We are looking for a transition splice for 3/c PILC to 3-1/c polymeric(XLPE) primary underground cables. The 350 PILC CABLE has conductors of a compact sector shape. We are not sure on how to calculate the PILC insulation diameter for each of the copper conductor since they are not round...
Does anyone know how to calculate the ampacity of a rectangular copper bar. Please see the attached drawing for details. Please note that the cupper bar is going to be utilized as a terminal point for conductors up to 600 volts. The terminations will have two hole lugs as as shown on the...
Does anyone have a clue on how to generate a 5th and other harmonic currents with the above mentioned current generator? The user's manuals and technical support have not been of great help. The intent is to generate the 5th and other harmonic currents to test how a given power meter performs in...
Can anyone provide feed back on why the NEC and NECS utilize the word "DUCT' and "CONDUIT" differently? It appears to be a contradiction on how such word is being utilized..... please advise
It is my understanding that overhead service conductors shall be protected against physical damage as per 230.50 A according to 230.50 B. Recently, an electrician installed overhead service conductors from the service drop conductors to a meter socket on a pole. The overhead service conductors...
Does anyone know why aluminum underground secondary cables have to be terminated on the secondary terminals of an overhead transformers with a spike connector? On the other hand,Copper underground secondary cables can just be terminated bare on the transformer secondary terminals without any...
A high rise building(condominiums) composed of more than three levels is to be electrically fed by an electric utility. There will be transformer vaults in some of the floor levels. They will be connected by concrete encased vertical raceways. I would like to know what is the minimum Fire Rating...
It is my understanding that in order for conductors or cables to be considered outside a high rise building NEC 230.6 shall be applied for the installation of the vertical raceways encased in concrete not less than 2 inches thick. Can anyone tell me what type of conduits are allowed to be...
I am currently evaluating the following two types of conduits to be utilized for passing through a concrete abutment support for a bridge crossing project. We have utilized hot dip galvanized steel conduits in the past. However, We have had situations where this type of conduit has been...
I am currently evaluating the following two types of conduits to be utilized for passing through a concrete abutment support for a bridge crossing project. We have utilized hot dip galvanized steel conduits in the past. However, We have had situations where this type of conduit has been...
Does the NEC,guarding of live parts, requires live parts to be guarded against accidental contact when qualified personnel are to be inside an electrical vault or transformer room? Please advice....
Can you please advice on the type of steel that can be exposed to a wet environment and not corrode as easily as other type of metals?
These are the options I am currently looking into:
1. Hot Dip Galvanized Steel
2.Stainless Steel
Please advise
Can someone advice if the strength of concrete depends on the size of the aggregate utilized to composed the concrete? What properties of the materials that make up concrete governed its strength? Thank you
Please provide feedback on the subject matter below....
What can it be said about having an electric utility be bonded to the building ground conductor for a high rise electrical distribution system? Should the electric utility be bonded to the building ground conductor or not? please advise......
Can you please advice on the type of steel which can be exposed to a wet environment and not corrode as easily as other type of metals?
These are the options I am currently looking into:
1. Hot Dip Galvanized: plain steel which is hot dipped after fabrication per ASTM A123.
2.Stainless...
It is my understanding that Steel Poles can be utilized as "Grounding Electrodes" as per NESC 094. However, it is not clear to me if a steel pole can be utilized as the Grounding Conductor for an electric distribution overhead system. Please advice.........
A bridge crossing hanging support system is to be designed for a suspended duct system between the steel I-Beams of a bridge. Holes will be drilled in the steel I-Beams to fasten(Steel Bolts) the duct supports to them. Do the bolts and steel members of the supporting frames for the duct system...
Hello Everyone,
I need assistance to find the the strength (Shear) of a weld as shown in the attached drawing.It is a 1/4 fillet weld to attach a
L 5" x 3 1/2" x 3/8" to an I beam by using a L 4" x 3" x 3/8"-6" Long. I have available to me a "Manual of Steel Construction, Eight edition"...
If a single phase motor is rated for 240V, what are the consequences if it is feed from a 208 single phase voltage source. Is there a NEMA or other standard that motors are manufactured according to? Can anyone explain how motors are rated and what type of motors are available for 208v Single...
