bond and grounding electrode. All methods of grounding/bonding should be sized and installed as per NEC article 250.

Interior Electrical Layout: The power plan should include the locations, circuiting, and wiring methods, of all electrical equipment such as panels, transformers, disconnects, elevator equipment, receptacles, etc, The lighting plan should include the location of all fixtures and switches or other method of control (occupancy sensor, contactor, photo cell, time clock, etc,)All 2009 IECC requirements such as bi-level switching, occupancy sensors, master switches, etc. will be required where applicable.

Load Analysis: The load analysis should be calculated as per NEC article 220, and will need to include and indicate any existing load to assure adequate capacity of a common service, panel, load center, etc.

Panel Schedules: The panel schedules should include frame sizes, main lug or main breaker, feeder size, number of circuits, all overcurrent protection sizes (including main), NEMA classification of enclosure, and indication of any arc fault, ground fault, or shunt trip type breakers.

Fixture Schedule: The fixture schedule should include a fixture description, number of lamps, maximum lamp wattage, installed lamp wattage, and number of fixtures. IECC Lighting Compliance Certificate: The 2009 International Energy Conservation Code (IECC) is enforced. Com check- EZ versions 2000, 2001, and 2007-90.1and 2009 are accepted. For more information on obtaining necessary forms you may visit Preparation of Electrical Drawings: A signed and dated Texas P.E. seal will be needed on plans when required by the Texas Engineering Practice Act, or when plans meet the requirements of Section 10-92 (e) of Chapter 10 of the City Code. All plans not requiring a P.E. seal will need a signed and dated architectural seal or the name and master number of the master electrician responsible for the plans.

Additional Electrical Notes:

1. Once CPS Energy has approved two services to one structure, the required two hour fire barrier that separates the areas served by each will need to be indicated on the appropriate architectural drawings as well as the electrical drawings.
2. Rooms containing large equipment as defined by NEC article 110.26 (c) (2) will need to indicate the correct door swing and hardware. This information will need to be shown on the appropriate architectural drawings as well as the electrical drawings.
3. Disconnecting means for heating equipment covered in article 424 of the NEC and for Refrigeration equipment found in article 440 of the NEC will be required to be independently supported off the unit. This requirement will also apply to the required servicing 120 volt receptacle outlet. Please reference Section 10-93 (1) (e) & (f) of Chapter 10 of the City Code for more details.
4. Exterior lighting designs on all commercial structures in addition to meeting NEC requirements will also need to be in accordance with section 35.396 of the Unified Development Code (UDC).

Please see the Electrical FAQ for more information.


Plumbing Fixtures: Show fixture numbers and locations and provide basis for number of fixtures. Include water closets, urinals, lavatories and drinking fountains.

Building Drain System: Show the under-floor system of the drain waste and soil piping, indicating pipe sizes and slope. Provide riser diagram for multiple fixtures. Plumbing Riser and/or Isometric: Provide diagram of installation for waste, vent, and water piping for multiple fixture installations.

Building Utilities: Show the sanitary building sewer, storm sewer system, water service, gas service and all connections to the public utilities.

Materials: Indicate all piping materials.

Water System: Provide known water pressure and supply pipe sizes and calculations of water system, water heater data, and hot water system and accessories (expansion tank, vacuum relief, safety devices, etc.), backflow prevention requirements, pressure reducing valves, etc.

Venting System: Show pipe sizes, size of vent through the roof and connection to building drains.

Special Requirements: Show all required appurtenances, such as grease interceptors, sump pumps, sewage ejectors, sample ports, backflow preventers, backflow valves, and special fixtures. Provide appropriate calculations.

Gas Piping System Diagram: Provide schematic diagram of gas piping system Including system operating pressure. Developed lengths, gas outlets with stated demand in CFH.

Contact MEP Staff:

Mechanical,Electrical, Plumbing, Plans Examiner Supervisor
Andrew Espinoza

Senior Plans Examiner
Valerie Gleason
Valerie Gleason

Mechanical Plans Examiner
Roger Cortez
Roger Cortez

Plumbing Plans Examiner
Bruno Fey

Business | City Services | Departments | Government | Residents | Recreation
Home | Privacy Policy and Disclaimer

Website best viewed using Microsoft Internet Explorer 7.0
with screen resolution settings of 800x600.