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: This is easy to check. You want to examine the electrician's wiring for
: type (ie., THHN, THWN-2, etc. and stranded, not solid copper
: conductors) and size. Hot Springs MINIMUM wire recommendations are
: stranded wire rated at 75 C or higher of the appropriate wire size.
: The actual wire size selected by the electrician is based on many
: factors such as length of wire run, highest ambient temperatures
: encountered, etc. Electrician's will frequently goof and install a 60
: C rated wire such as UF or NM-B because it is cheaper and they
: generally have plenty of it on their truck. Such wire does not
: generally have the requisite ampacity and is generally solid copper
: rather than stranded. The terminal block, which is spring loaded,
: cannot get as good a connection to solid copper as it can with
: stranded copper. Another big goof to watch for is the use of aluminum
: wire which will cause the same issue due to incompatibility with the
: terminal block.
: A load/no load test is performed with a voltmeter. Take a no load
: voltage test of the circuit first as a point of reference. This is
: done by immediately reading the voltage when power is first applied,
: but before any motors or the heater is running. Once you establish
: that parameter, turn everything on (pump or pumps and the heater) and
: retake your voltage measurements. It is normal for the voltage to
: drop a bit under full load as compared to the no load reading. A good
: circuit only drops about 2 percent maximum under full load. If you
: start with a no load reading of 240 volts, the voltage on a good
: circuit may drop to approximately 235 or 236 volts. Any drop beyond
: that indicates problems in the circuit. There are many causes of
: excess voltage drop. Some common reasons are incorrect wire sizing by
: the electrician, a maxed out house service and/or power distribution
: problems from your electric company (ie. poor service on street, bad
: nearby transformer, etc.).
: Different brands of tubs specify differing levels of acceptable voltage
: drop. As I said, HS specifies 3 percent max.
John, ok, but....what does "75 C" mean? 75 Centigrade? Also, what does
THHN, THWN-2 mean? What gauge SHOULD the wire be?
PLEASE NOTE: We are Roberts Hot Tubs Inc. (manufacturers of traditional wooden hot tubs)! If you found this webpage through a search engine while searching for a different brand of spa, we are not them! We simply appeared in your search due to that name being talked about on this particular web page. The phone number below will reach Roberts Hot Tubs, not the manufacturer of the brand of spa you're searching for. This is a public forum and you're more than welcome to post a question asking for contact or other information for a particular brand of spa. Almost certainly someone will be able to assist you.