Exposed Installations on Ceilings

Yes.

Depends who installs last.

It depends on the:

1) MEP (Mechanical, electrical and plumbing) coordination.

2) Electrical should take precedence/

3) An electrical composite or coordination drawing must be prepared

4) An electrical engineer or the drafting supervisor must adjust position of the overlap components etc.

5) Etc.

< 2) Electrical should take precedence>

We normally gives priority to drainage.

The general "rule of thumb" is that the services most difficult to relocate or location being critical are given higher priority in their location. Some, such as VHAC are bulky and very inflexible. Similarly some others would be drain lines from storm drains or sewage. These are normally dependent on gravity or distances to work correctly. Plumbing supply lines are usually pressurized so they can normally be located anywhere. The numerous types of fittings, including some flexible ones, facilitates rerouting normally easily. If draining of lines is necessary adequate space for personnel to reach fittings is necessary.

Piping such as compressed air which accumulates water must be piped for proper drainage and removal of condensate from the piping. It can though be located in a relatively easy manner due to available flexible fittings.

Electrical wiring can normally be located anywhere there is adequate space. Since it is not dependent on gravity, it can be located almost anywhere that conditions permit. There are a proliferation of flexible fittings and techniques available to make most installation feasible. Conduit and EMT can be bent with a bender or a hickey to take almost any shape. There are also flexible conduits and armor such as BX that are extremely flexible. In many locations rubber insulated cords can be used if permitted by building codes.

If in question, consult an engineer of the applicable service or an inspector.

Good Luck, Old Salt

Yes. Check the local building codes. If not available check with the town/city building inspector of the appropriate trade.

Good Luck, Old Salt

Higher priority usually goes to items that are large and or geometrically critical, such as ductwork and grade-sensitive plumbing. Other piping, electrical raceways, and larger conduits would be intermediate. Small conduit and wiring have lower priority, because they are relatively easy to route around other obstacles.

Tornado is generally correct. You do have to honor the larger mechanical trades, simply because they require the most real estate; but astheticlly the designers will want to have a say as to location of lighting fixtures and where smoke detectors should go. And of course codes determine where several things have to be. Alan

All depends upon the site condition except for drainage (plumbing and equipment drain such as hvac, air compressor etc).

Light fixtures; better to consider to match with services having the lowest IL (Invert Level).

Air Conditioning Duct: can be adjusted according to the other services; but keep clearance around the duct for maintenance due to air leakage especially at corners and tap offs.

Fire Fightings, Water Pipes, Fire Alarm: can be adjusted according to the other services; but consider accessibility to all operating devices such as valves, measuring meters etc.

Electrical Cable Tray for Power & Low Current; Provide as low IL as possible because frequent additional works are expected along the tray for extra cabling. But some Utility Provider does not allow to run any other service above or below their HV Cable route, if it is happened to run its pathway through basements. This has to be considered during the installation of drainage system. All other services can be coordinated according to their requirements.

The best design engineers will have the layout completed for the location of all the trades.