Pole Mounting of Transformers

You have to check with local authorities about what is acceptable and what is not..and the type of transformer you purchased, is it pole mount type or floor mount type?...

B/R

Where in the universe is this thing to be located geographically?

Depends on your local electric code. What is acceptable one place is not at another.

OK 2 poles as support. By the time you've installed the transformer along with stay wires it will take up more space than a pad mounted unit!

I'd re-think the whole idea.

Each state in India has its own electrical inspectorate, who prescribe and inspect the installation prior to commissioning. If you are in Tamilnadu please please contace TNEB and check.

IE rules does not give any guide line on the subject of pole mounted transformers. There are standard practice considering installation of transformers. Normally four pole structures are used for pole mounting of transformers and that too only up to 100kVA transformers.A 250 kVA oil cooled transformer is too heavy to be installed on two pole structure and no electrical inspector will pass it due to safety considerations. You have to plan to install it on a platform. If it is a dry type transformer you may get the opinion of the local electrical inspector who has the authority to pass it before commissioning . It is totally the dictionary power of the electrical inspector to allow such a non standard work at his risk as he is responsible for any accident that happens after his passing it .As per IE rules he will be totally responsible and accountable for the approval of all electrical installations.

Dear Mr.Sriram,

Your CONTRACTOR is WRONG.The rules do permit pole mpounted transformer installation. Perhaps the contactor might have faced some problem and passing on to you.

rajeswari

Rajeswari,

Sorry to say that the contractor is not wrong. Once a contractor takes up the job it is his responsibility to get the job passed by the electrical Inspector. Since he realises that the electrical Inspector will not pass that arrangement he is not agreeing for that proposal. Even if you are the contractor you will also ask the party to get the electrical inspector's consent before accepting the contract. He is not passing on anything only advising correctly out of his experience.

As you are sure that the contractor is not wrong, why you waste your time here? find another solution that could be accepted by your local inspector.

Better to discuss with your inspector directly than with posters here, we all here only speculate, few only know the rules at your location

I do feel that the contractor IS wrong. If he is correct, let him quote the relevant IE Rules, prohibiting a certain capacity transforemr from being pole mopunted. ANd, even though individual states in India, do have their won electrical inspectorates, they all MUST follow only the IE Rules.

Moreover, you must have seen many 250kVA, 315kVA, 400kVA & even 500kVA transformers mounted on DP Structures, installed by electricity boards for power distribution to residential colonies. If it is wrong, how does the electrical inspector permit them, but not you?

Dear sriram,

Please see Indian Electricity Rules, 1956, cluse no. 69. The details of Pole mounting substation is given there.

Dear Manidra,

The IE rules 1956 clause no.69 provides only safety precaution about the platform of pole mounted transformer if platform is constructed ( regarding the clearance around the platform and earthing of railing around platform). There is no guide line weather a transformer can be erected on two pole or four pole or the size and capacity of the transformer which can be erected on pole.

" 69. Pole type Substation

Where platform type construction is used for a pole type substation and sufficient space for a person to stand on the platform is provided a substantial hand rail shall be built around the said platform and if the hand rail is is of a metal shall be connected with earth...."