Developing Electrical Installation Details

I think you may be looking at either the wrong type of detail, or going way to far into detail Ankush. You have to bare in mind, that any contractor conducting the actual work should have a minimum level of competence in the work, a design shouldn't be written to a level of detail as if it were for a novice.


This is what I normally do for design work, using your examples to demonstrate what I mean.


Example 1) Specify approx. size of junction boxes (normally determined by number/size of cables to go inside) and minimum technical specs required (minimum current rating, IP grade, material of item and any manufacturing standards applicable such as BS or EN standards), instruct it is to be mounted to a steel column via unistrut hardware and mechanical fixings. Again, include the minimum technical specs required such as gross weight it must hold, the material it is to be made of including nuts/bolts etc, and any finishing required such as applying zinc based paints for additional corrosion protection. On a side note, always try and avoid mechanically fixing of two different metal types together, especially in corrosive areas.


as a basic example of what I believe your talking about I would typically state:


IP66 Junction, 20A Imin, 240VAC, X Kgs, manufactured to BS EN XXXX with minimum terminal capacity for X cables, to be mounted 1500mm from floor level with mechanical fixings to steel column. Junction box to be mechanically fixed to steel columns made of hot dipped galvanized unstrut fixings connected via stainless steel screws/bolts/nuts/washers. All cuts to be coated in a zinc rich cold galvanizing paint.


Example 2) you wouldn't normally need to go into this level of detail. Normally when you buy a junction box or similar, it either comes with screws/bolts designed to hold it according to its use, or the instructions from manufacturer will specify.


Example 3) You may need to re-write this one, I didn't quite understand the question.


Example 4) Again, I don't fully understand the question but I believe the answer would be similar to example 2. However, if you need to specify a screw or bolt etc, you need to take into consideration how much weight it must hold, the environment to which it is to be installed and any applicable regulations that apply to where ever this is to be installed. Manufacturers data will tell you what each bolt of screw is applicable for doing, and select the one that meets your minimum requirements or greater.


A designer doesn't usually need to go into such in depth detail. A lot of answers will come from manufacturers instructions or datasheets, and some should be expected from competent contractors.


Hope the above helps Ankush!

I think you may be looking at either the wrong type of detail, or going way to far into detail Ankush. You have to bare in mind, that any contractor conducting the actual work should have a minimum level of competence in the work, a design shouldn't be written to a level of detail as if it were for a novice.


This is what I normally do for design work, using your examples to demonstrate what I mean.


Example 1) Specify approx. size of junction boxes (normally determined by number/size of cables to go inside) and minimum technical specs required (minimum current rating, IP grade, material of item and any manufacturing standards applicable such as BS or EN standards), instruct it is to be mounted to a steel column via unistrut hardware and mechanical fixings. Again, include the minimum technical specs required such as gross weight it must hold, the material it is to be made of including nuts/bolts etc, and any finishing required such as applying zinc based paints for additional corrosion protection. On a side note, always try and avoid mechanically fixing of two different metal types together, especially in corrosive areas.


as a basic example of what I believe your talking about I would typically state:


IP66 Junction, 20A Imin, 240VAC, X Kgs, manufactured to BS EN XXXX with minimum terminal capacity for X cables, to be mounted 1500mm from floor level with mechanical fixings to steel column. Junction box to be mechanically fixed to steel columns made of hot dipped galvanized unstrut fixings connected via stainless steel screws/bolts/nuts/washers. All cuts to be coated in a zinc rich cold galvanizing paint.


Example 2) you wouldn't normally need to go into this level of detail. Normally when you buy a junction box or similar, it either comes with screws/bolts designed to hold it according to its use, or the instructions from manufacturer will specify.


Example 3) You may need to re-write this one, I didn't quite understand the question.


Example 4) Again, I don't fully understand the question but I believe the answer would be similar to example 2. However, if you need to specify a screw or bolt etc, you need to take into consideration how much weight it must hold, the environment to which it is to be installed and any applicable regulations that apply to where ever this is to be installed. Manufacturers data will tell you what each bolt of screw is applicable for doing, and select the one that meets your minimum requirements or greater.


A designer doesn't usually need to go into such in depth detail. A lot of answers will come from manufacturers instructions or datasheets, and some should be expected from competent contractors.


Hope the above helps Ankush!