frizbeedog
Senior Member
- Location
- Oregon
Cable Comany claimed that the home had improper grounding....and had measured from their cable (the conductor, not the shield) to the house ground and had measured 50 volts. Come to find out that this measurement was conducted at a surge protector plug strip and not at the outlet which was inaccessible (bookshelves).
They also said they were getting shocked when trying to connect their equipment to the side of the home (metal skin), and an associated ground which was attached to the trailer frame.
I attempted to measure the same way they did with no results, but had readings from 2 to 7 volts when measured to the shield.
Found the proper 4 wire feed installed via overhead connection to a post mount service adjacent to the home.
The only abnormal voltage readings I had were these:
All circuits on:
Line 1: 114 V
Line 2: 132 V
Turn on and off various circuits an found two circuits that, when both were "off", brought the voltages back to normal:
Line 1: 123 V
Line 2: 123 V
One circuit was connected to a multi-wire branch and the other was connected to a 2-wire branch. Both of these had to be off for the voltage to return to normal. At the request of the customer, these findings were not investigated further.
I installed a ground jumper (a length of 12 guage) and connected it back to the service and used it to measure for potential differences on various points of the trailer skin and frame. None found.
When all was said and done, I had recommended that the cable company ground their system directly to the service ground at the pole next to the trailer as the phone company had done.
Brain trust, what say you.
:smile:
They also said they were getting shocked when trying to connect their equipment to the side of the home (metal skin), and an associated ground which was attached to the trailer frame.
I attempted to measure the same way they did with no results, but had readings from 2 to 7 volts when measured to the shield.
Found the proper 4 wire feed installed via overhead connection to a post mount service adjacent to the home.
The only abnormal voltage readings I had were these:
All circuits on:
Line 1: 114 V
Line 2: 132 V
Turn on and off various circuits an found two circuits that, when both were "off", brought the voltages back to normal:
Line 1: 123 V
Line 2: 123 V
One circuit was connected to a multi-wire branch and the other was connected to a 2-wire branch. Both of these had to be off for the voltage to return to normal. At the request of the customer, these findings were not investigated further.
I installed a ground jumper (a length of 12 guage) and connected it back to the service and used it to measure for potential differences on various points of the trailer skin and frame. None found.
When all was said and done, I had recommended that the cable company ground their system directly to the service ground at the pole next to the trailer as the phone company had done.
Brain trust, what say you.
:smile:
Too bad owners didn't let you proceed but during these times the cash flow problem can be understood.