5KV Electrical Connection

What kind of power values do you handle?

I regularly have 5KV connections into small boxes with an SHV connector. None of this is done in conduit. But this is only a bias voltage for detectors that the supplies trip off in the milliampere range. You've got to provide more information.

Thank you for your responses.

Here are a few details: 100-200A at full load. Cable is semiconductor type with drain wire. Various manufacturers could be used.

Half to a full megawatt of power at full load and you're asking us?!?!?!

At work I could look at my NEC code book or query a few power engineers/electricians but to be honest I'm not comfortable doing that. For this much power you should not be getting this answer here. You need a qualified engineer and/or liscensed electrician. Hire one!

200A limited space? I should not put too much stress in curves with this type of power. Large spaces- non compromises - and pushing back into the conduit? How you will ever service this? I agree with Redfred, and would follow his good advice.

A range of 100-200A is not exactly "detailed." The motor ought to have a FLA rating to 2 or 3 significant digits. The wire ampacity must be at least 1.25 times that, maybe more if the ambient temperature is high (and some other possible factors). The insulation must be capable of withstanding the maximum possible voltage and maybe some other environmental conditions. There are minimum bending radius rules for wire of various sizes and types, so the junction box must be large enough to accommodate such bending.

I agree with you all on the above answers.

The installation will be done by qualified electrical contractors. I usually don't need to worry about these details as the standard connection box is large enough but on this project the customer is limited in space. We were asked to install a smaller connection box. The conduit opening will be in straight line with the connection.

The source is my "power" inverter which is current limited and reacts within micro-seconds to any overloads. The power is applied progressively. No inrush.

Thank you

Ask the licensed electrician that holds the license (The Qualified Individual) on the license) about this.He should be familiar with the rules and is ultimately responsible for supervising and directing the work of his men.

If memory serves me correctly (and it has been a LONG time) a straight thru connection actually requires more space to meet code than a turn.

A rough rule of thumb is: 8 times your largest conduit plus the sum of all other conduits in the box.You still must apply other factors to this rule to get actual proper dimensions.

As for the connections? All connections must be readily accessable.

A limited space is no excuse for violating code, you must have adequate space.Find another place with adequate space if needed.

What is your vested interest in this project?

HTRN

Simply accommodating my customer's request.

As previously stated, you cannot violate code to accommodate a customer's request. The ultimate responsibility and liability for code compliance and safety is in your hands, not the customer's.

You say "your customer" then you must be the "Qualified Individual", for only such an individual can legally bid an electrical job, at least in the USA.

If you are not, refer to your Electrical Contractor for guidance. I am sure he will concur with my advice.

HTRN